Merge pull request #72

Kotlin 1.6

build.gradle.kts

@@ -4,7 +4,10 @@ plugins {
 
 allprojects {
     group = "space.kscience"
-    version = "0.5.1"
+    version = "0.5.2-dev-1"
+    repositories{
+        mavenCentral()
+    }
 }
 
 subprojects {
@@ -22,8 +25,5 @@ ksciencePublish {
 }
 
 apiValidation {
-    if(project.version.toString().contains("dev")) {
-        validationDisabled = true
-    }
     nonPublicMarkers.add("space.kscience.dataforge.misc.DFExperimental")
 }

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/Context.kt

@@ -4,6 +4,7 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
 import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.misc.Named
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.provider.Provider
@@ -71,16 +72,16 @@ public open class Context internal constructor(
     private val childrenContexts = HashMap<Name, Context>()
 
     /**
-     * Build and register a child context
+     * Get and validate existing context or build and register a new child context.
+     * @param name the relative (tail) name of the new context. If null, uses context hash code as a marker.
      */
+    @OptIn(DFExperimental::class)
     @Synchronized
-    public fun buildContext(name: String? = null, block: ContextBuilder.() -> Unit = {}): Context {
-        val newContext = ContextBuilder(this)
-            .apply { name?.let { name(it) } }
-            .apply(block)
-            .build()
-        childrenContexts[newContext.name] = newContext
-        return newContext
+    public fun buildContext(name: Name? = null, block: ContextBuilder.() -> Unit = {}): Context {
+        val existing = name?.let { childrenContexts[name] }
+        return  existing?.modify(block)?: ContextBuilder(this, name).apply(block).build().also {
+            childrenContexts[it.name] = it
+        }
     }
 
     /**

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/ContextBuilder.kt

@@ -20,7 +20,7 @@ import kotlin.collections.set
 @DFBuilder
 public class ContextBuilder internal constructor(
     private val parent: Context,
-    public var name: Name? = null,
+    public val name: Name? = null,
     meta: Meta = Meta.EMPTY,
 ) {
     internal val factories = HashMap<PluginFactory<*>, Meta>()
@@ -30,10 +30,6 @@ public class ContextBuilder internal constructor(
         meta.action()
     }
 
-    public fun name(string: String) {
-        this.name = Name.parse(string)
-    }
-
     @OptIn(DFExperimental::class)
     private fun findPluginFactory(tag: PluginTag): PluginFactory<*> =
         parent.gatherInSequence<PluginFactory<*>>(PluginFactory.TYPE).values
@@ -95,19 +91,21 @@ public class ContextBuilder internal constructor(
 }
 
 /**
- * Check if current context contains all plugins required by the builder and return it it does or forks to a new context
+ * Check if current context contains all plugins required by the builder and return it does or forks to a new context
  * if it does not.
  */
-public fun Context.withEnv(block: ContextBuilder.() -> Unit): Context {
+@DFExperimental
+public fun Context.modify(block: ContextBuilder.() -> Unit): Context {
 
     fun Context.contains(factory: PluginFactory<*>, meta: Meta): Boolean {
         val loaded = plugins[factory.tag] ?: return false
         return loaded.meta == meta
     }
 
-    val builder = ContextBuilder(this, name + "env", properties).apply(block)
+    val builder = ContextBuilder(this, name + "mod", properties).apply(block)
     val requiresFork = builder.factories.any { (factory, meta) ->
         !contains(factory, meta)
     } || ((properties as Meta) == builder.meta)
+
     return if (requiresFork) builder.build() else this
 }

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/Global.kt

@@ -3,11 +3,13 @@ package space.kscience.dataforge.context
 import kotlinx.coroutines.CoroutineName
 import kotlinx.coroutines.Job
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.Name.Companion.parse
 import space.kscience.dataforge.names.asName
 import kotlin.coroutines.CoroutineContext
 import kotlin.native.concurrent.ThreadLocal
 
