controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/ConstructorElement.kt

@@ -32,7 +32,7 @@ public class StateConstructorElement<T>(
     public val state: DeviceState<T>,
 ) : ConstructorElement
 
-public class ConnectionConstrucorElement(
+public class ConnectionConstructorElement(
     public val reads: Collection<DeviceState<*>>,
     public val writes: Collection<DeviceState<*>>,
 ) : ConstructorElement
@@ -58,7 +58,7 @@ public interface StateContainer : ContextAware, CoroutineScope {
         reads: Collection<DeviceState<*>> = emptySet(),
         onChange: suspend (T) -> Unit,
     ): Job = valueFlow.onEach(onChange).launchIn(this@StateContainer).also {
-        registerElement(ConnectionConstrucorElement(reads + this, writes))
+        registerElement(ConnectionConstructorElement(reads + this, writes))
     }
 
     public fun <T> DeviceState<T>.onChange(
@@ -72,7 +72,7 @@ public interface StateContainer : ContextAware, CoroutineScope {
             onChange(pair.first, pair.second)
         }
     }.launchIn(this@StateContainer).also {
-        registerElement(ConnectionConstrucorElement(reads + this, writes))
+        registerElement(ConnectionConstructorElement(reads + this, writes))
     }
 }
 
@@ -164,7 +164,7 @@ public fun <T1, T2, R> StateContainer.combineState(
  * On resulting [Job] cancel the binding is unregistered
  */
 public fun <T> StateContainer.bind(sourceState: DeviceState<T>, targetState: MutableDeviceState<T>): Job {
-    val descriptor = ConnectionConstrucorElement(setOf(sourceState), setOf(targetState))
+    val descriptor = ConnectionConstructorElement(setOf(sourceState), setOf(targetState))
     registerElement(descriptor)
     return sourceState.valueFlow.onEach {
         targetState.value = it
@@ -186,7 +186,7 @@ public fun <T, R> StateContainer.transformTo(
     targetState: MutableDeviceState<R>,
     transformation: suspend (T) -> R,
 ): Job {
-    val descriptor = ConnectionConstrucorElement(setOf(sourceState), setOf(targetState))
+    val descriptor = ConnectionConstructorElement(setOf(sourceState), setOf(targetState))
     registerElement(descriptor)
     return sourceState.valueFlow.onEach {
         targetState.value = transformation(it)
@@ -208,7 +208,7 @@ public fun <T1, T2, R> StateContainer.combineTo(
     targetState: MutableDeviceState<R>,
     transformation: suspend (T1, T2) -> R,
 ): Job {
-    val descriptor = ConnectionConstrucorElement(setOf(sourceState1, sourceState2), setOf(targetState))
+    val descriptor = ConnectionConstructorElement(setOf(sourceState1, sourceState2), setOf(targetState))
     registerElement(descriptor)
     return kotlinx.coroutines.flow.combine(sourceState1.valueFlow, sourceState2.valueFlow, transformation).onEach {
         targetState.value = it
@@ -229,7 +229,7 @@ public inline fun <reified T, R> StateContainer.combineTo(
     targetState: MutableDeviceState<R>,
     noinline transformation: suspend (Array<T>) -> R,
 ): Job {
-    val descriptor = ConnectionConstrucorElement(sourceStates, setOf(targetState))
+    val descriptor = ConnectionConstructorElement(sourceStates, setOf(targetState))
     registerElement(descriptor)
     return kotlinx.coroutines.flow.combine(sourceStates.map { it.valueFlow }, transformation).onEach {
         targetState.value = it

controls-core/src/commonMain/kotlin/space/kscience/controls/api/descriptors.kt

@@ -4,34 +4,109 @@ import kotlinx.serialization.Serializable
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.MetaDescriptorBuilder
 
-//TODO add proper builders
+//TODO check proper builders
 
 /**
- * A descriptor for property
+ * A descriptor for a property
  */
 @Serializable
 public class PropertyDescriptor(
     public val name: String,
-    public var description: String? = null,
+    public val description: String? = null,
-    public var metaDescriptor: MetaDescriptor = MetaDescriptor(),
+    public val metaDescriptor: MetaDescriptor = MetaDescriptor(),
-    public var readable: Boolean = true,
+    public val readable: Boolean = true,
-    public var mutable: Boolean = false,
+    public val mutable: Boolean = false,
 )
 
-public fun PropertyDescriptor.metaDescriptor(block: MetaDescriptorBuilder.() -> Unit) {
+/**
-    metaDescriptor = MetaDescriptor {
+ * A builder for PropertyDescriptor
-        from(metaDescriptor)
+ */
-        block()
+public class PropertyDescriptorBuilder(public val name: String) {
+    public var description: String? = null
+    public var metaDescriptor: MetaDescriptor = MetaDescriptor()
+    public var readable: Boolean = true
+    public var mutable: Boolean = false
+
+    /**
+     * Configure the metaDescriptor using a block
+     */
+    public fun metaDescriptor(block: MetaDescriptorBuilder.() -> Unit) {
+        metaDescriptor = MetaDescriptor {
+            from(metaDescriptor)
+            block()
+        }
     }
+
+    /**
+     * Build the PropertyDescriptor
+     */
+    public fun build(): PropertyDescriptor = PropertyDescriptor(
+        name = name,
+        description = description,
+        metaDescriptor = metaDescriptor,
+        readable = readable,
+        mutable = mutable
+    )
 }
 
 /**
- * A descriptor for property
+ * Create a PropertyDescriptor using a builder
+ */
+public fun propertyDescriptor(name: String, builder: PropertyDescriptorBuilder.() -> Unit = {}): PropertyDescriptor =
+    PropertyDescriptorBuilder(name).apply(builder).build()
+
+/**
+ * A descriptor for an action
  */
 @Serializable
 public class ActionDescriptor(
     public val name: String,
-    public var description: String? = null,
+    public val description: String? = null,
-    public var inputMetaDescriptor: MetaDescriptor = MetaDescriptor(),
+    public val inputMetaDescriptor: MetaDescriptor = MetaDescriptor(),
-    public var outputMetaDescriptor: MetaDescriptor = MetaDescriptor()
+    public val outputMetaDescriptor: MetaDescriptor = MetaDescriptor(),
 )
+
+/**
+ * A builder for ActionDescriptor
+ */
+public class ActionDescriptorBuilder(public val name: String) {
+    public var description: String? = null
+    public var inputMetaDescriptor: MetaDescriptor = MetaDescriptor()
+    public var outputMetaDescriptor: MetaDescriptor = MetaDescriptor()
+
+    /**
+     * Configure the inputMetaDescriptor using a block
+     */
+    public fun inputMeta(block: MetaDescriptorBuilder.() -> Unit) {
+        inputMetaDescriptor = MetaDescriptor {
+            from(inputMetaDescriptor)
+            block()
+        }
+    }
+
+    /**
+     * Configure the outputMetaDescriptor using a block
+     */
+    public fun outputMeta(block: MetaDescriptorBuilder.() -> Unit) {
+        outputMetaDescriptor = MetaDescriptor {
+            from(outputMetaDescriptor)
+            block()
+        }
+    }
+
+    /**
+     * Build the ActionDescriptor
+     */
+    public fun build(): ActionDescriptor = ActionDescriptor(
+        name = name,
+        description = description,
+        inputMetaDescriptor = inputMetaDescriptor,
+        outputMetaDescriptor = outputMetaDescriptor
+    )
+}
+
+/**
+ * Create an ActionDescriptor using a builder
+ */
+public fun actionDescriptor(name: String, builder: ActionDescriptorBuilder.() -> Unit = {}): ActionDescriptor =
+    ActionDescriptorBuilder(name).apply(builder).build()

controls-core/src/commonMain/kotlin/space/kscience/controls/spec/CompositeControlComponents.kt

