From 4117a05df40e743cca2bb7a2c827646c802d4438 Mon Sep 17 00:00:00 2001
From: Alexander Nozik <altavir@gmail.com>
Date: Mon, 3 Oct 2022 20:36:28 +0300
Subject: [PATCH] Add in-memory caching for workspaces

---
 build.gradle.kts                              | 21 +++++--
 dataforge-context/build.gradle.kts            |  2 +-
 dataforge-data/build.gradle.kts               |  2 +-
 .../space/kscience/dataforge/data/DataSet.kt  |  5 ++
 .../kscience/dataforge/data/dataTransform.kt  |  3 +-
 dataforge-io/build.gradle.kts                 |  2 +-
 dataforge-meta/build.gradle.kts               |  2 +-
 .../dataforge/meta/ObservableMetaWrapper.kt   |  4 +-
 .../kscience/dataforge/meta/SealedMeta.kt     | 10 +++-
 dataforge-workspace/build.gradle.kts          |  7 ++-
 .../kscience/dataforge/workspace/Task.kt      |  5 ++
 .../kscience/dataforge/workspace/TaskData.kt  |  4 +-
 .../kscience/dataforge/workspace/Workspace.kt |  5 +-
 .../{SimpleWorkspace.kt => WorkspaceBase.kt}  |  8 ++-
 .../dataforge/workspace/WorkspaceBuilder.kt   | 12 +++-
 .../dataforge/workspace/WorkspaceCache.kt     | 38 +++++++++++++
 .../dataforge/workspace/WorkspacePlugin.kt    |  0
 .../dataforge/workspace/taskBuilders.kt       | 28 +++++++++-
 .../dataforge/workspace/workspaceJvm.kt       |  3 +
 .../workspace/CachingWorkspaceTest.kt         | 46 +++++++++++++++
 .../workspace/SimpleWorkspaceTest.kt          | 56 +++++++++----------
 gradle.properties                             |  2 +-
 gradle/wrapper/gradle-wrapper.properties      |  2 +-
 23 files changed, 210 insertions(+), 57 deletions(-)
 rename dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/{SimpleWorkspace.kt => WorkspaceBase.kt} (60%)
 create mode 100644 dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceCache.kt
 rename dataforge-workspace/src/{jvmMain => commonMain}/kotlin/space/kscience/dataforge/workspace/WorkspacePlugin.kt (100%)
 create mode 100644 dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/CachingWorkspaceTest.kt

diff --git a/build.gradle.kts b/build.gradle.kts
index 6ec0833c..7ffa0076 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,4 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+import space.kscience.gradle.isInDevelopment
+import space.kscience.gradle.useApache2Licence
+import space.kscience.gradle.useSPCTeam
 
 plugins {
     id("space.kscience.gradle.project")
@@ -12,8 +15,8 @@ allprojects {
 subprojects {
     apply(plugin = "maven-publish")
 
-    tasks.withType<KotlinCompile>{
-        kotlinOptions{
+    tasks.withType<KotlinCompile> {
+        kotlinOptions {
             freeCompilerArgs = freeCompilerArgs + "-Xcontext-receivers"
         }
     }
@@ -24,8 +27,18 @@ readme {
 }
 
 ksciencePublish {
-    github("dataforge-core")
-    space("https://maven.pkg.jetbrains.space/mipt-npm/p/sci/maven")
+    pom("https://github.com/SciProgCentre/kmath") {
+        useApache2Licence()
+        useSPCTeam()
+    }
+    github("dataforge-core", "SciProgCentre")
+    space(
+        if (isInDevelopment) {
+            "https://maven.pkg.jetbrains.space/mipt-npm/p/sci/dev"
+        } else {
+            "https://maven.pkg.jetbrains.space/mipt-npm/p/sci/release"
+        }
+    )
     sonatype()
 }
 
diff --git a/dataforge-context/build.gradle.kts b/dataforge-context/build.gradle.kts
index 056d5590..b0e8f402 100644
--- a/dataforge-context/build.gradle.kts
+++ b/dataforge-context/build.gradle.kts
@@ -1,11 +1,11 @@
 plugins {
     id("space.kscience.gradle.mpp")
-    id("space.kscience.gradle.native")
 }
 