-internal expect val globalLoggerFactory: PluginFactory<out LogManager>
+internal expect fun getGlobalLoggerFactory(): PluginFactory<out LogManager>
 
 /**
  * A global root context. Closing [Global] terminates the framework.
@@ -20,4 +22,4 @@ private object GlobalContext : Context("GLOBAL".asName(), null, emptySet(), Meta
 public val Global: Context get() = GlobalContext
 
 public fun Context(name: String? = null, block: ContextBuilder.() -> Unit = {}): Context =
-    Global.buildContext(name, block)
+    Global.buildContext(name?.let(Name::parse), block)

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/LogManager.kt

@@ -75,7 +75,7 @@ public class DefaultLogManager : AbstractPlugin(), LogManager {
  */
 public val Context.logger: LogManager
     get() = plugins.find(inherit = true) { it is LogManager } as? LogManager
-        ?: globalLoggerFactory(context = Global).apply { attach(Global) }
+        ?: getGlobalLoggerFactory()(context = Global).apply { attach(Global) }
 
 /**
  * The named proxy logger for a context member

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/PluginManager.kt

@@ -1,6 +1,7 @@
 package space.kscience.dataforge.context
 
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.names.plus
 import kotlin.reflect.KClass
 
 
@@ -84,7 +85,7 @@ public inline fun <reified T : Plugin> Context.fetch(factory: PluginFactory<T>,
     val existing = plugins[factory]
     return if (existing != null && existing.meta == meta) existing
     else {
-        buildContext {
+        buildContext(name = this@fetch.name + factory.tag.name) {
             plugin(factory, meta)
         }.plugins[factory]!!
     }

dataforge-context/src/commonTest/kotlin/space/kscience/dataforge/context/ContextTest.kt

@@ -20,8 +20,7 @@ class ContextTest {
 
     @Test
     fun testPluginManager() {
-        val context = Global.buildContext {
-            name("test")
+        val context = Context("test") {
             plugin(DummyPlugin())
         }
         val members = context.gather<Name>("test")

dataforge-context/src/jsMain/kotlin/space/kscience/dataforge/context/loggingJs.kt

@@ -29,4 +29,4 @@ public class ConsoleLogManager : AbstractPlugin(), LogManager {
     }
 }
 
-internal actual val globalLoggerFactory: PluginFactory<out LogManager> = ConsoleLogManager
+internal actual fun getGlobalLoggerFactory(): PluginFactory<out LogManager> = ConsoleLogManager

dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/context/loggingJvm.kt

@@ -31,4 +31,4 @@ public class SlfLogManager : AbstractPlugin(), LogManager {
     }
 }
 
-internal actual val globalLoggerFactory: PluginFactory<out LogManager> = SlfLogManager
+internal actual fun getGlobalLoggerFactory(): PluginFactory<out LogManager> = SlfLogManager

dataforge-context/src/nativeMain/kotlin/space/kscience/dataforge/context/loggingNative.kt

@@ -1,4 +1,4 @@
 package space.kscience.dataforge.context
 
 
-internal actual val globalLoggerFactory: PluginFactory<out LogManager> = DefaultLogManager
+internal actual fun getGlobalLoggerFactory(): PluginFactory<out LogManager> = DefaultLogManager

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSet.kt

@@ -32,7 +32,7 @@ public interface DataSet<out T : Any> {
      */
     public suspend fun listTop(prefix: Name = Name.EMPTY): List<Name> =
         flow().map { it.name }.filter { it.startsWith(prefix) && (it.length == prefix.length + 1) }.toList()
-    // By default traverses the whole tree. Could be optimized in descendants
+    // By default, traverses the whole tree. Could be optimized in descendants
 
     public companion object {
         public val META_KEY: Name = "@meta".asName()
@@ -43,7 +43,7 @@ public interface DataSet<out T : Any> {
         public val EMPTY: DataSet<Nothing> = object : DataSet<Nothing> {
             override val dataType: KType = TYPE_OF_NOTHING
 
