Add lifecycle to ports. Suspended device start

CHANGELOG.md

@@ -9,6 +9,7 @@
 - `DeviceClient` properly evaluates lifecycle and logs
 - `PeerConnection` API for direct device-device binary sharing
 - DeviceDrawable2D intermediate visualization implementation
+- New interface `WithLifeCycle`. Change Port API to adhere to it.
 
 ### Changed
 - Constructor properties return `DeviceState` in order to be able to subscribe to them
@@ -16,6 +17,8 @@
 - `DeviceClient` now initializes property and action descriptors eagerly.
 - `DeviceHub` now works with `Name` instead of `NameToken`. Tree-like structure is made using `Path`. Device messages no longer have access to sub-devices.
 - Add some utility methods to ports. Synchronous port response could be now consumed as `Source`.
+- `DeviceLifecycleState` is replaced by `LifecycleState`.
+
 
 ### Deprecated
 

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

@@ -3,7 +3,7 @@ package space.kscience.controls.constructor
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.*
 import space.kscience.controls.api.*
-import space.kscience.controls.api.DeviceLifecycleState.*
+import space.kscience.controls.api.LifecycleState.*
 import space.kscience.controls.manager.DeviceManager
 import space.kscience.controls.manager.install
 import space.kscience.controls.spec.DevicePropertySpec
@@ -165,11 +165,11 @@ public open class DeviceGroup(
         return action(argument)
     }
 
-    final override var lifecycleState: DeviceLifecycleState = DeviceLifecycleState.STOPPED
+    final override var lifecycleState: LifecycleState = LifecycleState.STOPPED
         private set
 
 
-    private suspend fun setLifecycleState(lifecycleState: DeviceLifecycleState) {
+    private suspend fun setLifecycleState(lifecycleState: LifecycleState) {
         this.lifecycleState = lifecycleState
         sharedMessageFlow.emit(
             DeviceLifeCycleMessage(lifecycleState)

controls-constructor/src/commonTest/kotlin/space/kscience/controls/constructor/DeviceGroupTest.kt

@@ -4,7 +4,7 @@ import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
 import space.kscience.controls.api.Device
 import space.kscience.controls.api.DeviceLifeCycleMessage
-import space.kscience.controls.api.DeviceLifecycleState
+import space.kscience.controls.api.LifecycleState
 import space.kscience.controls.manager.DeviceManager
 import space.kscience.controls.manager.install
 import space.kscience.controls.spec.doRecurring
@@ -37,7 +37,7 @@ class DeviceGroupTest {
             }
             error("Error!")
         }
-        testDevice.messageFlow.first { it is DeviceLifeCycleMessage && it.state == DeviceLifecycleState.STOPPED }
+        testDevice.messageFlow.first { it is DeviceLifeCycleMessage && it.state == LifecycleState.STOPPED }
         println("stopped")
     }
 }

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

@@ -5,7 +5,7 @@ import kotlinx.coroutines.flow.Flow
 /**
  * A generic bidirectional asynchronous sender/receiver object
  */
-public interface AsynchronousSocket<T> : AutoCloseable {
+public interface AsynchronousSocket<T> : WithLifeCycle {
     /**
      * Send an object to the socket
      */
@@ -15,16 +15,6 @@ public interface AsynchronousSocket<T> : AutoCloseable {
      * Flow of objects received from socket
      */
     public fun subscribe(): Flow<T>
-
-    /**
-     * Start socket operation
-     */
-    public fun open()
-
-    /**
-     * Check if this socket is open
-     */
-    public val isOpen: Boolean
 }
 
 /**

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

@@ -4,7 +4,6 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.flow.*
-import kotlinx.serialization.Serializable
 import space.kscience.controls.api.Device.Companion.DEVICE_TARGET
 import space.kscience.dataforge.context.ContextAware
 import space.kscience.dataforge.context.info
@@ -15,40 +14,13 @@ import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.misc.DfType
 import space.kscience.dataforge.names.parseAsName
 