 description = "Context and provider definitions"
 
 kscience {
+    native()
     useCoroutines()
 }
 
diff --git a/dataforge-data/build.gradle.kts b/dataforge-data/build.gradle.kts
index 9af661f9..b3b6583b 100644
--- a/dataforge-data/build.gradle.kts
+++ b/dataforge-data/build.gradle.kts
@@ -1,9 +1,9 @@
 plugins {
     id("space.kscience.gradle.mpp")
-    id("space.kscience.gradle.native")
 }
 
 kscience{
+    native()
     useCoroutines()
 }
 
diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSet.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSet.kt
index cf327c9b..72e4eb38 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSet.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSet.kt
@@ -56,6 +56,11 @@ public fun <T : Any> DataSet<T>.asSequence(): Sequence<NamedData<T>> = object :
     override fun iterator(): Iterator<NamedData<T>> = this@asSequence.iterator()
 }
 
+/**
+ * Return a single [Data] in this [DataSet]. Throw error if it is not single.
+ */
+public fun <T : Any> DataSet<T>.single(): NamedData<T> = asSequence().single()
+
 public fun <T : Any> DataSet<T>.asIterable(): Iterable<NamedData<T>> = object : Iterable<NamedData<T>> {
     override fun iterator(): Iterator<NamedData<T>> = this@asIterable.iterator()
 }
diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataTransform.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataTransform.kt
index 6d683f12..76577346 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataTransform.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataTransform.kt
@@ -1,6 +1,5 @@
 package space.kscience.dataforge.data
 
-import kotlinx.coroutines.flow.map
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.meta.seal
@@ -37,7 +36,7 @@ public inline fun <T : Any, reified R : Any> Data<T>.map(
 }
 
 /**
- * Combine this data with the other data using [block]. See [map] for other details
+ * Combine this data with the other data using [block]. See [Data::map] for other details
  */
 public inline fun <T1 : Any, T2 : Any, reified R : Any> Data<T1>.combine(
     other: Data<T2>,
diff --git a/dataforge-io/build.gradle.kts b/dataforge-io/build.gradle.kts
index 3d6ff062..1ee69734 100644
--- a/dataforge-io/build.gradle.kts
+++ b/dataforge-io/build.gradle.kts
@@ -2,12 +2,12 @@ import space.kscience.gradle.KScienceVersions
 
 plugins {
     id("space.kscience.gradle.mpp")
-    id("space.kscience.gradle.native")
 }
 
 description = "IO module"
 
 kscience {
+    native()
     useSerialization(sourceSet = space.kscience.gradle.DependencySourceSet.TEST) {
         cbor()
     }
diff --git a/dataforge-meta/build.gradle.kts b/dataforge-meta/build.gradle.kts
index 4252de77..95c062ec 100644
--- a/dataforge-meta/build.gradle.kts
+++ b/dataforge-meta/build.gradle.kts
@@ -1,9 +1,9 @@
 plugins {
     id("space.kscience.gradle.mpp")
-    id("space.kscience.gradle.native")
 }
 
 kscience {
+    native()
     useSerialization{
         json()
     }
diff --git a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
index c5b2a082..0e5f3ae4 100644
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
@@ -13,8 +13,8 @@ private class ObservableMetaWrapper(
     val listeners: MutableSet<MetaListener>
 ) : ObservableMutableMeta {
     override val items: Map<NameToken, ObservableMutableMeta>
-        get() = root.items.mapValues {
-            ObservableMetaWrapper(root, absoluteName + it.key, listeners)
+        get() = root.items.keys.associateWith {
+            ObservableMetaWrapper(root, absoluteName + it, listeners)
         }
 
     override fun getMeta(name: Name): ObservableMutableMeta? =
diff --git a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
index 31608af6..6c8ab3e9 100644
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
@@ -14,7 +14,15 @@ public class SealedMeta internal constructor(
 ) : TypedMeta<SealedMeta> {
     override fun toString(): String = Meta.toString(this)
     override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
-    override fun hashCode(): Int = Meta.hashCode(this)
+
+    /**
+     * Compute hash code once to optimize later access
+     */
+    private val cachedHashCode by lazy {
+        Meta.hashCode(this)
+    }
+
+    override fun hashCode(): Int = cachedHashCode
 }
 