@@ -0,0 +1,809 @@
+package space.kscience.controls.spec
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineName
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancelAndJoin
+import kotlinx.coroutines.channels.BufferOverflow
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.withTimeoutOrNull
+import space.kscience.controls.api.*
+import space.kscience.dataforge.context.Context
+import space.kscience.dataforge.context.error
+import space.kscience.dataforge.context.logger
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MetaConverter
+import space.kscience.dataforge.meta.MutableMeta
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.asName
+import space.kscience.dataforge.names.parseAsName
+import space.kscience.dataforge.names.plus
+import kotlin.properties.PropertyDelegateProvider
+import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
+import kotlin.time.Duration
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.filterIsInstance
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.launchIn
+import space.kscience.dataforge.context.AbstractPlugin
+import space.kscience.dataforge.context.ContextAware
+import space.kscience.dataforge.context.ContextBuilder
+import space.kscience.dataforge.context.PluginFactory
+import space.kscience.dataforge.context.PluginTag
+
+/**
+ * Defines how child device lifecycle should be managed.
+ */
+public enum class LifecycleMode {
+    /**
+     * Device starts and stops with parent
+     */
+    LINKED,
+
+    /**
+     * Device is started and stopped independently
+     */
+    INDEPENDENT,
+
+    /**
+     * Device is created but starts only when explicitly requested
+     */
+    LAZY
+}
+
+public sealed class DeviceChangeEvent {
+    public abstract val deviceName: Name
+
+    public data class Added(override val deviceName: Name, val device: Device) : DeviceChangeEvent()
+    public data class Removed(override val deviceName: Name) : DeviceChangeEvent()
+}
+
+public interface ComponentRegistry : ContextAware {
+    public fun <D: ConfigurableCompositeControlComponent<*>> getSpec(name: Name): CompositeControlComponentSpec<D>?
+}
+
+public class ComponentRegistryManager : AbstractPlugin(), ComponentRegistry {
+    private val specs = mutableMapOf<Name, CompositeControlComponentSpec<*>>()
+
+    override val tag: PluginTag = Companion.tag
+
+    override fun <D : ConfigurableCompositeControlComponent<*>> getSpec(name: Name): CompositeControlComponentSpec<D>? {
+        try {
+            return specs[name] as? CompositeControlComponentSpec<D>
+        } catch (e: ClassCastException) {
+            logger.error(e) { "Failed to get spec $name" }
+        }
+        return null
+    }
+
+    public fun registerSpec(spec: CompositeControlComponentSpec<*>) {
+        specs[(spec as DevicePropertySpec<*, *>).name.asName()] = spec
+    }
+
+    public companion object : PluginFactory<ComponentRegistryManager> {
+        override val tag: PluginTag = PluginTag("controls.spechub", group = PluginTag.DATAFORGE_GROUP)
+
+        override fun build(context: Context, meta: Meta): ComponentRegistryManager = ComponentRegistryManager()
+
+    }
+}
+public val Context.componentRegistry: ComponentRegistry? get() = plugins[ComponentRegistryManager]
+
+public fun ContextBuilder.withSpecHub() {
+    plugin(ComponentRegistryManager)
+}
+
+/**
+ * Builder for [DeviceLifecycleConfig].
+ */
+public class DeviceLifecycleConfigBuilder {
+    public var lifecycleMode: LifecycleMode = LifecycleMode.LINKED
+    public var messageBuffer: Int = 1000
+    public var startDelay: Duration = Duration.ZERO
+    public var startTimeout: Duration? = null
+    public var stopTimeout: Duration? = null
+    public var coroutineScope: CoroutineScope? = null
+    public var dispatcher: CoroutineDispatcher? = null
+    public var onError: ChildDeviceErrorHandler = ChildDeviceErrorHandler.RESTART
+
+    public fun build(): DeviceLifecycleConfig = DeviceLifecycleConfig(
+        lifecycleMode, messageBuffer, startDelay, startTimeout, stopTimeout, coroutineScope, dispatcher, onError
+    )
+}
+
+public fun DeviceLifecycleConfigBuilder.linked() {
+    lifecycleMode = LifecycleMode.LINKED
+}
+
+public fun DeviceLifecycleConfigBuilder.independent() {
+    lifecycleMode = LifecycleMode.INDEPENDENT
+}
+
+public fun DeviceLifecycleConfigBuilder.lazy() {
+    lifecycleMode = LifecycleMode.LAZY
+}
+
+public fun DeviceLifecycleConfigBuilder.restartOnError() {
+    onError = ChildDeviceErrorHandler.RESTART
+}
+
+public fun DeviceLifecycleConfigBuilder.propagateError() {
+    onError = ChildDeviceErrorHandler.PROPAGATE
+}
+
+public fun DeviceLifecycleConfigBuilder.withCustomTimeout(timeout: Duration) {
+    startTimeout = timeout
+    stopTimeout = timeout
+}
+
+@OptIn(InternalDeviceAPI::class)
+public abstract class CompositeControlComponentSpec<D : Device>() : CompositeDeviceSpec<D> {
+
+    private val _properties = hashMapOf<String, DevicePropertySpec<D, *>>(
+        DeviceMetaPropertySpec.name to DeviceMetaPropertySpec
+    )
+
+    override val properties: Map<String, DevicePropertySpec<D, *>> get() = _properties
+
+    private val _actions = hashMapOf<String, DeviceActionSpec<D, *, *>>()
+
+    override val actions: Map<String, DeviceActionSpec<D, *, *>> get() = _actions
+
+    private val _childSpecs = mutableMapOf<String, ChildComponentConfig<*>>()
+
+    override val childSpecs: Map<String, ChildComponentConfig<*>> get() = _childSpecs
+
+    public fun <CDS: CompositeControlComponentSpec<CD>, CD: ConfigurableCompositeControlComponent<CD>> childSpec(
+        deviceName: String? = null,
+        specName: Name? = null,
+        metaBuilder: (MutableMeta.() -> Unit)? = null,
+        configBuilder: DeviceLifecycleConfigBuilder.() -> Unit = {},
+    ): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, CompositeControlComponentSpec<CD>>> =
+        PropertyDelegateProvider { thisRef, property ->
+            ReadOnlyProperty { _, _ ->
+                val childSpecName = specName ?: property.name.asName()
+                val nameForDevice = deviceName?.asName() ?: property.name.asName()
+                val config = DeviceLifecycleConfigBuilder().apply(configBuilder).build()
+                val meta = metaBuilder?.let { Meta(it) }
+                val spec = (thisRef as ConfigurableCompositeControlComponent<*>).context.componentRegistry?.getSpec<CD>(childSpecName) ?: error("Spec with name '$specName' is not found")
+                val childComponentConfig = object : ChildComponentConfig<CD>{
+                    override val spec: CompositeControlComponentSpec<CD> = spec
+                    override val config: DeviceLifecycleConfig = config
+                    override val meta: Meta? = meta
+                    override val name: Name = nameForDevice
+                }
+                _childSpecs[property.name] = childComponentConfig
+                childComponentConfig.spec
+            }
+        }
+
+    override fun validate(device: D) {
+        properties.map { it.value.descriptor }.forEach { specProperty ->
+            check(specProperty in device.propertyDescriptors) { "Property ${specProperty.name} not registered in ${device.id}" }
+        }
+        actions.map { it.value.descriptor }.forEach { specAction ->
+            check(specAction in device.actionDescriptors) { "Action ${specAction.name} not registered in ${device.id}" }
+        }
+    }
+
+    override fun <T, P : DevicePropertySpec<D, T>> registerProperty(deviceProperty: P): P {
+        _properties[deviceProperty.name] = deviceProperty
+        return deviceProperty
+    }
+
+    override fun <I, O> registerAction(deviceAction: DeviceActionSpec<D, I, O>): DeviceActionSpec<D, I, O> {
+        _actions[deviceAction.name] = deviceAction
+        return deviceAction
+    }
+
+    override fun createPropertyDescriptorInternal(
+        propertyName: String,
+        converter: MetaConverter<*>,
+        mutable: Boolean,
+        property: KProperty<*>,
+        descriptorBuilder: PropertyDescriptorBuilder.() -> Unit,
+    ): PropertyDescriptor {
+        return propertyDescriptor(propertyName) {
+            this.mutable = mutable
+            converter.descriptor?.let { converterDescriptor ->
+                metaDescriptor {
+                    from(converterDescriptor)
+                }
+            }
+            fromSpec(property)
+            descriptorBuilder()
+        }
+    }
+
+    override fun createActionDescriptor(
+        actionName: String,
+        inputConverter: MetaConverter<*>,
+        outputConverter: MetaConverter<*>,
+        property: KProperty<*>,
+        descriptorBuilder: ActionDescriptorBuilder.() -> Unit,
+    ): ActionDescriptor {
+        return actionDescriptor(actionName) {
+            inputConverter.descriptor?.let { converterDescriptor ->
+                inputMeta {
+                    from(converterDescriptor)
+                }
+            }
+            outputConverter.descriptor?.let { converterDescriptor ->
+                outputMeta {
+                    from(converterDescriptor)
+                }
+            }
+            fromSpec(property)
+            descriptorBuilder()
+        }
+    }
+
+    override fun <T> property(
+        converter: MetaConverter<T>,
+        descriptorBuilder: PropertyDescriptorBuilder.() -> Unit,
+        name: String?,
+        read: suspend D.(propertyName: String) -> T?,
+    ): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, T>>> =
+        PropertyDelegateProvider { _: CompositeControlComponentSpec<D>, property ->
+            val propertyName = name ?: property.name
+            val descriptor = createPropertyDescriptorInternal(
+                propertyName = propertyName,
+                converter = converter,
+                mutable = false,
+                property = property,
+                descriptorBuilder = descriptorBuilder
+            )
+            val deviceProperty = registerProperty(object : DevicePropertySpec<D, T> {
+                override val descriptor = descriptor
+                override val converter = converter
+
+                override suspend fun read(device: D): T? =
+                    withContext(device.coroutineContext) { device.read(propertyName) }
+            })
+            ReadOnlyProperty { _, _ ->
+                deviceProperty
+            }
+        }
+
+
+    override fun <T> mutableProperty(
+        converter: MetaConverter<T>,
+        descriptorBuilder: PropertyDescriptorBuilder.() -> Unit,
+        name: String?,
+        read: suspend D.(propertyName: String) -> T?,
+        write: suspend D.(propertyName: String, value: T) -> Unit
+    ): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, T>>> =
+        PropertyDelegateProvider { _: CompositeControlComponentSpec<D>, property ->
+            val propertyName = name ?: property.name
+            val descriptor = createPropertyDescriptorInternal(
+                propertyName = propertyName,
+                converter = converter,
+                mutable = true,
+                property = property,
+                descriptorBuilder = descriptorBuilder
+            )
+            val deviceProperty = registerProperty(object : MutableDevicePropertySpec<D, T> {
+                override val descriptor = descriptor
+                override val converter = converter
+                override suspend fun read(device: D): T? =
+                    withContext(device.coroutineContext) { device.read(propertyName) }
+
+                override suspend fun write(device: D, value: T): Unit = withContext(device.coroutineContext) {
+                    device.write(propertyName, value)
+                }
+            })
+            ReadOnlyProperty { _, _ ->
+                deviceProperty
+            }
+        }
+
+
+    override fun <I, O> action(
+        inputConverter: MetaConverter<I>,
+        outputConverter: MetaConverter<O>,
+        descriptorBuilder: ActionDescriptorBuilder.() -> Unit,
+        name: String?,
+        execute: suspend D.(I) -> O,
+    ): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DeviceActionSpec<D, I, O>>> =
+        PropertyDelegateProvider { _: CompositeControlComponentSpec<D>, property ->
+            val actionName = name ?: property.name
+            val descriptor = createActionDescriptor(
+                actionName = actionName,
+                inputConverter = inputConverter,
+                outputConverter = outputConverter,
+                property = property,
+                descriptorBuilder = descriptorBuilder
+            )
+            val deviceAction = registerAction(object : DeviceActionSpec<D, I, O> {
+                override val descriptor = descriptor
+                override val inputConverter = inputConverter
+                override val outputConverter = outputConverter
+                override suspend fun execute(device: D, input: I): O = withContext(device.coroutineContext) {
+                    device.execute(input)
+                }
+            })
+
+            ReadOnlyProperty { _, _ ->
+                deviceAction
+            }
+        }
+
+    override suspend fun D.onOpen() {}
+    override suspend fun D.onClose() {}
+
+}
+
+public fun <D : Device> CompositeControlComponentSpec<D>.unitAction(
+    descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    execute: suspend D.() -> Unit,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DeviceActionSpec<D, Unit, Unit>>> =
+    action(
+        MetaConverter.unit,
+        MetaConverter.unit,
+        descriptorBuilder,
+        name
+    ) {
+        execute()
+    }
+
+
+public fun <D : Device> CompositeControlComponentSpec<D>.metaAction(
+    descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    execute: suspend D.(Meta) -> Meta,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DeviceActionSpec<D, Meta, Meta>>> =
+    action(
+        MetaConverter.meta,
+        MetaConverter.meta,
+        descriptorBuilder,
+        name
+    ) {
+        execute(it)
+    }
+
+/**
+ *  Basic interface for device description
+ */
+public interface CompositeDeviceSpec<D : Device> {
+    public val properties: Map<String, DevicePropertySpec<D, *>>
+
+    public val actions: Map<String, DeviceActionSpec<D, *, *>>
+
+    public val childSpecs: Map<String, ChildComponentConfig<*>>
+
+    /**
+     *  Called on `start()`
+     */
+    public suspend fun D.onOpen()
+
+    /**
+     * Called on `stop()`
+     */
+    public suspend fun D.onClose()
+
+    /**
+     * Registers a property in the spec.
+     */
+    public fun <T, P : DevicePropertySpec<D, T>> registerProperty(deviceProperty: P): P
+
+    /**
+     * Registers an action in the spec.
+     */
+    public fun <I, O> registerAction(deviceAction: DeviceActionSpec<D, I, O>): DeviceActionSpec<D, I, O>
+
+    public fun validate(device: D)
+
+    public fun createPropertyDescriptorInternal(
+        propertyName: String,
+        converter: MetaConverter<*>,
+        mutable: Boolean,
+        property: KProperty<*>,
+        descriptorBuilder: PropertyDescriptorBuilder.() -> Unit
+    ): PropertyDescriptor
+
+    public fun createActionDescriptor(
+        actionName: String,
+        inputConverter: MetaConverter<*>,
+        outputConverter: MetaConverter<*>,
+        property: KProperty<*>,