-/**
- * A lifecycle state of a device
- */
-@Serializable
-public enum class DeviceLifecycleState {
-
-    /**
-     * Device is initializing
-     */
-    STARTING,
-
-    /**
-     * The Device is initialized and running
-     */
-    STARTED,
-
-    /**
-     * The Device is closed
-     */
-    STOPPED,
-
-    /**
-     * The device encountered irrecoverable error
-     */
-    ERROR
-}
-
 /**
  *  General interface describing a managed Device.
  *  [Device] is a supervisor scope encompassing all operations on a device.
  *  When canceled, cancels all running processes.
  */
 @DfType(DEVICE_TARGET)
-public interface Device : ContextAware, CoroutineScope {
+public interface Device : ContextAware, WithLifeCycle, CoroutineScope {
 
     /**
      * Initial configuration meta for the device
@@ -94,18 +66,16 @@ public interface Device : ContextAware, CoroutineScope {
      * Initialize the device. This function suspends until the device is finished initialization.
      * Does nothing if the device is started or is starting
      */
-    public suspend fun start(): Unit = Unit
+    override suspend fun start(): Unit = Unit
 
     /**
      * Close and terminate the device. This function does not wait for the device to be closed.
      */
-    public suspend fun stop() {
+    override suspend fun stop() {
         coroutineContext[Job]?.cancel("The device is closed")
         logger.info { "Device $this is closed" }
     }
 
-    public val lifecycleState: DeviceLifecycleState
-
     public companion object {
         public const val DEVICE_TARGET: String = "device"
     }
@@ -167,3 +137,12 @@ public fun Device.onPropertyChange(
 public fun Device.propertyMessageFlow(propertyName: String): Flow<PropertyChangedMessage> = messageFlow
     .filterIsInstance<PropertyChangedMessage>()
     .filter { it.property == propertyName }
+
+/**
+ * React on device lifecycle events
+ */
+public fun Device.onLifecycleEvent(
+    block: suspend (LifecycleState) -> Unit
+): Job = messageFlow.filterIsInstance<DeviceLifeCycleMessage>().onEach {
+    block(it.state)
+}.launchIn(this)

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

@@ -240,7 +240,7 @@ public data class DeviceErrorMessage(
 @Serializable
 @SerialName("lifecycle")
 public data class DeviceLifeCycleMessage(
-    val state: DeviceLifecycleState,
+    val state: LifecycleState,
     override val sourceDevice: Name = Name.EMPTY,
     override val targetDevice: Name? = null,
     override val comment: String? = null,

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

@@ -0,0 +1,59 @@
+package space.kscience.controls.api
+
+import kotlinx.serialization.Serializable
+
+/**
+ * A lifecycle state of a device
+ */
+@Serializable
+public enum class LifecycleState {
+
+    /**
+     * Device is initializing
+     */
+    STARTING,
+
+    /**
+     * The Device is initialized and running
+     */
+    STARTED,
+
+    /**
+     * The Device is closed
+     */
+    STOPPED,
+
+    /**
+     * The device encountered irrecoverable error
+     */
+    ERROR
+}
+
+
+/**
+ * An object that could be started or stopped functioning
+ */
+public interface WithLifeCycle {
+
+    public suspend fun start()
+
+    public suspend fun stop()
+
+    public val lifecycleState: LifecycleState
+}
+
+/**
+ * Bind this object lifecycle to a device lifecycle
+ *
+ * The starting and stopping are done in device scope
+ */
+public fun WithLifeCycle.bindToDeviceLifecycle(device: Device){
+    device.onLifecycleEvent {
+        when(it){
+            LifecycleState.STARTING -> start()
+            LifecycleState.STARTED -> {/*ignore*/}
+            LifecycleState.STOPPED -> stop()
+            LifecycleState.ERROR -> stop()
+        }
+    }
+}

controls-core/src/commonMain/kotlin/space/kscience/controls/ports/AsynchronousPort.kt

@@ -6,6 +6,7 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.io.Source
 import space.kscience.controls.api.AsynchronousSocket
+import space.kscience.controls.api.LifecycleState
 import space.kscience.dataforge.context.*
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.get
@@ -65,8 +66,8 @@ public abstract class AbstractAsynchronousPort(
 
     protected abstract fun onOpen()
 