-            private val nothing: Nothing get() = error("this is nothing")
+            //private val nothing: Nothing get() = error("this is nothing")
 
             override fun flow(): Flow<NamedData<Nothing>> = emptyFlow()
 

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/Goal.kt

@@ -1,7 +1,6 @@
 package space.kscience.dataforge.data
 
 import kotlinx.coroutines.*
-import space.kscience.dataforge.misc.DFExperimental
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
 
@@ -67,7 +66,6 @@ public open class LazyGoal<T>(
      * If [GoalExecutionRestriction] is present in the [coroutineScope] context, the call could produce a error a warning
      * depending on the settings.
      */
-    @DFExperimental
     override fun async(coroutineScope: CoroutineScope): Deferred<T> {
         val log = coroutineScope.coroutineContext[GoalLogger]
         // Check if context restricts goal computation

dataforge-data/src/jvmMain/kotlin/space/kscience/dataforge/data/select.kt

@@ -3,6 +3,7 @@ package space.kscience.dataforge.data
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.map
+import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.matches
@@ -16,48 +17,65 @@ import kotlin.reflect.typeOf
  */
 @Suppress("UNCHECKED_CAST")
 private fun <R : Any> Data<*>.castOrNull(type: KType): Data<R>? =
-    if (!this.type.isSubtypeOf(type)) null else object : Data<R> by (this as Data<R>) {
+    if (!this.type.isSubtypeOf(type)) {
+        null
+    } else {
+        object : Data<R> by (this as Data<R>) {
             override val type: KType = type
         }
+    }
 
 /**
  * Select all data matching given type and filters. Does not modify paths
+ *
+ * @param namePattern a name match patter according to [Name.matches]
+ * @param filter addition filtering condition based on item name and meta. By default, accepts all
  */
 @OptIn(DFExperimental::class)
-@PublishedApi
-internal fun <R : Any> DataSet<*>.select(
+public fun <R : Any> DataSet<*>.select(
     type: KType,
     namePattern: Name? = null,
+    filter: (name: Name, meta: Meta) -> Boolean = { _, _ -> true }
 ): ActiveDataSet<R> = object : ActiveDataSet<R> {
     override val dataType = type
 
+    private fun checkDatum(name: Name, datum: Data<*>): Boolean = datum.type.isSubtypeOf(type)
+            && (namePattern == null || name.matches(namePattern))
+            && filter(name, datum.meta)
 
-    override fun flow(): Flow<NamedData<R>> = this@select.flow().filter { datum ->
-        datum.type.isSubtypeOf(type) && (namePattern == null || datum.name.matches(namePattern))
+    override fun flow(): Flow<NamedData<R>> = this@select.flow().filter {
+        checkDatum(it.name, it.data)
     }.map {
         @Suppress("UNCHECKED_CAST")
         it as NamedData<R>
     }
 
-    override suspend fun getData(name: Name): Data<R>? = this@select.getData(name)?.castOrNull(type)
-
-    override val updates: Flow<Name> = this@select.updates.filter {
-        val datum = this@select.getData(it)
-        datum?.type?.isSubtypeOf(type) ?: false
+    override suspend fun getData(name: Name): Data<R>? = this@select.getData(name)?.let { datum ->
+        if (checkDatum(name, datum)) datum.castOrNull(type) else null
     }
 
+    override val updates: Flow<Name> = this@select.updates.filter {
+        val datum = this@select.getData(it) ?: return@filter false
+        checkDatum(it, datum)
+    }
 }
 
 /**
  * Select a single datum of the appropriate type
  */
-public inline fun <reified R : Any> DataSet<*>.select(namePattern: Name? = null): DataSet<R> =
-    select(typeOf<R>(), namePattern)
+public inline fun <reified R : Any> DataSet<*>.select(
+    namePattern: Name? = null,
+    noinline filter: (name: Name, meta: Meta) -> Boolean = { _, _ -> true }
+): DataSet<R> = select(typeOf<R>(), namePattern, filter)
 