+        descriptorBuilder: ActionDescriptorBuilder.() -> Unit
+    ): ActionDescriptor
+
+    public fun <T> property(
+        converter: MetaConverter<T>,
+        descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+        name: String? = null,
+        read: suspend D.(propertyName: String) -> T?,
+    ): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, T>>>
+
+    public fun <T> mutableProperty(
+        converter: MetaConverter<T>,
+        descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+        name: String? = null,
+        read: suspend D.(propertyName: String) -> T?,
+        write: suspend D.(propertyName: String, value: T) -> Unit,
+    ): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, T>>>
+
+    public fun <I, O> action(
+        inputConverter: MetaConverter<I>,
+        outputConverter: MetaConverter<O>,
+        descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
+        name: String? = null,
+        execute: suspend D.(I) -> O,
+    ): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DeviceActionSpec<D, I, O>>>
+}
+
+public data class DeviceLifecycleConfig(
+    val lifecycleMode: LifecycleMode = LifecycleMode.LINKED,
+    val messageBuffer: Int = 1000,
+    val startDelay: Duration = Duration.ZERO,
+    val startTimeout: Duration? = null,
+    val stopTimeout: Duration? = null,
+    val coroutineScope: CoroutineScope? = null,
+    val dispatcher: CoroutineDispatcher? = null,
+    val onError: ChildDeviceErrorHandler = ChildDeviceErrorHandler.RESTART
+) {
+    init {
+        require(messageBuffer > 0) { "Message buffer size must be positive." }
+        startTimeout?.let { require(it.isPositive()) { "Start timeout must be positive." } }
+        stopTimeout?.let { require(it.isPositive()) { "Stop timeout must be positive." } }
+    }
+}
+
+public enum class ChildDeviceErrorHandler {
+    IGNORE,
+    RESTART,
+    STOP_PARENT,
+    PROPAGATE
+}
+
+/**
+ * Base class for managing child devices. Manages lifecycle and message flow.
+ */
+public abstract class AbstractDeviceHubManager(
+    public val context: Context,
+    private val dispatcher: CoroutineDispatcher = Dispatchers.Default,
+) {
+    internal val childrenJobs: MutableMap<Name, ChildJob> = mutableMapOf()
+    public val devices: Map<Name, Device> get() = childrenJobs.mapValues { it.value.device }
+
+    internal data class ChildJob(
+        val device: Device,
+        val job: Job,
+        val lifecycleMode: LifecycleMode,
+        val messageBus: MutableSharedFlow<DeviceMessage>,
+        val meta: Meta? = null
+    )
+
+    /**
+     * A centralized bus for messages
+     */
+    public abstract val messageBus: MutableSharedFlow<DeviceMessage>
+
+    /**
+     * A centralized bus for device change events
+     */
+    public abstract val deviceChanges: MutableSharedFlow<DeviceChangeEvent>
+
+
+    /**
+     * Launches a child device with a specific lifecycle mode and error handling.
+     */
+    @OptIn(ExperimentalCoroutinesApi::class)
+    internal fun launchChild(name: Name, device: Device, config: DeviceLifecycleConfig, meta: Meta? = null): ChildJob {
+        val childMessageBus = MutableSharedFlow<DeviceMessage>(
+            replay = config.messageBuffer,
+            onBufferOverflow = BufferOverflow.DROP_OLDEST
+        )
+        val childScope = config.coroutineScope ?: context
+        val job = childScope.launch(dispatcher + CoroutineName("Child device $name")) {
+            try {
+                if (config.lifecycleMode != LifecycleMode.INDEPENDENT) {
+                    if (config.lifecycleMode == LifecycleMode.LINKED || device.lifecycleState == LifecycleState.STARTING){
+                        delay(config.startDelay)
+                        withTimeoutOrNull(config.startTimeout ?: Duration.INFINITE) {
+                            device.start()
+                        } ?: error("Timeout on start for $name")
+                    }
+                }
+
+                device.messageFlow.collect { message ->
+                    childMessageBus.emit(message.changeSource { name.plus(it) })
+                    messageBus.emit(message.changeSource { name.plus(it) })
+                }
+            } catch (ex: Exception) {
+                val errorMessage = DeviceMessage.error(ex, name)
+                messageBus.emit(errorMessage)
+
+                when (config.onError) {
+                    ChildDeviceErrorHandler.IGNORE -> context.logger.error(ex) { "Error in child device $name ignored" }
+                    ChildDeviceErrorHandler.RESTART -> {
+                        context.logger.error(ex) { "Error in child device $name, restarting" }
+                        removeDevice(name)
+                        childrenJobs[name] = launchChild(name, device, config, meta)
+                    }
+                    ChildDeviceErrorHandler.STOP_PARENT -> {
+                        context.logger.error(ex) { "Error in child device $name, stopping parent" }
+                        coroutineContext[Job]?.cancelAndJoin()
+                    }
+                    ChildDeviceErrorHandler.PROPAGATE -> {
+                        context.logger.error(ex) { "Error in child device $name propagated to parent" }
+                        throw ex
+                    }
+                }
+            } finally {
+                childrenJobs.remove(name)
+                clearReplayCache(childMessageBus)
+                deviceChanges.emit(DeviceChangeEvent.Removed(name))
+                messageBus.emit(DeviceLogMessage("Device $name stopped", sourceDevice = name))
+                if (device is ConfigurableCompositeControlComponent<*>) {
+                    device.onChildStop()
+                }
+            }
+        }
+        return ChildJob(device, job, config.lifecycleMode, childMessageBus, meta)
+    }
+
+    @OptIn(ExperimentalCoroutinesApi::class)
+    private fun <T> clearReplayCache(mutableSharedFlow: MutableSharedFlow<T>){
+        val cached = mutableSharedFlow.replayCache
+        mutableSharedFlow.resetReplayCache()
+        cached.forEach { mutableSharedFlow.tryEmit(it) }
+    }
+
+    /**
+     * Add a device to the hub and manage its lifecycle according to its spec
+     */
+    public fun addDevice(name: Name, device: Device, config: DeviceLifecycleConfig, meta: Meta? = null) {
+        val existingDevice = devices[name]
+        if (existingDevice != null) {
+            if(existingDevice == device) {
+                error("Device with name $name is already installed")
+            }
+            context.launch(device.coroutineContext) { existingDevice.stopWithTimeout(config.stopTimeout ?: Duration.INFINITE) }
+        }
+        childrenJobs[name] = launchChild(name, device, config, meta)
+
+        context.launch {
+            deviceChanges.emit(DeviceChangeEvent.Added(name, device))
+            messageBus.emit(DeviceLogMessage("Device $name added", sourceDevice = name))
+        }
+    }
+
+    public fun removeDevice(name: Name) {
+        childrenJobs[name]?.let { childJob ->
+            context.launch(childJob.device.coroutineContext) {
+                val timeout = when (childJob.lifecycleMode) {
+                    LifecycleMode.INDEPENDENT -> childJob.device.meta["stopTimeout".asName()]?.value?.let {
+                        Duration.parse(it.toString())
+                    } ?: Duration.INFINITE
+
+                    else -> Duration.INFINITE
+                }
+                withTimeoutOrNull(timeout) {
+                    childJob.job.cancelAndJoin()
+                    childJob.device.stop()
+                } ?: error("Timeout on stop for $name")
+            }
+            childrenJobs.remove(name)
+            context.launch {
+                messageBus.emit(DeviceLogMessage("Device $name removed", sourceDevice = name))
+                deviceChanges.emit(DeviceChangeEvent.Removed(name))
+            }
+        }
+    }
+
+    /**
+     * Change lifecycle mode of a child device
+     */
+    public fun changeLifecycleMode(name: Name, mode: LifecycleMode) {
+        val job = childrenJobs[name] ?: error("Device with name '$name' is not found")
+        val config = DeviceLifecycleConfig(lifecycleMode = mode, messageBuffer = job.messageBus.replayCache.size)
+        context.launch {
+            job.job.cancelAndJoin()
+            childrenJobs[name] = launchChild(name, job.device, config, job.meta)
+        }
+    }
+
+    /**
+     * Get local message bus for a child device
+     */
+    public fun getChildMessageBus(name: Name) : MutableSharedFlow<DeviceMessage>? = childrenJobs[name]?.messageBus
+
+    /**
+     * Method for explicit call when child device is stopped.
+     */
+    internal open fun onChildStop(){
+
+    }
+}
+
+
+private class DeviceHubManagerImpl(context: Context, dispatcher: CoroutineDispatcher = Dispatchers.Default) : AbstractDeviceHubManager(context, dispatcher){
+    override val messageBus: MutableSharedFlow<DeviceMessage> = MutableSharedFlow(
+        replay = 1000,
+        onBufferOverflow = BufferOverflow.DROP_OLDEST
+    )
+    override val deviceChanges: MutableSharedFlow<DeviceChangeEvent> = MutableSharedFlow(replay = 1)
+}
+
+/**
+ * An interface for a device that contains other devices as children.
+ */
+public interface CompositeControlComponent : Device {
+    /**
+     * A centralized flow of all device messages from this node and all its children
+     */
+    public val messageBus: SharedFlow<DeviceMessage>
+
+    /**
+     * A map of child devices
+     */
+    public val devices: Map<Name, Device>
+}
+
+/**
+ * A base class for devices created from specification, using AbstractDeviceHubManager for children management
+ */
+public open class ConfigurableCompositeControlComponent<D : Device>(
+    public open val spec: CompositeControlComponentSpec<D>,
+    context: Context,
+    meta: Meta = Meta.EMPTY,
+    config: DeviceLifecycleConfig = DeviceLifecycleConfig(),
+    private val hubManager: AbstractDeviceHubManager = DeviceHubManagerImpl(context, config.dispatcher ?: Dispatchers.Default),
+) : DeviceBase<D>(context, meta), CompositeControlComponent {
+
+    override val properties: Map<String, DevicePropertySpec<D, *>>
+        get() = spec.properties
+
+    override val actions: Map<String, DeviceActionSpec<D, *, *>>
+        get() = spec.actions
+
+    final override val messageBus: MutableSharedFlow<DeviceMessage>
+        get() = hubManager.messageBus
+
+    public val deviceChanges: MutableSharedFlow<DeviceChangeEvent>
+        get() = hubManager.deviceChanges
+
+    public val aggregatedMessageFlow: SharedFlow<DeviceMessage>
+        get() = hubManager.messageBus
+
+    init {
+        spec.childSpecs.forEach{ (name, childSpec) ->
+            val childDevice = ConfigurableCompositeControlComponent(childSpec.spec, context, childSpec.meta ?: Meta.EMPTY, childSpec.config)
+            addDevice(childSpec.name, childDevice, childSpec.config, childSpec.meta)
+        }
+
+        spec.actions.values.forEach { actionSpec ->
+            launch {
+                val actionName = actionSpec.name
+                messageFlow.filterIsInstance<ActionExecuteMessage>().filter { it.action == actionName }.onEach {
+                    val result = execute(actionName, it.argument)
+                    messageBus.emit(
+                        ActionResultMessage(
+                            action = actionName,
+                            result = result,
+                            requestId = it.requestId,
+                            sourceDevice = id.asName()
+                        )
+                    )
+                }.launchIn(this)
+            }
+        }
+    }
+
+    override suspend fun onStart() {
+        with(spec) {
+            self.onOpen()
+            validate(self)
+        }
+        hubManager.devices.values.filter {
+            it.lifecycleState != LifecycleState.STARTED && it.lifecycleState != LifecycleState.STARTING
+        }.forEach {
+            if (hubManager.childrenJobs[it.id.parseAsName()]?.lifecycleMode != LifecycleMode.LAZY) {
+                it.start()
+            }
+        }
+    }
+
+    private suspend fun getTimeout(device: Device): Duration {
+        return (hubManager.childrenJobs[device.id.parseAsName()]?.lifecycleMode ?:  LifecycleMode.LINKED).let{
+            if(it == LifecycleMode.INDEPENDENT)
+                it.name.let{ meta["stopTimeout".parseAsName()]?.let { durationMeta ->
+                    Duration.parse(durationMeta.value.toString())
+                } ?: Duration.INFINITE }
+            else Duration.INFINITE
+        }
+    }
+
+    override suspend fun onStop() {
+        hubManager.devices.values.forEach {
+            launch(it.coroutineContext){
+                withTimeoutOrNull(getTimeout(it)){
+                    it.stop()
+                }
+            }
+        }
+        with(spec) {
+            self.onClose()
+        }
+    }
+
+    override fun toString(): String = "Device(spec=$spec)"
+
+    internal open fun onChildStop() {
+    }
+
+    /**
+     * Add existing device to this hub
+     */
+    private fun addDevice(name: Name = device.id.asName(), device: Device, config: DeviceLifecycleConfig = DeviceLifecycleConfig(), meta: Meta? = null) {
+        hubManager.addDevice(name, device, config, meta)
+    }
+
+    /**
+     * Remove a child device from the hub by name.
+     */
+    private fun removeDevice(name: Name) {
+        hubManager.removeDevice(name)
+    }
+
+    /**
+     * Get list of all children devices
+     */
+    public override val devices: Map<Name, Device>
+        get() = hubManager.devices
+
+    /**
+     * Get child device from this hub by name
+     */
+    public fun <CD : ConfigurableCompositeControlComponent<CD>> getChildDevice(name: Name): ConfigurableCompositeControlComponent<CD> =
+        hubManager.devices[name] as? ConfigurableCompositeControlComponent<CD>? ?: error("Device $name not found")
+
+    public fun <CD: ConfigurableCompositeControlComponent<CD>> childDevice(name: Name? = null):
+            PropertyDelegateProvider<ConfigurableCompositeControlComponent<D>, ReadOnlyProperty<ConfigurableCompositeControlComponent<D>, CD>>
+            = PropertyDelegateProvider{ thisRef, property ->
+        ReadOnlyProperty{ _, _ ->
+            val deviceName = name ?: property.name.asName()
+            thisRef.devices[deviceName] as? CD ?: error("Device $deviceName not found")
+        }
+    }
+
+    /**
+     * Get child device message bus by name
+     */
+    public fun getChildMessageBus(name: Name): SharedFlow<DeviceMessage>? = hubManager.getChildMessageBus(name)
+
+    /**
+     * Get device, using delegate method
+     */
+    public inline operator fun <reified D : Device> get(name: Name): D? = devices[name] as? D
+
+    /**
+     * Get device, using delegate method
+     */
+    public inline operator fun <reified D : Device> get(name: String): D? = devices[name.asName()] as? D
+
+}
+
+public suspend fun WithLifeCycle.stopWithTimeout(timeout: Duration = Duration.INFINITE) {
+    withTimeoutOrNull(timeout) {
+        stop()
+    }
+}
+
+public interface ChildComponentConfig<CD: Device>{
+    public val spec: CompositeControlComponentSpec<CD>
+    public val config: DeviceLifecycleConfig
+    public val meta: Meta?
+    public val name: Name
+}