-    final override fun open() {
+    final override suspend fun start() {
-        if (!isOpen) {
+        if (lifecycleState == LifecycleState.STOPPED) {
             sendJob = scope.launch {
                 for (data in outgoing) {
                     try {
@@ -80,7 +81,7 @@ public abstract class AbstractAsynchronousPort(
             }
             onOpen()
         } else {
-            logger.warn { "$this already opened" }
+            logger.warn { "$this already started" }
         }
     }
 
@@ -89,7 +90,7 @@ public abstract class AbstractAsynchronousPort(
      * Send a data packet via the port
      */
     override suspend fun send(data: ByteArray) {
-        check(isOpen) { "The port is not opened" }
+        check(lifecycleState == LifecycleState.STARTED) { "The port is not opened" }
         outgoing.send(data)
     }
 
@@ -100,7 +101,7 @@ public abstract class AbstractAsynchronousPort(
      */
     override fun subscribe(): Flow<ByteArray> = incoming.receiveAsFlow()
 
-    override fun close() {
+    override suspend fun stop() {
         outgoing.close()
         incoming.close()
         sendJob?.cancel()

controls-core/src/commonMain/kotlin/space/kscience/controls/ports/SynchronousPort.kt

@@ -7,6 +7,8 @@ import kotlinx.coroutines.sync.withLock
 import kotlinx.io.Buffer
 import kotlinx.io.Source
 import kotlinx.io.readByteArray
+import space.kscience.controls.api.LifecycleState
+import space.kscience.controls.api.WithLifeCycle
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.ContextAware
 
@@ -14,11 +16,7 @@ import space.kscience.dataforge.context.ContextAware
  * A port handler for synchronous (request-response) communication with a port.
  * Only one request could be active at a time (others are suspended).
  */
-public interface SynchronousPort : ContextAware, AutoCloseable {
+public interface SynchronousPort : ContextAware, WithLifeCycle {
-
-    public fun open()
-
-    public val isOpen: Boolean
 
     /**
      * Send a single message and wait for the flow of response chunks.
@@ -71,14 +69,14 @@ private class SynchronousOverAsynchronousPort(
 
     override val context: Context get() = port.context
 
-    override fun open() {
+    override suspend fun start() {
-        if (!port.isOpen) port.open()
+        if (port.lifecycleState == LifecycleState.STOPPED) port.start()
     }
 
-    override val isOpen: Boolean get() = port.isOpen
+    override val lifecycleState: LifecycleState get() = port.lifecycleState
 
-    override fun close() {
+    override suspend fun stop() {
-        if (port.isOpen) port.close()
+        if (port.lifecycleState == LifecycleState.STARTED) port.stop()
     }
 
     override suspend fun <R> respond(

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

@@ -72,7 +72,6 @@ public abstract class DeviceBase<D : Device>(
         onBufferOverflow = BufferOverflow.DROP_OLDEST
     )
 
-    @OptIn(ExperimentalCoroutinesApi::class)
     override val coroutineContext: CoroutineContext = context.newCoroutineContext(
         SupervisorJob(context.coroutineContext[Job]) +
                 CoroutineName("Device $id") +
@@ -188,11 +187,11 @@ public abstract class DeviceBase<D : Device>(
         return spec.executeWithMeta(self, argument ?: Meta.EMPTY)
     }
 
-    final override var lifecycleState: DeviceLifecycleState = DeviceLifecycleState.STOPPED
+    final override var lifecycleState: LifecycleState = LifecycleState.STOPPED
         private set
 
 
-    private suspend fun setLifecycleState(lifecycleState: DeviceLifecycleState) {
+    private suspend fun setLifecycleState(lifecycleState: LifecycleState) {
         this.lifecycleState = lifecycleState
         sharedMessageFlow.emit(
             DeviceLifeCycleMessage(lifecycleState)
@@ -204,11 +203,11 @@ public abstract class DeviceBase<D : Device>(
     }
 
     final override suspend fun start() {
-        if (lifecycleState == DeviceLifecycleState.STOPPED) {
+        if (lifecycleState == LifecycleState.STOPPED) {
             super.start()
-            setLifecycleState(DeviceLifecycleState.STARTING)
+            setLifecycleState(LifecycleState.STARTING)
             onStart()
-            setLifecycleState(DeviceLifecycleState.STARTED)
+            setLifecycleState(LifecycleState.STARTED)
         } else {
             logger.debug { "Device $this is already started" }
         }
@@ -220,7 +219,7 @@ public abstract class DeviceBase<D : Device>(
 
     final override suspend fun stop() {
         onStop()
-        setLifecycleState(DeviceLifecycleState.STOPPED)
+        setLifecycleState(LifecycleState.STOPPED)
         super.stop()
     }
 