+/**
+ * Select a single datum if it is present and of given [type]
+ */
 public suspend fun <R : Any> DataSet<*>.selectOne(type: KType, name: Name): NamedData<R>? =
     getData(name)?.castOrNull<R>(type)?.named(name)
 
-public suspend inline fun <reified R : Any> DataSet<*>.selectOne(name: Name): NamedData<R>? = selectOne(typeOf<R>(), name)
+public suspend inline fun <reified R : Any> DataSet<*>.selectOne(name: Name): NamedData<R>? =
+    selectOne(typeOf<R>(), name)
 
 public suspend inline fun <reified R : Any> DataSet<*>.selectOne(name: String): NamedData<R>? =
     selectOne(typeOf<R>(), Name.parse(name))

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOPlugin.kt

@@ -10,8 +10,7 @@ import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.names.Name
-
-import kotlin.native.concurrent.ThreadLocal
+import space.kscience.dataforge.names.asName
 import kotlin.reflect.KClass
 
 public class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
@@ -75,10 +74,11 @@ public class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
     }
 }
 
-@ThreadLocal
-internal val ioContext = Global.withEnv {
-    name("IO")
+public val Context.io: IOPlugin
+    get() = if (this == Global) {
+        Global.buildContext("IO".asName()) {
             plugin(IOPlugin)
+        }.fetch(IOPlugin)
+    } else {
+        fetch(IOPlugin)
     }
-
-public val Context.io: IOPlugin get() = (if (this == Global) ioContext else this).fetch(IOPlugin)

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaggedEnvelopeFormat.kt

@@ -161,7 +161,7 @@ public class TaggedEnvelopeFormat(
             }
         }
 
-        private val default by lazy { invoke(context = ioContext) }
+        private val default by lazy { invoke() }
 
         override fun readPartial(input: Input): PartialEnvelope =
             default.run { readPartial(input) }

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaglessEnvelopeFormat.kt

@@ -193,11 +193,9 @@ public class TaglessEnvelopeFormat(
 
         override val name: Name = TAGLESS_ENVELOPE_TYPE.asName()
 
-        override fun invoke(meta: Meta, context: Context): EnvelopeFormat {
-            return TaglessEnvelopeFormat(context.io, meta)
-        }
+        override fun invoke(meta: Meta, context: Context): EnvelopeFormat = TaglessEnvelopeFormat(context.io, meta)
 
-        private val default by lazy { invoke(context = ioContext) }
+        private val default by lazy { invoke() }
 
         override fun readPartial(input: Input): PartialEnvelope =
             default.run { readPartial(input) }

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Scheme.kt

@@ -123,7 +123,6 @@ public open class Scheme : Described, MetaRepr, MutableMetaProvider, Configurabl
             TODO("Not yet implemented")
         }
 
-
     }
 }
 

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/values/Value.kt

@@ -166,9 +166,7 @@ public class EnumValue<E : Enum<*>>(override val value: E) : Value {
 
     override fun toString(): String = value.toString()
 
-    override fun equals(other: Any?): Boolean {
-        return string == (other as? Value)?.string
-    }
+    override fun equals(other: Any?): Boolean = string == (other as? Value)?.string
 
     override fun hashCode(): Int = value.hashCode()
 }

dataforge-meta/src/commonTest/kotlin/space/kscience/dataforge/meta/MetaSerializationTest.kt

@@ -0,0 +1,16 @@
+package space.kscience.dataforge.meta
+
+import kotlinx.serialization.json.Json
+import space.kscience.dataforge.values.string
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class MetaSerializationTest {
+
+    @Test
+    fun singleValueDeserialization(){
+        val string = "ddd"
+        val meta = Json.decodeFromString(MetaSerializer, string)
+        assertEquals(string, meta.value?.string)
+    }
+}

dataforge-scripting/src/jvmTest/kotlin/space/kscience/dataforge/scripting/BuildersKtTest.kt

@@ -15,7 +15,7 @@ class BuildersKtTest {
         Workspace(Global){
             println("I am working")
 