controls-core/src/commonMain/kotlin/space/kscience/controls/spec/CompositeControlComponentsDelegates.kt

@@ -0,0 +1,384 @@
+package space.kscience.controls.spec
+
+import kotlinx.coroutines.Deferred
+import space.kscience.controls.api.ActionDescriptorBuilder
+import space.kscience.controls.api.Device
+import space.kscience.controls.api.PropertyDescriptorBuilder
+import space.kscience.controls.api.id
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MetaConverter
+import space.kscience.dataforge.meta.ValueType
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.string
+import kotlin.properties.PropertyDelegateProvider
+import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KMutableProperty1
+import kotlin.reflect.KProperty1
+
+/**
+ * Create a [MetaConverter] for enum values
+ */
+public fun <E : Enum<E>> createEnumConverter(enumValues: Array<E>): MetaConverter<E> = object : MetaConverter<E> {
+    override val descriptor: MetaDescriptor = MetaDescriptor {
+        valueType(ValueType.STRING)
+        allowedValues(enumValues.map { it.name })
+    }
+
+    override fun readOrNull(source: Meta): E? {
+        val value = source.value ?: return null
+        return enumValues.firstOrNull { it.name == value.string }
+    }
+
+    override fun convert(obj: E): Meta = Meta(obj.name)
+}
+
+/**
+ * A read-only device property that delegates reading to a device [KProperty1]
+ */
+public fun <T, D : Device> CompositeControlComponentSpec<D>.property(
+    converter: MetaConverter<T>,
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> T?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, T>>> {
+    return  property(converter, descriptorBuilder, name, read)
+}
+
+/**
+ * Mutable property that delegates reading and writing to a device [KMutableProperty1]
+ */
+public fun <T, D : Device> CompositeControlComponentSpec<D>.mutableProperty(
+    converter: MetaConverter<T>,
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> T?,
+    write: suspend D.(propertyName: String, value: T) -> Unit,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, T>>> {
+    return  mutableProperty(converter, descriptorBuilder, name, read, write)
+}
+
+/**
+ * Register a mutable logical property (without a corresponding physical state) for a device
+ */
+public fun <T, D : DeviceBase<D>> CompositeControlComponentSpec<D>.logical(
+    converter: MetaConverter<T>,
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, T>>> =
+    mutableProperty(
+        converter,
+        descriptorBuilder,
+        name,
+        read = { propertyName -> getProperty(propertyName)?.let(converter::readOrNull) },
+        write = { propertyName, value -> writeProperty(propertyName, converter.convert(value)) }
+    )
+
+/**
+ * Creates a boolean property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.boolean(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Boolean?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, Boolean>>> =
+    property(MetaConverter.boolean, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable boolean property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.booleanMutable(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Boolean?,
+    write: suspend D.(propertyName: String, value: Boolean) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, Boolean>>> =
+    mutableProperty(MetaConverter.boolean, descriptorBuilder, name, read, write)
+
+/**
+ * Creates a read-only number property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.number(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Number?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, Number>>> =
+    property(MetaConverter.number, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable number property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.numberMutable(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Number?,
+    write: suspend D.(propertyName: String, value: Number) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, Number>>> =
+    mutableProperty(MetaConverter.number, descriptorBuilder, name, read, write)
+
+
+/**
+ * Creates a read-only double property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.double(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Double?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, Double>>> =
+    property(MetaConverter.double, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable double property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.doubleMutable(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Double?,
+    write: suspend D.(propertyName: String, value: Double) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, Double>>> =
+    mutableProperty(MetaConverter.double, descriptorBuilder, name, read, write)
+
+/**
+ * Creates a read-only string property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.string(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> String?
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, String>>> =
+    property(MetaConverter.string, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable string property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.stringMutableProperty(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> String?,
+    write: suspend D.(propertyName: String, value: String) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, String>>> =
+    mutableProperty(MetaConverter.string, descriptorBuilder, name, read, write)
+
+/**
+ * Creates a read-only meta property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.meta(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Meta?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, Meta>>> =
+    property(MetaConverter.meta, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable meta property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.metaMutable(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Meta?,
+    write: suspend D.(propertyName: String, value: Meta) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, Meta>>> =
+    mutableProperty(MetaConverter.meta, descriptorBuilder, name, read, write)
+
+/**
+ * Creates a read-only enum property for a device.
+ */
+public fun <E : Enum<E>, D : Device> CompositeControlComponentSpec<D>.enum(
+    enumValues: Array<E>,
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> E?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, E>>> {
+    val converter = createEnumConverter(enumValues)
+    return property(converter, descriptorBuilder, name, read)
+}
+
+/**
+ * Creates a mutable enum property for a device.
+ */
+public fun <E : Enum<E>, D : Device> CompositeControlComponentSpec<D>.enumMutable(
+    enumValues: Array<E>,
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> E?,
+    write: suspend D.(propertyName: String, value: E) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, E>>> {
+    val converter = createEnumConverter(enumValues)
+    return mutableProperty(converter, descriptorBuilder, name, read, write)
+}
+
+/**
+ * Creates a read-only float property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.float(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Float?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, Float>>> =
+    property(MetaConverter.float, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable float property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.floatMutable(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Float?,
+    write: suspend D.(propertyName: String, value: Float) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, Float>>> =
+    mutableProperty(MetaConverter.float, descriptorBuilder, name, read, write)
+
+/**
+ * Creates a read-only long property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.long(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Long?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, Long>>> =
+    property(MetaConverter.long, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable long property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.longMutable(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Long?,
+    write: suspend D.(propertyName: String, value: Long) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, Long>>> =
+    mutableProperty(MetaConverter.long, descriptorBuilder, name, read, write)
+
+/**
+ * Creates a read-only int property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.int(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Int?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, Int>>> =
+    property(MetaConverter.int, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable int property for a device.
+ */
+public fun <D : Device> CompositeControlComponentSpec<D>.intMutable(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Int?,
+    write: suspend D.(propertyName: String, value: Int) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, Int>>> =
+    mutableProperty(MetaConverter.int, descriptorBuilder, name, read, write)
+
+/**
+ * Creates a read-only list property for a device.
+ */
+public fun <T, D : Device> CompositeControlComponentSpec<D>.list(
+    converter: MetaConverter<List<T>>,
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> List<T>?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, List<T>>>> =
+    property(converter, descriptorBuilder, name, read)
+
+/**
+ * Creates a mutable list property for a device.
+ */
+public fun <T, D : Device> CompositeControlComponentSpec<D>.listMutable(
+    converter: MetaConverter<List<T>>,
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> List<T>?,
+    write: suspend D.(propertyName: String, value: List<T>) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, List<T>>>> =
+    mutableProperty(converter, descriptorBuilder, name, read, write)
+
+
+public fun <I, O, D : Device> CompositeControlComponentSpec<D>.asyncActionProperty(
+    inputConverter: MetaConverter<I>,
+    outputConverter: MetaConverter<O>,
+    descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    execute: suspend D.(I) -> Deferred<O>,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DeviceActionSpec<D, I, O>>> =
+    action(inputConverter, outputConverter, descriptorBuilder, name) { input ->
+        execute(input).await()
+    }
+
+public fun <T, D : Device> CompositeControlComponentSpec<D>.metaProperty(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Meta?,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DevicePropertySpec<D, Meta>>> =
+    property(MetaConverter.meta, descriptorBuilder, name, read)
+
+
+public fun <T, D : Device> CompositeControlComponentSpec<D>.mutableMetaProperty(
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    read: suspend D.(propertyName: String) -> Meta?,
+    write: suspend D.(propertyName: String, value: Meta) -> Unit
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, MutableDevicePropertySpec<D, Meta>>> =
+    mutableProperty(MetaConverter.meta, descriptorBuilder, name, read, write)
+
+/**
+ * An action that takes no parameters and returns no values
+ */
+public fun <T, D : Device> CompositeControlComponentSpec<D>.unitAction(
+    descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    execute: suspend D.() -> Unit,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DeviceActionSpec<D, Unit, Unit>>> =
+    action(
+        MetaConverter.unit,
+        MetaConverter.unit,
+        descriptorBuilder,
+        name
+    ) {
+        execute()
+    }
+
+public fun <I, O, D : Device> CompositeControlComponentSpec<D>.asyncAction(
+    inputConverter: MetaConverter<I>,
+    outputConverter: MetaConverter<O>,
+    descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    execute: suspend D.(I) -> Deferred<O>,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DeviceActionSpec<D, I, O>>> =
+    action(
+        inputConverter,
+        outputConverter,
+        descriptorBuilder,
+        name
+    ) {
+        execute(it).await()
+    }
+
+/**
+ * An action that takes [Meta] and returns [Meta]. No conversions are done
+ */
+public fun <T, D : Device> CompositeControlComponentSpec<D>.metaAction(
+    descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
+    name: String? = null,
+    execute: suspend D.(Meta) -> Meta,
+): PropertyDelegateProvider<CompositeControlComponentSpec<D>, ReadOnlyProperty<CompositeControlComponentSpec<D>, DeviceActionSpec<D, Meta, Meta>>> =
+    action(
+        MetaConverter.meta,
+        MetaConverter.meta,
+        descriptorBuilder,
+        name
+    ) {
+        execute(it)
+    }
+
+/**
+ * Throw an exception if device does not have all properties and actions defined by this specification
+ */
+public fun CompositeControlComponentSpec<*>.validate(device: Device) {
+    properties.map { it.value.descriptor }.forEach { specProperty ->
+        check(specProperty in device.propertyDescriptors) { "Property ${specProperty.name} not registered in ${device.id}" }
+    }
+
+    actions.map { it.value.descriptor }.forEach { specAction ->
+        check(specAction in device.actionDescriptors) { "Action ${specAction.name} not registered in ${device.id}" }
+    }
+}

controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceSpec.kt

@@ -44,24 +44,24 @@ public abstract class DeviceSpec<D : Device> {
 
     public fun <T> property(
         converter: MetaConverter<T>,
-        descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+        descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
         name: String? = null,
         read: suspend D.(propertyName: String) -> T?,
     ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DevicePropertySpec<D, T>>> =
         PropertyDelegateProvider { _: DeviceSpec<D>, property ->
             val propertyName = name ?: property.name
-            val deviceProperty = object : DevicePropertySpec<D, T> {
+            val descriptor = propertyDescriptor(propertyName) {
-
+                mutable = false
-                override val descriptor: PropertyDescriptor = PropertyDescriptor(propertyName).apply {
+                converter.descriptor?.let { converterDescriptor ->
-                    converter.descriptor?.let { converterDescriptor ->
+                    metaDescriptor {
-                        metaDescriptor {
+                        from(converterDescriptor)
-                            from(converterDescriptor)
-                        }
                     }
-                    fromSpec(property)
-                    descriptorBuilder()
                 }
-
+                fromSpec(property)
+                descriptorBuilder()
+            }
+            val deviceProperty = object : DevicePropertySpec<D, T> {
+                override val descriptor = descriptor
                 override val converter: MetaConverter<T> = converter
 
                 override suspend fun read(device: D): T? =
@@ -75,26 +75,25 @@ public abstract class DeviceSpec<D : Device> {
 
     public fun <T> mutableProperty(
         converter: MetaConverter<T>,
-        descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+        descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
         name: String? = null,
         read: suspend D.(propertyName: String) -> T?,
         write: suspend D.(propertyName: String, value: T) -> Unit,
     ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, MutableDevicePropertySpec<D, T>>> =
         PropertyDelegateProvider { _: DeviceSpec<D>, property: KProperty<*> ->
             val propertyName = name ?: property.name
-            val deviceProperty = object : MutableDevicePropertySpec<D, T> {
+            val descriptor = propertyDescriptor(propertyName) {
-                override val descriptor: PropertyDescriptor = PropertyDescriptor(
+                this.mutable = true
-                    propertyName,
+                converter.descriptor?.let { converterDescriptor ->
-                    mutable = true
+                    metaDescriptor {
-                ).apply {
+                        from(converterDescriptor)
-                    converter.descriptor?.let { converterDescriptor ->
-                        metaDescriptor {
-                            from(converterDescriptor)
-                        }
                     }
-                    fromSpec(property)
-                    descriptorBuilder()
                 }
+                fromSpec(property)
+                descriptorBuilder()
+            }
+            val deviceProperty = object : MutableDevicePropertySpec<D, T> {
+                override val descriptor = descriptor
                 override val converter: MetaConverter<T> = converter
 
                 override suspend fun read(device: D): T? =
@@ -119,30 +118,28 @@ public abstract class DeviceSpec<D : Device> {
     public fun <I, O> action(
         inputConverter: MetaConverter<I>,
         outputConverter: MetaConverter<O>,
-        descriptorBuilder: ActionDescriptor.() -> Unit = {},
+        descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
         name: String? = null,
         execute: suspend D.(I) -> O,
     ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DeviceActionSpec<D, I, O>>> =
         PropertyDelegateProvider { _: DeviceSpec<D>, property: KProperty<*> ->
             val actionName = name ?: property.name
-            val deviceAction = object : DeviceActionSpec<D, I, O> {
+            val descriptor = actionDescriptor(actionName) {
-                override val descriptor: ActionDescriptor = ActionDescriptor(actionName).apply {
+                inputConverter.descriptor?.let { converterDescriptor ->
-                    inputConverter.descriptor?.let { converterDescriptor ->
+                    inputMeta {
-                        inputMetaDescriptor = MetaDescriptor {
+                        from(converterDescriptor)
-                            from(converterDescriptor)
-                            from(inputMetaDescriptor)
-                        }
                     }
-                    outputConverter.descriptor?.let { converterDescriptor ->
-                        outputMetaDescriptor = MetaDescriptor {
-                            from(converterDescriptor)
-                            from(outputMetaDescriptor)
-                        }
-                    }
-
-                    fromSpec(property)
-                    descriptorBuilder()
                 }
+                outputConverter.descriptor?.let { converterDescriptor ->
+                    outputMeta {
+                        from(converterDescriptor)
+                    }
+                }
+                fromSpec(property)
+                descriptorBuilder()
+            }
+            val deviceAction = object : DeviceActionSpec<D, I, O> {
+                override val descriptor: ActionDescriptor = descriptor
 
                 override val inputConverter: MetaConverter<I> = inputConverter
                 override val outputConverter: MetaConverter<O> = outputConverter
@@ -162,7 +159,7 @@ public abstract class DeviceSpec<D : Device> {
  * An action that takes no parameters and returns no values
  */
 public fun <D : Device> DeviceSpec<D>.unitAction(
-    descriptorBuilder: ActionDescriptor.() -> Unit = {},
+    descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     execute: suspend D.() -> Unit,
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DeviceActionSpec<D, Unit, Unit>>> =
@@ -179,7 +176,7 @@ public fun <D : Device> DeviceSpec<D>.unitAction(
  * An action that takes [Meta] and returns [Meta]. No conversions are done
  */
 public fun <D : Device> DeviceSpec<D>.metaAction(
-    descriptorBuilder: ActionDescriptor.() -> Unit = {},
+    descriptorBuilder: ActionDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     execute: suspend D.(Meta) -> Meta,
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DeviceActionSpec<D, Meta, Meta>>> =

controls-core/src/commonMain/kotlin/space/kscience/controls/spec/fromSpec.kt

@@ -1,10 +1,10 @@
 package space.kscience.controls.spec
 
-import space.kscience.controls.api.ActionDescriptor
+import space.kscience.controls.api.ActionDescriptorBuilder
-import space.kscience.controls.api.PropertyDescriptor
+import space.kscience.controls.api.PropertyDescriptorBuilder
 import kotlin.reflect.KProperty
 
 
-internal expect fun PropertyDescriptor.fromSpec(property: KProperty<*>)
+internal expect fun PropertyDescriptorBuilder.fromSpec(property: KProperty<*>)
 
-internal expect fun ActionDescriptor.fromSpec(property: KProperty<*>)
+internal expect fun ActionDescriptorBuilder.fromSpec(property: KProperty<*>)

controls-core/src/commonMain/kotlin/space/kscience/controls/spec/propertySpecDelegates.kt

@@ -1,8 +1,7 @@
 package space.kscience.controls.spec
 
 import space.kscience.controls.api.Device
-import space.kscience.controls.api.PropertyDescriptor
+import space.kscience.controls.api.PropertyDescriptorBuilder
-import space.kscience.controls.api.metaDescriptor
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MetaConverter
 import space.kscience.dataforge.meta.ValueType
@@ -17,7 +16,7 @@ import kotlin.reflect.KProperty1
 public fun <T, D : Device> DeviceSpec<D>.property(
     converter: MetaConverter<T>,
     readOnlyProperty: KProperty1<D, T>,
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DevicePropertySpec<D, T>>> = property(
     converter,
     descriptorBuilder,
@@ -31,7 +30,7 @@ public fun <T, D : Device> DeviceSpec<D>.property(
 public fun <T, D : Device> DeviceSpec<D>.mutableProperty(
     converter: MetaConverter<T>,
     readWriteProperty: KMutableProperty1<D, T>,
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, MutableDevicePropertySpec<D, T>>> =
     mutableProperty(
         converter,
@@ -49,7 +48,7 @@ public fun <T, D : Device> DeviceSpec<D>.mutableProperty(
  */
 public fun <T, D : DeviceBase<D>> DeviceSpec<D>.property(
     converter: MetaConverter<T>,
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DevicePropertySpec<D, T>>> =
     property(
@@ -60,7 +59,7 @@ public fun <T, D : DeviceBase<D>> DeviceSpec<D>.property(
     )
 
 public fun <D : Device> DeviceSpec<D>.booleanProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> Boolean?
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DevicePropertySpec<D, Boolean>>> = property(
@@ -76,8 +75,8 @@ public fun <D : Device> DeviceSpec<D>.booleanProperty(
 )
 
 private inline fun numberDescriptor(
-    crossinline descriptorBuilder: PropertyDescriptor.() -> Unit = {}
+    crossinline descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {}
-): PropertyDescriptor.() -> Unit = {
+): PropertyDescriptorBuilder.() -> Unit = {
     metaDescriptor {
         valueType(ValueType.NUMBER)
     }
@@ -85,7 +84,7 @@ private inline fun numberDescriptor(
 }
 
 public fun <D : Device> DeviceSpec<D>.numberProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> Number?
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DevicePropertySpec<D, Number>>> = property(
@@ -96,7 +95,7 @@ public fun <D : Device> DeviceSpec<D>.numberProperty(
 )
 
 public fun <D : Device> DeviceSpec<D>.doubleProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> Double?
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DevicePropertySpec<D, Double>>> = property(
@@ -107,7 +106,7 @@ public fun <D : Device> DeviceSpec<D>.doubleProperty(
 )
 
 public fun <D : Device> DeviceSpec<D>.stringProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> String?
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DevicePropertySpec<D, String>>> = property(
@@ -123,7 +122,7 @@ public fun <D : Device> DeviceSpec<D>.stringProperty(
 )
 