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

@@ -33,7 +33,7 @@ public abstract class DeviceSpec<D : Device> {
     public open suspend fun D.onOpen() {
     }
 
-    public open fun D.onClose() {
+    public open suspend fun D.onClose() {
     }
 
 

controls-core/src/jvmMain/kotlin/space/kscience/controls/ports/ChannelPort.kt

@@ -1,6 +1,7 @@
 package space.kscience.controls.ports
 
 import kotlinx.coroutines.*
+import space.kscience.controls.api.LifecycleState
 import space.kscience.dataforge.context.*
 import space.kscience.dataforge.meta.*
 import java.net.InetSocketAddress
@@ -30,7 +31,7 @@ public class ChannelPort(
     meta: Meta,
     coroutineContext: CoroutineContext = context.coroutineContext,
     channelBuilder: suspend () -> ByteChannel,
-) : AbstractAsynchronousPort(context, meta, coroutineContext), AutoCloseable {
+) : AbstractAsynchronousPort(context, meta, coroutineContext) {
 
     /**
      * A handler to await port connection
@@ -41,7 +42,8 @@ public class ChannelPort(
 
     private var listenerJob: Job? = null
 
-    override val isOpen: Boolean get() = listenerJob?.isActive == true
+    override val lifecycleState: LifecycleState
+        get() = if(listenerJob?.isActive == true) LifecycleState.STARTED else LifecycleState.STOPPED
 
     override fun onOpen() {
         listenerJob = scope.launch(Dispatchers.IO) {
@@ -71,12 +73,12 @@ public class ChannelPort(
     }
 
     @OptIn(ExperimentalCoroutinesApi::class)
-    override fun close() {
+    override suspend fun stop() {
         listenerJob?.cancel()
         if (futureChannel.isCompleted) {
             futureChannel.getCompleted().close()
         }
-        super.close()
+        super.stop()
     }
 }
 
@@ -105,12 +107,12 @@ public object TcpPort : Factory<AsynchronousPort> {
     /**
      * Create and open TCP port
      */
-    public fun open(
+    public suspend fun start(
         context: Context,
         host: String,
         port: Int,
         coroutineContext: CoroutineContext = context.coroutineContext,
-    ): ChannelPort = build(context, host, port, coroutineContext).apply { open() }
+    ): ChannelPort = build(context, host, port, coroutineContext).apply { start() }
 
     override fun build(context: Context, meta: Meta): ChannelPort {
         val host = meta["host"].string ?: "localhost"
@@ -156,13 +158,13 @@ public object UdpPort : Factory<AsynchronousPort> {
     /**
      * Connect a datagram channel to a remote host/port. If [localPort] is provided, it is used to bind local port for receiving messages.
      */
-    public fun open(
+    public suspend fun start(
         context: Context,
         remoteHost: String,
         remotePort: Int,
         localPort: Int? = null,
         localHost: String = "localhost",
-    ): ChannelPort = build(context, remoteHost, remotePort, localPort, localHost).apply { open() }
+    ): ChannelPort = build(context, remoteHost, remotePort, localPort, localHost).apply { start() }
 
 
     override fun build(context: Context, meta: Meta): ChannelPort {

controls-core/src/jvmMain/kotlin/space/kscience/controls/ports/UdpSocketPort.kt

@@ -1,6 +1,7 @@
 package space.kscience.controls.ports
 
 import kotlinx.coroutines.*
+import space.kscience.controls.api.LifecycleState
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.meta.Meta
 import java.net.DatagramPacket
@@ -39,13 +40,13 @@ public class UdpSocketPort(
         }
     }
 
-    override fun close() {
+    override suspend fun stop() {
         listenerJob?.cancel()
-        super.close()
+        super.stop()
     }
 