-            context { name("test") }
+            //context { name("test") }
 
             target("testTarget") {
                 "a" put 12
@@ -28,8 +28,6 @@ class BuildersKtTest {
         val script = """
             println("I am working")
 
-            context{ name("test") }
-
             target("testTarget"){
                 "a" put 12
             }

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/SimpleWorkspace.kt

@@ -17,7 +17,7 @@ public class SimpleWorkspace(
     private val externalTasks: Map<Name, Task<*>>,
 ) : Workspace {
 
-    override val data: TaskResult<*> = internalize(data, Name.EMPTY, Meta.EMPTY)
+    override val data: TaskResult<*> = wrapResult(data, Name.EMPTY, Meta.EMPTY)
 
     override val tasks: Map<Name, Task<*>>
         get() = context.gather<Task<*>>(Task.TYPE) + externalTasks

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt

@@ -28,7 +28,7 @@ public interface Task<out T : Any> : Described {
     public suspend fun execute(workspace: Workspace, taskName: Name, taskMeta: Meta): TaskResult<T>
 
     public companion object {
-        public const val TYPE: String = "workspace.stage"
+        public const val TYPE: String = "workspace.task"
     }
 }
 
@@ -42,6 +42,10 @@ public class TaskResultBuilder<T : Any>(
 /**
  * Create a [Task] that composes a result using [builder]. Only data from the workspace could be used.
  * Data dependency cycles are not allowed.
+ *
+ * @param resultType the type boundary for data produced by this task
+ * @param descriptor of meta accepted by this task
+ * @param builder for resulting data set
  */
 @Suppress("FunctionName")
 @DFInternal
@@ -62,7 +66,7 @@ public fun <T : Any> Task(
         val dataset = DataTree<T>(resultType) {
             TaskResultBuilder(workspace, taskName, taskMeta, this).apply { builder() }
         }
-        workspace.internalize(dataset, taskName, taskMeta)
+        workspace.wrapResult(dataset, taskName, taskMeta)
     }
 }
 

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/TaskData.kt

@@ -42,6 +42,6 @@ private class TaskDataImpl<out T : Any>(
 //    }
 }
 
-internal fun <T : Any> Workspace.internalize(data: Data<T>, name: Name, stage: Name, stageMeta: Meta): TaskData<T> =
-    TaskDataImpl(this, data, name, stage, stageMeta)
+public fun <T : Any> Workspace.wrapData(data: Data<T>, name: Name, taskName: Name, stageMeta: Meta): TaskData<T> =
+    TaskDataImpl(this, data, name, taskName, stageMeta)
 

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/TaskResult.kt

@@ -37,13 +37,16 @@ private class TaskResultImpl<out T : Any>(
 ) : TaskResult<T>, DataSet<T> by dataSet {
 
     override fun flow(): Flow<TaskData<T>> = dataSet.flow().map {
-        workspace.internalize(it, it.name, taskName, taskMeta)
+        workspace.wrapData(it, it.name, taskName, taskMeta)
     }
 
     override suspend fun getData(name: Name): TaskData<T>? = dataSet.getData(name)?.let {
-        workspace.internalize(it, name, taskName, taskMeta)
+        workspace.wrapData(it, name, taskName, taskMeta)
     }
 }
 
-internal fun <T : Any> Workspace.internalize(dataSet: DataSet<T>, stage: Name, stageMeta: Meta): TaskResult<T> =
-    TaskResultImpl(this, dataSet, stage, stageMeta)
+/**
+ * Wrap data into [TaskResult]
+ */
+public fun <T : Any> Workspace.wrapResult(dataSet: DataSet<T>, taskName: Name, taskMeta: Meta): TaskResult<T> =
+    TaskResultImpl(this, dataSet, taskName, taskMeta)

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Workspace.kt

@@ -1,6 +1,7 @@
 package space.kscience.dataforge.workspace
 
 import space.kscience.dataforge.context.ContextAware
+import space.kscience.dataforge.data.DataSet
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.misc.Type
@@ -8,6 +9,10 @@ import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.provider.Provider
 