 public fun <D : Device> DeviceSpec<D>.metaProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> Meta?
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, DevicePropertySpec<D, Meta>>> = property(
@@ -147,7 +146,7 @@ public fun <D : Device> DeviceSpec<D>.metaProperty(
  */
 public fun <T, D : DeviceBase<D>> DeviceSpec<D>.mutableProperty(
     converter: MetaConverter<T>,
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
 ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, MutableDevicePropertySpec<D, T>>> =
     mutableProperty(
@@ -159,7 +158,7 @@ public fun <T, D : DeviceBase<D>> DeviceSpec<D>.mutableProperty(
     )
 
 public fun <D : Device> DeviceSpec<D>.mutableBooleanProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> Boolean?,
     write: suspend D.(propertyName: String, value: Boolean) -> Unit
@@ -179,7 +178,7 @@ public fun <D : Device> DeviceSpec<D>.mutableBooleanProperty(
 
 
 public fun <D : Device> DeviceSpec<D>.mutableNumberProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> Number,
     write: suspend D.(propertyName: String, value: Number) -> Unit
@@ -187,7 +186,7 @@ public fun <D : Device> DeviceSpec<D>.mutableNumberProperty(
     mutableProperty(MetaConverter.number, numberDescriptor(descriptorBuilder), name, read, write)
 
 public fun <D : Device> DeviceSpec<D>.mutableDoubleProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> Double,
     write: suspend D.(propertyName: String, value: Double) -> Unit
@@ -195,7 +194,7 @@ public fun <D : Device> DeviceSpec<D>.mutableDoubleProperty(
     mutableProperty(MetaConverter.double, numberDescriptor(descriptorBuilder), name, read, write)
 
 public fun <D : Device> DeviceSpec<D>.mutableStringProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> String,
     write: suspend D.(propertyName: String, value: String) -> Unit
@@ -203,7 +202,7 @@ public fun <D : Device> DeviceSpec<D>.mutableStringProperty(
     mutableProperty(MetaConverter.string, descriptorBuilder, name, read, write)
 
 public fun <D : Device> DeviceSpec<D>.mutableMetaProperty(
-    descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+    descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
     name: String? = null,
     read: suspend D.(propertyName: String) -> Meta,
     write: suspend D.(propertyName: String, value: Meta) -> Unit

controls-core/src/commonTest/kotlin/space/kscience/controls/spec/CompositeControlTest.kt