-    override val isOpen: Boolean get() = listenerJob?.isActive == true
+    override val lifecycleState: LifecycleState
-
+        get() = if(listenerJob?.isActive == true) LifecycleState.STARTED else LifecycleState.STOPPED
 
     override suspend fun write(data: ByteArray): Unit = withContext(Dispatchers.IO) {
         val packet = DatagramPacket(

controls-core/src/jvmTest/kotlin/space/kscience/controls/ports/AsynchronousPortIOTest.kt

@@ -29,8 +29,8 @@ internal class AsynchronousPortIOTest {
 
     @Test
     fun testUdpCommunication() = runTest {
-        val receiver = UdpPort.open(Global, "localhost", 8811, localPort = 8812)
+        val receiver = UdpPort.start(Global, "localhost", 8811, localPort = 8812)
-        val sender = UdpPort.open(Global, "localhost", 8812, localPort = 8811)
+        val sender = UdpPort.start(Global, "localhost", 8812, localPort = 8811)
 
         delay(30)
         repeat(10) {
@@ -44,7 +44,7 @@ internal class AsynchronousPortIOTest {
             .toList()
 
         assertEquals("Line number 3", res[3].trim())
-        receiver.close()
+        receiver.stop()
-        sender.close()
+        sender.stop()
     }
 }

controls-magix/src/commonMain/kotlin/space/kscience/controls/client/DeviceClient.kt

@@ -99,10 +99,10 @@ public class DeviceClient internal constructor(
     }
 
     private val lifecycleStateFlow = messageFlow.filterIsInstance<DeviceLifeCycleMessage>()
-        .map { it.state }.stateIn(this, started = SharingStarted.Eagerly, DeviceLifecycleState.STARTED)
+        .map { it.state }.stateIn(this, started = SharingStarted.Eagerly, LifecycleState.STARTED)
 
     @DFExperimental
-    override val lifecycleState: DeviceLifecycleState get() = lifecycleStateFlow.value
+    override val lifecycleState: LifecycleState get() = lifecycleStateFlow.value
 }
 
 /**

controls-pi/src/jvmMain/kotlin/space/kscience/controls/pi/AsynchronousPiPort.kt

@@ -5,6 +5,7 @@ import com.pi4j.io.serial.Serial
 import com.pi4j.io.serial.SerialConfigBuilder
 import com.pi4j.ktx.io.serial
 import kotlinx.coroutines.*
+import space.kscience.controls.api.LifecycleState
 import space.kscience.controls.ports.AbstractAsynchronousPort
 import space.kscience.controls.ports.AsynchronousPort
 import space.kscience.controls.ports.copyToArray
@@ -49,9 +50,10 @@ public class AsynchronousPiPort(
     }
 
 
-    override val isOpen: Boolean get() = listenerJob?.isActive == true
+    override val lifecycleState: LifecycleState
+        get() = if(listenerJob?.isActive == true) LifecycleState.STARTED else LifecycleState.STOPPED
 
-    override fun close() {
+    override suspend fun stop() {
         listenerJob?.cancel()
         serial.close()
     }
@@ -74,11 +76,11 @@ public class AsynchronousPiPort(
             return AsynchronousPiPort(context, meta, serial)
         }
 
-        public fun open(
+        public suspend fun start(
             context: Context,
             device: String,
             block: SerialConfigBuilder.() -> Unit,
-        ): AsynchronousPiPort = build(context, device, block).apply { open() }
+        ): AsynchronousPiPort = build(context, device, block).apply { start() }
 
         override fun build(context: Context, meta: Meta): AsynchronousPort {
             val device: String = meta["device"].string ?: error("Device name not defined")

controls-pi/src/jvmMain/kotlin/space/kscience/controls/pi/SynchronousPiPort.kt

@@ -10,6 +10,7 @@ import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.runInterruptible
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
+import space.kscience.controls.api.LifecycleState
 import space.kscience.controls.ports.SynchronousPort
 import space.kscience.controls.ports.copyToArray
 import space.kscience.dataforge.context.*
@@ -27,11 +28,13 @@ public class SynchronousPiPort(
 ) : SynchronousPort {
 
     private val pi = context.request(PiPlugin)
-    override fun open() {
+
+    override suspend fun start() {
         serial.open()
     }
 