 
+public interface DataSelector<T: Any>{
+    public suspend fun select(workspace: Workspace, meta: Meta): DataSet<T>
+}
+
 @Type(Workspace.TYPE)
 public interface Workspace : ContextAware, Provider {
     /**

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt

@@ -14,10 +14,22 @@ import space.kscience.dataforge.meta.descriptors.MetaDescriptorBuilder
 import space.kscience.dataforge.misc.DFBuilder
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.asName
 import kotlin.properties.PropertyDelegateProvider
 import kotlin.properties.ReadOnlyProperty
 
-public data class TaskReference<T: Any>(public val taskName: Name, public val task: Task<T>)
+public data class TaskReference<T: Any>(public val taskName: Name, public val task: Task<T>): DataSelector<T>{
+
+    @Suppress("UNCHECKED_CAST")
+    override suspend fun select(workspace: Workspace, meta: Meta): DataSet<T> {
+        if (workspace.tasks[taskName] == task) {
+            return workspace.produce(taskName, meta) as TaskResult<T>
+        } else {
+            error("Task $taskName does not belong to the workspace")
+        }
+    }
+
+}
 
 public interface TaskContainer {
     public fun registerTask(taskName: Name, task: Task<*>)
@@ -51,7 +63,7 @@ public class WorkspaceBuilder(private val parentContext: Context = Global) : Tas
      * Define a context for the workspace
      */
     public fun context(block: ContextBuilder.() -> Unit = {}) {
-        this.context = parentContext.buildContext("workspace", block)
+        this.context = parentContext.buildContext("workspace".asName(), block)
     }
 
     /**

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt

@@ -0,0 +1,45 @@
+package space.kscience.dataforge.workspace
+
+import space.kscience.dataforge.data.DataSet
+import space.kscience.dataforge.data.forEach
+import space.kscience.dataforge.data.map
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.toMutableMeta
+import space.kscience.dataforge.misc.DFExperimental
+import space.kscience.dataforge.names.Name
+
+/**
+ * Select data using given [selector]
+ */
+public suspend fun <T : Any> TaskResultBuilder<*>.from(
+    selector: DataSelector<T>,
+): DataSet<T> = selector.select(workspace, taskMeta)
+
+public val TaskResultBuilder<*>.allData: DataSelector<*>
+    get() = object : DataSelector<Any> {
+        override suspend fun select(workspace: Workspace, meta: Meta): DataSet<Any> = workspace.data
+    }
+
+/**
+ * Perform a lazy mapping task using given [selector] and [action]. The meta of resulting
+ * TODO move selector to receiver with multi-receivers
+ */
+@DFExperimental
+public suspend inline fun <T : Any, reified R : Any> TaskResultBuilder<R>.pipeFrom(
+    selector: DataSelector<T>,
+    crossinline action: suspend (arg: T, name: Name, meta: Meta) -> R
+) {
+    from(selector).forEach { data ->
+        val meta = data.meta.toMutableMeta().apply {
+            taskName put taskMeta
+        }
+
+        val res = data.map(workspace.context.coroutineContext, meta) {
+            action(it, data.name, meta)
+        }
+
+        emit(data.name, res)
+    }
+}
+
+

dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt

@@ -1,24 +0,0 @@
-package space.kscience.dataforge.workspace
-
-import space.kscience.dataforge.data.DataSet
-import space.kscience.dataforge.data.select
-import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.names.Name
-
-public suspend inline fun <reified T : Any> TaskResultBuilder<T>.from(
-    task: Name,
-    taskMeta: Meta = Meta.EMPTY,
-): DataSet<T> = workspace.produce(task, taskMeta).select()
-
-
-@Suppress("UNCHECKED_CAST")
-public suspend fun <R : Any> TaskResultBuilder<*>.from(
-    reference: TaskReference<R>,
-    taskMeta: Meta = Meta.EMPTY,
-): DataSet<R> {
-    if (workspace.tasks[reference.taskName] == reference.task) {
-        return workspace.produce(reference.taskName, taskMeta) as TaskResult<R>
-    } else {
-        throw error("Task ${reference.taskName} does not belong to the workspace")
-    }
-}

dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/workspaceExtensions.kt

@@ -1,8 +0,0 @@
-package space.kscience.dataforge.workspace
-
-import kotlinx.coroutines.runBlocking
-import space.kscience.dataforge.data.DataSetBuilder
-
-public fun WorkspaceBuilder.data(builder: suspend DataSetBuilder<Any>.() -> Unit): Unit = runBlocking {
-    buildData(builder)
-}

dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/workspaceJvm.kt

@@ -0,0 +1,21 @@
+package space.kscience.dataforge.workspace
+
+import kotlinx.coroutines.runBlocking
+import space.kscience.dataforge.data.DataSet
+import space.kscience.dataforge.data.DataSetBuilder
+import space.kscience.dataforge.data.select
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.names.Name
+
+public fun WorkspaceBuilder.data(builder: suspend DataSetBuilder<Any>.() -> Unit): Unit = runBlocking {
+    buildData(builder)
+}
+
+public inline fun <reified T: Any> TaskResultBuilder<*>.selectData(namePattern: Name? = null): DataSelector<T> = object : DataSelector<T> {
+    override suspend fun select(workspace: Workspace, meta: Meta): DataSet<T> = workspace.data.select(namePattern)
+}
+
+public suspend inline fun <reified T : Any> TaskResultBuilder<*>.from(
+    task: Name,
+    taskMeta: Meta = Meta.EMPTY,
+): DataSet<T> = workspace.produce(task, taskMeta).select()

dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt

@@ -71,21 +71,32 @@ class SimpleWorkspaceTest {
         }
 
         val square by task<Int> {
-            workspace.data.select<Int>().forEach { data ->
-                if (data.meta["testFlag"].boolean == true) {
+            pipeFrom(selectData<Int>()) { arg, name, meta ->
+                if (meta["testFlag"].boolean == true) {
                     println("flag")
                 }
-                val value = data.await()
-                workspace.logger.info { "Starting square on $value" }
-                emit(data.name, data.map { it * it })
+                workspace.logger.info { "Starting square on $name" }
+                arg * arg
             }
+//            workspace.data.select<Int>().forEach { data ->
+//                if (data.meta["testFlag"].boolean == true) {
+//                    println("flag")
+//                }
+//                val value = data.await()
+//                workspace.logger.info { "Starting square on $value" }
+//                emit(data.name, data.map { it * it })
+//            }
         }
 
         val linear by task<Int> {
-            workspace.data.select<Int>().forEach { data ->
-                workspace.logger.info { "Starting linear on $data" }
-                emit(data.name, data.data.map { it * 2 + 1 })
+            pipeFrom(selectData<Int>()) { arg, name, _ ->
+                workspace.logger.info { "Starting linear on $name" }
+                arg * 2 + 1
             }
+//            workspace.data.select<Int>().forEach { data ->
+//                workspace.logger.info { "Starting linear on $data" }
+//                emit(data.name, data.data.map { it * 2 + 1 })
+//            }
         }
 
         val fullSquare by task<Int> {

gradle.properties

@@ -4,6 +4,6 @@ org.gradle.parallel=true
 kotlin.code.style=official
 kotlin.parallel.tasks.in.project=true
 
-kotlin.mpp.enableGranularSourceSetsMetadata=true
-kotlin.native.enableDependencyPropagation=false
+#kotlin.mpp.enableGranularSourceSetsMetadata=true
+#kotlin.native.enableDependencyPropagation=false
 kotlin.mpp.stability.nowarn=true

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

settings.gradle.kts

@@ -5,7 +5,7 @@ pluginManagement {
         gradlePluginPortal()
     }
 
-    val toolsVersion = "0.10.2"
+    val toolsVersion = "0.10.4"
 
     plugins {
         id("ru.mipt.npm.gradle.project") version toolsVersion