@@ -0,0 +1,822 @@
+package space.kscience.controls.spec
+
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.test.runTest
+import space.kscience.dataforge.context.Context
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.double
+import space.kscience.dataforge.meta.int
+import space.kscience.dataforge.names.parseAsName
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
+
+class CompositeControlTest {
+
+    // ---------------------- Device Specifications ----------------------------------
+
+    public object StepperMotorSpec : CompositeControlComponentSpec<StepperMotorDevice>() {
+        public val position by intMutable(
+            name = "position",
+            read = { getPosition() },
+            write = { _, value -> setPosition(value) }
+        )
+
+        public val maxPosition by int(
+            name = "maxPosition",
+            read = { maxPosition }
+        )
+    }
+
+    public object ValveSpec : CompositeControlComponentSpec<ValveDevice>() {
+        public val state by booleanMutable(
+            read = { getState() },
+            write = { _, value -> setState(value) }
+        )
+    }
+
+    public object PressureChamberSpec : CompositeControlComponentSpec<PressureChamberDevice>() {
+        public val pressure by doubleMutable(
+            read = { getPressure() },
+            write = { _, value -> setPressure(value) }
+        )
+    }
+
+    public object SyringePumpSpec : CompositeControlComponentSpec<SyringePumpDevice>() {
+        public val volume by doubleMutable(
+            read = { getVolume() },
+            write = { _, value -> setVolume(value) }
+        )
+    }
+
+    public object ReagentSensorSpec : CompositeControlComponentSpec<ReagentSensorDevice>() {
+        public val isPresent by boolean(
+            read = { checkReagent() }
+        )
+    }
+
+    public object NeedleSpec : CompositeControlComponentSpec<NeedleDevice>() {
+        public val mode by enumMutable(
+            enumValues = NeedleDevice.Mode.entries.toTypedArray(),
+            read = { getMode() },
+            write = { _, value -> setMode(value) }
+        )
+
+        public val position by doubleMutable(
+            read = { getPosition() },
+            write = { _, value -> setPosition(value) }
+        )
+    }
+
+    public object ShakerSpec : CompositeControlComponentSpec<ShakerDevice>() {
+        public val verticalMotor by childSpec<StepperMotorSpec, StepperMotorDevice>()
+        public val horizontalMotor by childSpec<StepperMotorSpec, StepperMotorDevice>()
+    }
+
+    public object TransportationSystemSpec : CompositeControlComponentSpec<TransportationSystem>() {
+        public val slideMotor by childSpec<StepperMotorSpec, StepperMotorDevice>()
+
+        public val pushMotor by childSpec<StepperMotorSpec, StepperMotorDevice>()
+
+        public val receiveMotor by childSpec<StepperMotorSpec, StepperMotorDevice>()
+    }
+
+
+    public object AnalyzerSpec : CompositeControlComponentSpec<AnalyzerDevice>() {
+        public val transportationSystem by childSpec<TransportationSystemSpec, TransportationSystemSpec>()
+        public val shakerDevice by childSpec<ShakerSpec, ShakerDevice>()
+        public val needleDevice by childSpec<NeedleSpec, NeedleDevice>()
+
+
+        public val valveV20 by childSpec<ValveSpec, ValveDevice>()
+        public val valveV17 by childSpec<ValveSpec, ValveDevice>()
+        public val valveV18 by childSpec<ValveSpec, ValveDevice>()
+        public val valveV35 by childSpec<ValveSpec, ValveDevice>()
+
+
+        public val pressureChamberHigh by childSpec<PressureChamberSpec, PressureChamberDevice>()
+        public val pressureChamberLow by childSpec<PressureChamberSpec, PressureChamberDevice>()
+
+        public val syringePumpMA100 by childSpec<SyringePumpSpec, SyringePumpDevice>()
+        public val syringePumpMA25 by childSpec<SyringePumpSpec, SyringePumpDevice>()
+
+        public val reagentSensor1 by childSpec<ReagentSensorSpec, ReagentSensorDevice>()
+        public val reagentSensor2 by childSpec<ReagentSensorSpec, ReagentSensorDevice>()
+        public val reagentSensor3 by childSpec<ReagentSensorSpec, ReagentSensorDevice>()
+    }
+
+// ---------------------- Device Implementations ----------------------------------
+
+    // Implementation of Stepper Motor Device
+    public class StepperMotorDevice(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<StepperMotorDevice>(StepperMotorSpec, context, meta) {
+
+        private var _position: Int = 0
+        public val maxPosition: Int = meta["maxPosition".parseAsName()].int ?: 100
+
+        /**
+         * Get current position of the stepper motor.
+         * @return Current position as Int
+         */
+        public suspend fun getPosition(): Int = _position
+
+        /**
+         * Set position of the stepper motor, if position is valid the move will occur.
+         * @param value target position as Int
+         */
+        public suspend fun setPosition(value: Int) {
+            if (value in 0..maxPosition) {
+                _position = value
+                println("StepperMotorDevice: Moving to position $_position")
+                delay(100)
+            } else {
+                println("StepperMotorDevice: Invalid position $value (max: $maxPosition)")
+            }
+        }
+
+    }
+
+    // Implementation of Valve Device
+    public class ValveDevice(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<ValveDevice>(ValveSpec, context, meta) {
+
+        private var _state: Boolean = false
+
+        /**
+         * Get current state of the valve
+         * @return true if valve is open, false if closed
+         */
+        public suspend fun getState(): Boolean = _state
+
+        /**
+         * Set the current state of the valve and print the change.
+         * @param value true if valve should be open, false if should be closed
+         */
+        public suspend fun setState(value: Boolean) {
+            _state = value
+            val stateStr = if (_state) "open" else "closed"
+            println("ValveDevice: Valve is now $stateStr")
+            delay(50)
+        }
+
+        /**
+         * Simulates clicking the valve.
+         */
+        public suspend fun click() {
+            println("ValveDevice: Clicking valve...")
+            setState(true)
+            delay(50)
+            setState(false)
+            println("ValveDevice: Valve click completed")
+        }
+
+    }
+
+    // Implementation of Pressure Chamber Device
+    public class PressureChamberDevice(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<PressureChamberDevice>(PressureChamberSpec, context, meta) {
+
+        private var _pressure: Double = 0.0
+
+        /**
+         * Get the current pressure in the chamber.
+         * @return current pressure as Double
+         */
+        public suspend fun getPressure(): Double = _pressure
+
+        /**
+         * Set the pressure in the chamber.
+         * @param value target pressure as Double
+         */
+        public suspend fun setPressure(value: Double) {
+            _pressure = value
+            println("PressureChamberDevice: Pressure is now $_pressure")
+            delay(50)
+        }
+
+    }
+
+    // Implementation of Syringe Pump Device
+    public class SyringePumpDevice(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<SyringePumpDevice>(SyringePumpSpec, context, meta) {
+
+        private var _volume: Double = 0.0
+        public val maxVolume: Double = meta["maxVolume".parseAsName()].double ?: 5.0
+
+        /**
+         * Get current volume in the syringe
+         * @return volume as Double
+         */
+        public suspend fun getVolume(): Double = _volume
+
+        /**
+         * Set the current volume in the syringe.
+         * @param value the target volume as Double
+         */
+        public suspend fun setVolume(value: Double) {
+            if (value in 0.0..maxVolume) {
+                _volume = value
+                println("SyringePumpDevice: Volume is now $_volume ml")
+                delay(100)
+            } else {
+                println("SyringePumpDevice: Invalid volume $value (max: $maxVolume)")
+            }
+        }
+
+    }
+
+    // Implementation of Reagent Sensor Device
+    public class ReagentSensorDevice(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<ReagentSensorDevice>(ReagentSensorSpec, context, meta) {
+
+        /**
+         * Checks for reagent presence.
+         * @return true if reagent is present.
+         */
+        public suspend fun checkReagent(): Boolean {
+            println("ReagentSensorDevice: Checking for reagent presence...")
+            delay(100) // Simulate detection time
+            val isPresent = true // Assume reagent is present
+            println("ReagentSensorDevice: Reagent is ${if (isPresent) "present" else "not present"}")
+            return isPresent
+        }
+
+    }
+
+    // Implementation of Needle Device
+    public class NeedleDevice(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<NeedleDevice>(NeedleSpec, context, meta) {
+
+        public enum class Mode { SAMPLING, WASHING }
+
+        private var _mode: Mode = Mode.WASHING
+        private var _position: Double = 0.0
+
+        /**
+         * Get the current mode of needle.
+         * @return current mode of the needle.
+         */
+        public suspend fun getMode(): Mode = _mode
+
+        /**
+         * Set the mode of the needle
+         * @param value the target mode
+         */
+        public suspend fun setMode(value: Mode) {
+            _mode = value
+            println("NeedleDevice: Mode is now $_mode")
+            delay(50)
+        }
+
+        /**
+         * Get current position of the needle
+         * @return current position as Double
+         */
+        public suspend fun getPosition(): Double = _position
+
+        /**
+         * Set the needle position
+         * @param value target position as Double
+         */
+        public suspend fun setPosition(value: Double) {
+            if (value in 0.0..100.0) {
+                _position = value
+                println("NeedleDevice: Moved to position $_position mm")
+                delay(100)
+            } else {
+                println("NeedleDevice: Invalid position $value mm")
+            }
+        }
+
+        /**
+         * Executes washing process for given duration
+         * @param duration time for washing in seconds
+         */
+        public suspend fun performWashing(duration: Int) {
+            println("NeedleDevice: Washing in progress for $duration seconds")
+            delay(duration * 1000L) // Simulate washing (1 second = 1000 ms)
+        }
+
+        /**
+         * Execute sampling procedure
+         */
+        public suspend fun performSampling() {
+            println("NeedleDevice: Performing sample intake at position $_position mm")
+            delay(500) // Simulate sampling time
+        }
+
+    }
+
+    // Implementation of Shaker Device
+    public class ShakerDevice(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<ShakerDevice>(ShakerSpec, context, meta) {
+
+        /**
+         * Get vertical stepper motor
+         */
+        public val verticalMotor by childDevice<StepperMotorDevice>()
+
+        /**
+         * Get horizontal stepper motor
+         */
+        public val horizontalMotor by childDevice<StepperMotorDevice>()
+
+        /**
+         * Shakes the device for given cycles.
+         * @param cycles amount of cycles for shaking
+         */
+        public suspend fun shake(cycles: Int) {
+            println("ShakerDevice: Shaking started, cycles: $cycles")
+            repeat(cycles) {
+                verticalMotor.setPosition(3)
+                verticalMotor.setPosition(1)
+                println("ShakerDevice: cycle ${it+1} done")
+            }
+            println("ShakerDevice: Shaking completed")
+        }
+    }
+
+    // Implementation of Transportation System
+    public class TransportationSystem(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<TransportationSystem>(TransportationSystemSpec, context, meta) {
+
+        /**
+         * Get slide stepper motor
+         */
+        public val slideMotor by childDevice<StepperMotorDevice>()
+
+
+        /**
+         * Get push stepper motor
+         */
+        public val pushMotor by childDevice<StepperMotorDevice>()
+
+        /**
+         * Get receive stepper motor
+         */
+        public val receiveMotor by childDevice<StepperMotorDevice>()
+
+    }
+
+    // Implementation of Analyzer Device
+    public class AnalyzerDevice(
+        context: Context,
+        meta: Meta = Meta.EMPTY
+    ) : ConfigurableCompositeControlComponent<AnalyzerDevice>(AnalyzerSpec, context, meta) {
+
+        /**
+         * Get transportation system
+         */
+        public val transportationSystem by childDevice<TransportationSystem>()
+
+        /**
+         * Get shaker device
+         */
+        public val shakerDevice by childDevice<ShakerDevice>()
+
+        /**
+         * Get needle device
+         */
+        public val needleDevice by childDevice<NeedleDevice>()
+
+        /**
+         * Get valve V20
+         */
+        public val valveV20 by childDevice<ValveDevice>()
+
+        /**
+         * Get valve V17
+         */
+        public val valveV17 by childDevice<ValveDevice>()
+
+        /**
+         * Get valve V18
+         */
+        public val valveV18 by childDevice<ValveDevice>()
+
+        /**
+         * Get valve V35
+         */
+        public val valveV35 by childDevice<ValveDevice>()
+
+        /**
+         * Get high pressure chamber
+         */
+        public val pressureChamberHigh by childDevice<PressureChamberDevice>()
+
+        /**
+         * Get low pressure chamber
+         */
+        public val pressureChamberLow by childDevice<PressureChamberDevice>()
+
+        /**
+         * Get syringe pump MA100
+         */
+        public val syringePumpMA100 by childDevice<SyringePumpDevice>()
+
+        /**
+         * Get syringe pump MA25
+         */
+        public val syringePumpMA25 by childDevice<SyringePumpDevice>()
+
+        /**
+         * Get reagent sensor 1
+         */
+        public val reagentSensor1 by childDevice<ReagentSensorDevice>()
+
+        /**
+         * Get reagent sensor 2
+         */
+        public val reagentSensor2 by childDevice<ReagentSensorDevice>()
+
+        /**
+         * Get reagent sensor 3
+         */
+        public val reagentSensor3 by childDevice<ReagentSensorDevice>()
+
+        /**
+         * Simulates a process of taking sample from tubes.
+         */
+        public suspend fun processSample() {
+            println("The beginning of the sampling process")
+
+            // Step 1: Open valve V20 and start taking a sample with a syringe pump MA 100 mcl
+            valveV20.setState(true)
+            syringePumpMA100.setVolume(0.1)
+            delay(500)  // Simulating waiting time for liquid collection
+            valveV20.setState(false)
+
+            // Step 2: Open valve V17 and start delivering lysis buffer with syringe pump MA 2.5 ml
+            valveV17.setState(true)
+            syringePumpMA25.setVolume(2.5)
+            delay(500)  // Simulate lysis buffer delivery time
+            valveV17.setState(false)
+
+            // Step 3: Cleaning system
+            syringePumpMA100.setVolume(0.0)
+            syringePumpMA25.setVolume(0.0)
+
+            println("The sampling process is completed")
+        }
+
+
+        /**
+         * Simulates the analyzer calibration procedure.
+         */
+        public suspend fun calibrate() {
+            println("The beginning of calibration...")
+
+            // Step 1: Calibrate positions of all motors
+            val motors = listOf(
+                transportationSystem.slideMotor,
+                transportationSystem.pushMotor,
+                transportationSystem.receiveMotor,
+                shakerDevice.verticalMotor,
+                shakerDevice.horizontalMotor,
+
+                )
+
+            for (motor in motors) {
+                for (position in 0..motor.maxPosition) {
+                    motor.setPosition(position)
+                }
+                motor.setPosition(0)
+            }
+
+            // Step 2: Click all valves and set them to zero position
+            val valves = listOf(valveV20, valveV17, valveV18, valveV35)
+            for (valve in valves) {
+                valve.click()
+                valve.setState(false)
+            }
+
+            // Step 3: Pump up pressure in high pressure chamber
+            pressureChamberHigh.setPressure(2.0)
+            // Step 4: Pump out pressure from low pressure chamber
+            pressureChamberLow.setPressure(-1.0)
+
+            // Step 5: Fill the hydraulic system
+            // 5.1 Check if reagents are present
+            val sensors = listOf(reagentSensor1, reagentSensor2, reagentSensor3)
+            for (sensor in sensors) {
+                sensor.checkReagent()
+            }
+
+            // 5.2 Perform 5 times full pump movement with all syringe pumps
+            val pumps = listOf(syringePumpMA100, syringePumpMA25)
+            for (pump in pumps) {
+                repeat(5) {
+                    pump.setVolume(pump.maxVolume)
+                    pump.setVolume(0.0)
+                }
+            }
+
+            // 5.3 Wash needle at its washing position
+            needleDevice.setPosition(0.0)
+            needleDevice.setMode(NeedleDevice.Mode.WASHING)
+            needleDevice.performWashing(5)
+
+            println("Calibration is completed")
+        }
+
+        /**
+         * Execute recipe 1 - sample tube deliver
+         */
+        public suspend fun executeRecipe1() {
+            println("Executing recipe 1")
+
+            // Step 1: Move a slide to the next position
+            val currentSlidePosition = transportationSystem.slideMotor.getPosition()
+            transportationSystem.slideMotor.setPosition(currentSlidePosition + 1)
+            println("Moved a slide to position ${currentSlidePosition+1}")
+
+            // Step 2: Capture a tube for mixing
+            println("Capturing tube for mixing")
+
+            // 2.1 - 2.10: Control over a shaker and motors
+            shakerDevice.verticalMotor.setPosition(1)
+            shakerDevice.horizontalMotor.setPosition(1)
+            println("Shaker: vertical - 1, horizontal - 1")
+
+            shakerDevice.horizontalMotor.setPosition(2)
+            println("Shaker: horizontal - 2")
+
+            shakerDevice.verticalMotor.setPosition(2)
+            println("Shaker: vertical - 2")
+
+            // Shake
+            shakerDevice.shake(5)
+            println("Shaker: movement done")
+
+            // Step 3: Sampling and measurement
+            executeSampling()
+            needleDevice.setPosition(0.0)
+            println("Needle moved to its initial position")
+
+        }
+
+        /**
+         * Execute recipe 2 - Automatic Measurement
+         */
+        public suspend fun executeRecipe2() {
+            println("Executing Recipe 2 - Automatic Measurement")
+
+            transportationSystem.receiveMotor.setPosition(transportationSystem.receiveMotor.getPosition() + 1)
+            println("Pusher moved to position ${transportationSystem.receiveMotor.getPosition() + 1}")
+
+            //Check for a tray, if missing move again
+            if (!checkTrayInPushSystem()) {
+                println("Tray missing. Trying to move again")
+                transportationSystem.receiveMotor.setPosition(transportationSystem.receiveMotor.getPosition() + 1)
+            } else {
+                executeSampling()
+            }
+
+            // If last position, reset the plate
+            if (transportationSystem.receiveMotor.getPosition() >= transportationSystem.receiveMotor.maxPosition) {
+                println("Plate is complete. Resetting pusher to initial position")
+                transportationSystem.receiveMotor.setPosition(0)
+            }
+
+            println("Recipe 2 execution finished")
+            needleDevice.setPosition(0.0)
+            println("Needle moved to its initial position")
+        }
+
+        /**
+         * Execute recipe 3 - Single Measurement
+         */
+        public suspend fun executeRecipe3() {
+            println("Executing Recipe 3 - Single measurement")
+            executeSampling()
+            println("Recipe 3 completed")
+            needleDevice.setPosition(0.0)
+            println("Needle moved to its initial position")
+        }
+
+
+        /**
+         * Simulates tray presence check
+         */
+        private suspend fun checkTrayInPushSystem(): Boolean {
+            println("Checking for a tray in a pushing system")
+            delay(200)
+            return true // Simulate tray presence
+        }
+
+        /**
+         * Function to execute sampling process with the needle
+         */
+        private suspend fun executeSampling() {
+            needleDevice.setMode(NeedleDevice.Mode.SAMPLING)
+            needleDevice.performSampling()
+            needleDevice.setMode(NeedleDevice.Mode.WASHING)
+            needleDevice.performWashing(2)
+        }
+    }
+
+    private fun createTestContext() = Context("test")
+
+    @Test
+    fun `test StepperMotorDevice position setting`() = runTest {
+        val context = createTestContext()
+        val motor = StepperMotorDevice(context, Meta { "maxPosition" put 500 })
+
+        motor.setPosition(200)
+        assertEquals(200, motor.getPosition(), "Position should be set correctly")
+
+        motor.setPosition(0)
+        assertEquals(0, motor.getPosition(), "Position should be reset to 0")
+
+        motor.setPosition(500)
+        assertEquals(500, motor.getPosition(), "Position should be set to max value")
+    }
+
+    @Test
+    fun `test StepperMotorDevice invalid position`() = runTest {
+        val context = createTestContext()
+        val motor = StepperMotorDevice(context, Meta { "maxPosition" put 100 })
+
+        motor.setPosition(200) //Should be outside the range, so not changed
+        assertEquals(0, motor.getPosition(), "Position should not be set for invalid value")
+    }
+
+
+    @Test
+    fun `test ValveDevice state toggling`() = runTest {
+        val context = createTestContext()
+        val valve = ValveDevice(context)
+
+        assertFalse(valve.getState(), "Initial state should be closed")
+
+        valve.setState(true)
+        assertTrue(valve.getState(), "State should be set to open")
+
+        valve.setState(false)
+        assertFalse(valve.getState(), "State should be set to closed")
+    }
+
+    @Test
+    fun `test ValveDevice click operation`() = runTest {
+        val context = createTestContext()
+        val valve = ValveDevice(context)
+
+        assertFalse(valve.getState(), "Initial state should be closed")
+
+        valve.click()
+        assertFalse(valve.getState(), "Valve should be closed after click")
+    }
+
+    @Test
+    fun `test PressureChamberDevice pressure setting`() = runTest {
+        val context = createTestContext()
+        val chamber = PressureChamberDevice(context)
+
+        chamber.setPressure(1.5)
+        assertEquals(1.5, chamber.getPressure(), "Pressure should be set correctly")
+
+        chamber.setPressure(0.0)
+        assertEquals(0.0, chamber.getPressure(), "Pressure should be set to 0")
+
+        chamber.setPressure(-1.0)
+        assertEquals(-1.0, chamber.getPressure(), "Pressure should be set to negative value")
+    }
+
+    @Test
+    fun `test SyringePumpDevice volume setting`() = runTest {
+        val context = createTestContext()
+        val pump = SyringePumpDevice(context, Meta { "maxVolume" put 10.0 })
+
+        pump.setVolume(3.5)
+        assertEquals(3.5, pump.getVolume(), "Volume should be set correctly")
+
+        pump.setVolume(0.0)
+        assertEquals(0.0, pump.getVolume(), "Volume should be reset to 0")
+
+        pump.setVolume(10.0)
+        assertEquals(10.0, pump.getVolume(), "Volume should be set to max value")
+
+    }
+
+
+    @Test
+    fun `test SyringePumpDevice invalid volume`() = runTest {
+        val context = createTestContext()
+        val pump = SyringePumpDevice(context, Meta { "maxVolume" put 5.0 })
+
+        pump.setVolume(10.0)
+        assertEquals(0.0, pump.getVolume(), "Pump volume should not be set for invalid value")
+    }
+
+    @Test
+    fun `test ReagentSensorDevice checkReagent returns true`() = runTest {
+        val context = createTestContext()
+        val sensor = ReagentSensorDevice(context)
+
+        assertTrue(sensor.checkReagent(), "Reagent sensor should report presence by default")
+    }
+
+    @Test
+    fun `test NeedleDevice position and mode setting`() = runTest {
+        val context = createTestContext()
+        val needle = NeedleDevice(context)
+
+        //Test setting mode
+        needle.setMode(NeedleDevice.Mode.SAMPLING)
+        assertEquals(NeedleDevice.Mode.SAMPLING, needle.getMode(), "Mode should be set to SAMPLING")
+
+        needle.setMode(NeedleDevice.Mode.WASHING)
+        assertEquals(NeedleDevice.Mode.WASHING, needle.getMode(), "Mode should be set to WASHING")
+
+        //Test setting position
+        needle.setPosition(50.0)
+        assertEquals(50.0, needle.getPosition(), "Position should be set correctly")
+
+        needle.setPosition(0.0)
+        assertEquals(0.0, needle.getPosition(), "Position should be set to 0")
+
+        needle.setPosition(100.0)
+        assertEquals(100.0, needle.getPosition(), "Position should be set to max")
+    }
+
+
+    @Test
+    fun `test NeedleDevice invalid position`() = runTest {
+        val context = createTestContext()
+        val needle = NeedleDevice(context)
+
+        needle.setPosition(200.0)
+        assertEquals(0.0, needle.getPosition(), "Needle position should not be set for invalid value")
+
+    }
+
+
+    @Test
+    fun `test ShakerDevice shaking`() = runTest {
+        val context = createTestContext()
+        val shaker = ShakerDevice(context)
+
+        // Access properties to initialize motors and test shaking
+        val verticalMotor = shaker.verticalMotor
+        val horizontalMotor = shaker.horizontalMotor
+
+        shaker.shake(2)
+        val verticalMotorPosition = verticalMotor.getPosition()
+        val horizontalMotorPosition = horizontalMotor.getPosition()
+
+        assertEquals(2,verticalMotorPosition, "Vertical motor position should be set to 2 after shaking")
+        assertEquals(1,horizontalMotorPosition, "Horizontal motor position should be set to 1 after shaking")
+    }
+
+    @Test
+    fun `test TransportationSystem motors existence`() = runTest {
+        val context = createTestContext()
+        val transportationSystem = TransportationSystem(context)
+
+        // Access properties to initialize motors and test existence
+        assertNotNull(transportationSystem.slideMotor, "slideMotor should exist")
+        assertNotNull(transportationSystem.pushMotor, "pushMotor should exist")
+        assertNotNull(transportationSystem.receiveMotor, "receiveMotor should exist")
+    }
+
+
+    @Test
+    fun `test AnalyzerDevice device access`() = runTest{
+        val context = createTestContext()
+        val analyzer = AnalyzerDevice(context)
+
+        // Access properties to initialize child devices and test existence
+        assertNotNull(analyzer.transportationSystem, "Transportation system should exist")
+        assertNotNull(analyzer.shakerDevice, "Shaker device should exist")
+        assertNotNull(analyzer.needleDevice, "Needle device should exist")
+        assertNotNull(analyzer.valveV20, "Valve V20 should exist")
+        assertNotNull(analyzer.valveV17, "Valve V17 should exist")
+        assertNotNull(analyzer.valveV18, "Valve V18 should exist")
+        assertNotNull(analyzer.valveV35, "Valve V35 should exist")
+        assertNotNull(analyzer.pressureChamberHigh, "High pressure chamber should exist")
+        assertNotNull(analyzer.pressureChamberLow, "Low pressure chamber should exist")
+        assertNotNull(analyzer.syringePumpMA100, "Syringe pump MA100 should exist")
+        assertNotNull(analyzer.syringePumpMA25, "Syringe pump MA25 should exist")
+        assertNotNull(analyzer.reagentSensor1, "Reagent sensor 1 should exist")
+        assertNotNull(analyzer.reagentSensor2, "Reagent sensor 2 should exist")
+        assertNotNull(analyzer.reagentSensor3, "Reagent sensor 3 should exist")
+    }
+}