-    override val isOpen: Boolean get() = serial.isOpen
+    override val lifecycleState: LifecycleState
+        get() = if(serial.isOpen) LifecycleState.STARTED else LifecycleState.STOPPED
 
     override suspend fun <R> respond(
         request: ByteArray,
@@ -41,7 +44,7 @@ public class SynchronousPiPort(
         serial.write(request)
         flow<ByteArray> {
             val buffer = ByteBuffer.allocate(1024)
-            while (isOpen) {
+            while (serial.isOpen) {
                 try {
                     val num = serial.read(buffer)
                     if (num > 0) {
@@ -64,7 +67,7 @@ public class SynchronousPiPort(
         }
     }
 
-    override fun close() {
+    override suspend fun stop() {
         serial.close()
     }
 
@@ -86,11 +89,11 @@ public class SynchronousPiPort(
             return SynchronousPiPort(context, meta, serial)
         }
 
-        public fun open(
+        public suspend fun start(
             context: Context,
             device: String,
             block: SerialConfigBuilder.() -> Unit,
-        ): SynchronousPiPort = build(context, device, block).apply { open() }
+        ): SynchronousPiPort = build(context, device, block).apply { start() }
 
         override fun build(context: Context, meta: Meta): SynchronousPiPort {
             val device: String = meta["device"].string ?: error("Device name not defined")

controls-ports-ktor/src/jvmMain/kotlin/space/kscience/controls/ports/KtorTcpPort.kt

@@ -6,9 +6,9 @@ import io.ktor.network.sockets.aSocket
 import io.ktor.network.sockets.openReadChannel
 import io.ktor.network.sockets.openWriteChannel
 import io.ktor.utils.io.consumeEachBufferRange
-import io.ktor.utils.io.core.Closeable
 import io.ktor.utils.io.writeAvailable
 import kotlinx.coroutines.*
+import space.kscience.controls.api.LifecycleState
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.meta.Meta
@@ -25,7 +25,7 @@ public class KtorTcpPort internal constructor(
     public val port: Int,
     coroutineContext: CoroutineContext = context.coroutineContext,
     socketOptions: SocketOptions.TCPClientSocketOptions.() -> Unit = {},
-) : AbstractAsynchronousPort(context, meta, coroutineContext), Closeable {
+) : AbstractAsynchronousPort(context, meta, coroutineContext) {
 
     override fun toString(): String = "port[tcp:$host:$port]"
 
@@ -55,13 +55,13 @@ public class KtorTcpPort internal constructor(
         writeChannel.await().writeAvailable(data)
     }
 
-    override val isOpen: Boolean
+    override val lifecycleState: LifecycleState
-        get() = listenerJob?.isActive == true
+        get() = if(listenerJob?.isActive == true) LifecycleState.STARTED else LifecycleState.STOPPED
 
-    override fun close() {
+    override suspend fun stop() {
         listenerJob?.cancel()
         futureSocket.cancel()
-        super.close()
+        super.stop()
     }
 
     public companion object : Factory<AsynchronousPort> {
@@ -82,13 +82,13 @@ public class KtorTcpPort internal constructor(
             return KtorTcpPort(context, meta, host, port, coroutineContext, socketOptions)
         }
 
-        public fun open(
+        public suspend fun start(
             context: Context,
             host: String,
             port: Int,
             coroutineContext: CoroutineContext = context.coroutineContext,
             socketOptions: SocketOptions.TCPClientSocketOptions.() -> Unit = {},
-        ): KtorTcpPort = build(context, host, port, coroutineContext, socketOptions).apply { open() }
+        ): KtorTcpPort = build(context, host, port, coroutineContext, socketOptions).apply { start() }
 
         override fun build(context: Context, meta: Meta): AsynchronousPort {
             val host = meta["host"].string ?: "localhost"

controls-ports-ktor/src/jvmMain/kotlin/space/kscience/controls/ports/KtorUdpPort.kt

@@ -4,9 +4,9 @@ import io.ktor.network.selector.ActorSelectorManager
 import io.ktor.network.sockets.*
 import io.ktor.utils.io.ByteWriteChannel
 import io.ktor.utils.io.consumeEachBufferRange
-import io.ktor.utils.io.core.Closeable
 import io.ktor.utils.io.writeAvailable
 import kotlinx.coroutines.*
+import space.kscience.controls.api.LifecycleState
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.meta.Meta
@@ -24,7 +24,7 @@ public class KtorUdpPort internal constructor(
     public val localHost: String = "localhost",
     coroutineContext: CoroutineContext = context.coroutineContext,
     socketOptions: SocketOptions.UDPSocketOptions.() -> Unit = {},
-) : AbstractAsynchronousPort(context, meta, coroutineContext), Closeable {
+) : AbstractAsynchronousPort(context, meta, coroutineContext) {
 
     override fun toString(): String = "port[udp:$remoteHost:$remotePort]"
 
@@ -58,13 +58,13 @@ public class KtorUdpPort internal constructor(
         writeChannel.await().writeAvailable(data)
     }
 
-    override val isOpen: Boolean
+    override val lifecycleState: LifecycleState
-        get() = listenerJob?.isActive == true
+        get() = if(listenerJob?.isActive == true) LifecycleState.STARTED else LifecycleState.STOPPED
 
-    override fun close() {
+    override suspend fun stop() {
         listenerJob?.cancel()
         futureSocket.cancel()
-        super.close()
+        super.stop()
     }
 
     public companion object : Factory<AsynchronousPort> {
@@ -101,7 +101,7 @@ public class KtorUdpPort internal constructor(
         /**
          * Create and open UDP port
          */
-        public fun open(
+        public suspend fun start(
             context: Context,
             remoteHost: String,
             remotePort: Int,
@@ -117,7 +117,7 @@ public class KtorUdpPort internal constructor(
             localHost,
             coroutineContext,
             socketOptions
-        ).apply { open() }
+        ).apply { start() }
 
         override fun build(context: Context, meta: Meta): AsynchronousPort {
             val remoteHost by meta.string { error("Remote host is not specified") }

controls-serial/src/jvmMain/kotlin/space/kscience/controls/serial/AsynchronousSerialPort.kt

@@ -5,6 +5,7 @@ import com.fazecast.jSerialComm.SerialPortDataListener
 import com.fazecast.jSerialComm.SerialPortEvent
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import space.kscience.controls.api.LifecycleState
 import space.kscience.controls.ports.AbstractAsynchronousPort
 import space.kscience.controls.ports.AsynchronousPort
 import space.kscience.dataforge.context.Context
@@ -55,18 +56,20 @@ public class AsynchronousSerialPort(
         comPort.addDataListener(serialPortListener)
     }
 
-    override val isOpen: Boolean get() = comPort.isOpen
+    override val lifecycleState: LifecycleState
+        get() = if(comPort.isOpen) LifecycleState.STARTED else LifecycleState.STOPPED
+
 
     override suspend fun write(data: ByteArray) {
         comPort.writeBytes(data, data.size)
     }
 
-    override fun close() {
+    override suspend fun stop() {
         comPort.removeDataListener()
         if (comPort.isOpen) {
             comPort.closePort()
         }
-        super.close()
+        super.stop()
     }
 
     public companion object : Factory<AsynchronousPort> {
@@ -100,7 +103,7 @@ public class AsynchronousSerialPort(
         /**
          * Construct ComPort with given parameters
          */
-        public fun open(
+        public suspend fun start(
             context: Context,
             portName: String,
             baudRate: Int = 9600,
@@ -118,7 +121,7 @@ public class AsynchronousSerialPort(
             parity = parity,
             coroutineContext = coroutineContext,
             additionalConfig = additionalConfig
-        ).apply { open() }
+        ).apply { start() }
 
 
         override fun build(context: Context, meta: Meta): AsynchronousPort {

controls-serial/src/jvmMain/kotlin/space/kscience/controls/serial/SynchronousSerialPort.kt

@@ -7,6 +7,7 @@ import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.runInterruptible
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
+import space.kscience.controls.api.LifecycleState
 import space.kscience.controls.ports.SynchronousPort
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
@@ -28,16 +29,17 @@ public class SynchronousSerialPort(
     override fun toString(): String = "port[${comPort.descriptivePortName}]"
 