controls-core/src/jsMain/kotlin/space/kscience/controls/spec/fromSpec.js.kt

@@ -1,9 +1,9 @@
 package space.kscience.controls.spec
 
-import space.kscience.controls.api.ActionDescriptor
+import space.kscience.controls.api.ActionDescriptorBuilder
-import space.kscience.controls.api.PropertyDescriptor
+import space.kscience.controls.api.PropertyDescriptorBuilder
 import kotlin.reflect.KProperty
 
-internal actual fun PropertyDescriptor.fromSpec(property: KProperty<*>){}
+internal actual fun PropertyDescriptorBuilder.fromSpec(property: KProperty<*>){}
 
-internal actual fun ActionDescriptor.fromSpec(property: KProperty<*>){}
+internal actual fun ActionDescriptorBuilder.fromSpec(property: KProperty<*>){}

controls-core/src/jvmMain/kotlin/space/kscience/controls/spec/fromSpec.jvm.kt

@@ -1,18 +1,18 @@
 package space.kscience.controls.spec
 
-import space.kscience.controls.api.ActionDescriptor
+import space.kscience.controls.api.ActionDescriptorBuilder
-import space.kscience.controls.api.PropertyDescriptor
+import space.kscience.controls.api.PropertyDescriptorBuilder
 import space.kscience.dataforge.descriptors.Description
 import kotlin.reflect.KProperty
 import kotlin.reflect.full.findAnnotation
 
-internal actual fun PropertyDescriptor.fromSpec(property: KProperty<*>) {
+internal actual fun PropertyDescriptorBuilder.fromSpec(property: KProperty<*>) {
     property.findAnnotation<Description>()?.let {
         description = it.value
     }
 }
 
-internal actual fun ActionDescriptor.fromSpec(property: KProperty<*>){
+internal actual fun ActionDescriptorBuilder.fromSpec(property: KProperty<*>){
     property.findAnnotation<Description>()?.let {
         description = it.value
     }

controls-core/src/nativeMain/kotlin/space/kscience/controls/spec/fromSpec.native.kt

@@ -1,9 +1,9 @@
 package space.kscience.controls.spec
 
-import space.kscience.controls.api.ActionDescriptor
+import space.kscience.controls.api.ActionDescriptorBuilder
-import space.kscience.controls.api.PropertyDescriptor
+import space.kscience.controls.api.PropertyDescriptorBuilder
 import kotlin.reflect.KProperty
 
-internal actual fun PropertyDescriptor.fromSpec(property: KProperty<*>) {}
+internal actual fun PropertyDescriptorBuilder.fromSpec(property: KProperty<*>) {}
 
-internal actual fun ActionDescriptor.fromSpec(property: KProperty<*>){}
+internal actual fun ActionDescriptorBuilder.fromSpec(property: KProperty<*>){}

controls-core/src/wasmJsMain/kotlin/fromSpec.wasm.kt

@@ -1,9 +1,9 @@
 package space.kscience.controls.spec
 
-import space.kscience.controls.api.ActionDescriptor
+import space.kscience.controls.api.ActionDescriptorBuilder
-import space.kscience.controls.api.PropertyDescriptor
+import space.kscience.controls.api.PropertyDescriptorBuilder
 import kotlin.reflect.KProperty
 
-internal actual fun PropertyDescriptor.fromSpec(property: KProperty<*>){}
+internal actual fun PropertyDescriptorBuilder.fromSpec(property: KProperty<*>){}
 
-internal actual fun ActionDescriptor.fromSpec(property: KProperty<*>){}
+internal actual fun ActionDescriptorBuilder.fromSpec(property: KProperty<*>){}

demo/all-things/src/main/kotlin/space/kscience/controls/demo/DemoDevice.kt

@@ -2,7 +2,6 @@ package space.kscience.controls.demo
 
 import kotlinx.coroutines.launch
 import space.kscience.controls.api.Device
-import space.kscience.controls.api.metaDescriptor
 import space.kscience.controls.spec.*
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory

demo/motors/src/main/kotlin/ru/mipt/npm/devices/pimotionmaster/PiMotionMasterDevice.kt

@@ -12,6 +12,7 @@ import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withTimeout
 import space.kscience.controls.api.DeviceHub
 import space.kscience.controls.api.PropertyDescriptor
+import space.kscience.controls.api.PropertyDescriptorBuilder
 import space.kscience.controls.misc.asMeta
 import space.kscience.controls.misc.duration
 import space.kscience.controls.ports.AsynchronousPort
@@ -235,7 +236,7 @@ class PiMotionMasterDevice(
 
             private fun axisBooleanProperty(
                 command: String,
-                descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+                descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
             ) = mutableBooleanProperty(
                 read = {
                     readAxisBoolean("$command?")
@@ -248,7 +249,7 @@ class PiMotionMasterDevice(
 
             private fun axisNumberProperty(
                 command: String,
-                descriptorBuilder: PropertyDescriptor.() -> Unit = {},
+                descriptorBuilder: PropertyDescriptorBuilder.() -> Unit = {},
             ) = mutableDoubleProperty(
                 read = {
                     mm.requestAndParse("$command?", axisId)[axisId]?.toDoubleOrNull()