 
-    override fun open() {
+    override suspend fun start() {
-        if (!isOpen) {
+        if (!comPort.isOpen) {
             comPort.openPort()
         }
     }
 
-    override val isOpen: Boolean get() = comPort.isOpen
+    override val lifecycleState: LifecycleState
+        get() = if(comPort.isOpen) LifecycleState.STARTED else LifecycleState.STOPPED
 
 
-    override fun close() {
+    override suspend fun stop() {
         if (comPort.isOpen) {
             comPort.closePort()
         }
@@ -52,7 +54,7 @@ public class SynchronousSerialPort(
         comPort.flushIOBuffers()
         comPort.writeBytes(request, request.size)
         flow<ByteArray> {
-            while (isOpen) {
+            while (comPort.isOpen) {
                 try {
                     val available = comPort.bytesAvailable()
                     if (available > 0) {
@@ -108,7 +110,7 @@ public class SynchronousSerialPort(
         /**
          * Construct ComPort with given parameters
          */
-        public fun open(
+        public suspend fun start(
             context: Context,
             portName: String,
             baudRate: Int = 9600,
@@ -124,7 +126,7 @@ public class SynchronousSerialPort(
             stopBits = stopBits,
             parity = parity,
             additionalConfig = additionalConfig
-        ).apply { open() }
+        ).apply { start() }
 
 
         override fun build(context: Context, meta: Meta): SynchronousPort {

demo/mks-pdr900/src/main/kotlin/center/sciprog/devices/mks/MksPdr900Device.kt

@@ -99,9 +99,9 @@ class MksPdr900Device(context: Context, meta: Meta) : DeviceBySpec<MksPdr900Devi
         val error by logicalProperty(MetaConverter.string)
 
 
-        override fun MksPdr900Device.onClose() {
+        override suspend fun MksPdr900Device.onClose() {
             if (portDelegate.isInitialized()) {
-                port.close()
+                port.stop()
             }
         }
     }

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

@@ -168,7 +168,7 @@ class PiMotionMasterDevice(
             }
             //Update port
             //address = portSpec.node
-            port = portFactory(portSpec, context).apply { open() }
+            port = portFactory(portSpec, context).apply { start() }
 //        connector.open()
             //Initialize axes
             val idn = read(identity)
@@ -190,7 +190,7 @@ class PiMotionMasterDevice(
         }) {
             port?.let {
                 execute(stop)
-                it.close()
+                it.stop()
             }
             port = null
             propertyChanged(connected, false)

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

@@ -6,6 +6,7 @@ import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import space.kscience.controls.api.AsynchronousSocket
+import space.kscience.controls.api.LifecycleState
 import space.kscience.controls.ports.AbstractAsynchronousPort
 import space.kscience.controls.ports.withDelimiter
 import space.kscience.dataforge.context.*
@@ -48,10 +49,10 @@ abstract class VirtualDevice(val scope: CoroutineScope) : AsynchronousSocket<Byt
         respond(response())
     }
 
-    override val isOpen: Boolean
+    override val lifecycleState: LifecycleState
-        get() = scope.isActive
+        get() = if(scope.isActive) LifecycleState.STARTED else LifecycleState.STOPPED
 
-    override fun close() = scope.cancel()
+    override suspend fun stop() = scope.cancel()
 }
 
 class VirtualPort(private val device: VirtualDevice, context: Context) : AbstractAsynchronousPort(context, Meta.EMPTY) {
@@ -72,12 +73,12 @@ class VirtualPort(private val device: VirtualDevice, context: Context) : Abstrac
         device.send(data)
     }
 
-    override val isOpen: Boolean
+    override val lifecycleState: LifecycleState
-        get() = respondJob?.isActive == true
+        get() = if(respondJob?.isActive == true) LifecycleState.STARTED else LifecycleState.STOPPED
 
-    override fun close() {
+    override suspend fun stop() {
         respondJob?.cancel()
-        super.close()
+        super.stop()
     }
 }
 
@@ -88,7 +89,7 @@ class PiMotionMasterVirtualDevice(
     scope: CoroutineScope = context,
 ) : VirtualDevice(scope), ContextAware {
 
-    override fun open() {
+    override suspend fun start() {
         //add asynchronous send logic here
     }