 /**
diff --git a/dataforge-workspace/build.gradle.kts b/dataforge-workspace/build.gradle.kts
index 1ab9f957..7784bc35 100644
--- a/dataforge-workspace/build.gradle.kts
+++ b/dataforge-workspace/build.gradle.kts
@@ -1,9 +1,9 @@
 plugins {
     id("space.kscience.gradle.mpp")
-    id("space.kscience.gradle.native")
 }
 
 kscience{
+    native()
     useCoroutines()
 }
 
@@ -16,6 +16,11 @@ kotlin {
                 api(project(":dataforge-io"))
             }
         }
+        jvmTest{
+            dependencies{
+                implementation("ch.qos.logback:logback-classic:1.4.1")
+            }
+        }
     }
 }
 
diff --git a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt
index 75c411ce..cc83c988 100644
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt
@@ -22,6 +22,11 @@ import kotlin.reflect.typeOf
 @Type(TYPE)
 public interface Task<out T : Any> : Described {
 
+    /**
+     * A task identification string used to compare tasks and check task body for change
+     */
+    public val fingerprint: String get() = hashCode().toString()
+
     /**
      * Compute a [TaskResult] using given meta. In general, the result is lazy and represents both computation model
      * and a handler for actual result
diff --git a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/TaskData.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/TaskData.kt
index bd2bdb48..4a3bb620 100644
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/TaskData.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/TaskData.kt
@@ -17,7 +17,7 @@ public interface TaskData<out T : Any> : NamedData<T> {
     /**
      * The name of the stage that produced this data. [Name.EMPTY] if the workspace intrinsic data is used.
      */
-    public val task: Name
+    public val taskName: Name
 
     /**
      * Stage configuration used to produce this data.
@@ -34,7 +34,7 @@ private class TaskDataImpl<out T : Any>(
     override val workspace: Workspace,
     override val data: Data<T>,
     override val name: Name,
-    override val task: Name,
+    override val taskName: Name,
     override val taskMeta: Meta,
 ) : TaskData<T>, Data<T> by data {
 //    override val dependencies: Collection<TaskData<*>> = data.dependencies.map {
diff --git a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Workspace.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Workspace.kt
index 0053850d..b53f20f1 100644
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Workspace.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Workspace.kt
@@ -15,6 +15,9 @@ public interface DataSelector<T: Any>{
     public suspend fun select(workspace: Workspace, meta: Meta): DataSet<T>
 }
 
+/**
+ * An environment for pull-mode computation
+ */
 @Type(Workspace.TYPE)
 public interface Workspace : ContextAware, Provider {
     /**
@@ -28,7 +31,7 @@ public interface Workspace : ContextAware, Provider {
     public val targets: Map<String, Meta>
 
     /**
-     * All stages associated with the workspace
+     * All tasks associated with the workspace
      */
     public val tasks: Map<Name, Task<*>>
 
diff --git a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/SimpleWorkspace.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBase.kt
similarity index 60%
rename from dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/SimpleWorkspace.kt
rename to dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBase.kt
index e800d8b3..e9422703 100644
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/SimpleWorkspace.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBase.kt
@@ -10,16 +10,18 @@ import space.kscience.dataforge.names.Name
 /**
  * A simple workspace without caching
  */
-public class SimpleWorkspace(
+public class WorkspaceBase internal constructor(
     override val context: Context,
     data: DataSet<*>,
     override val targets: Map<String, Meta>,
     private val externalTasks: Map<Name, Task<*>>,
+    private val postProcess: suspend (TaskResult<*>) -> TaskResult<*>,
 ) : Workspace {
 
     override val data: TaskResult<*> = wrapResult(data, Name.EMPTY, Meta.EMPTY)
 
-    override val tasks: Map<Name, Task<*>>
-        get() = context.gather<Task<*>>(Task.TYPE) + externalTasks
+    override val tasks: Map<Name, Task<*>> by lazy { context.gather<Task<*>>(Task.TYPE) + externalTasks }
 
+    override suspend fun produce(taskName: Name, taskMeta: Meta): TaskResult<*> =
+        postProcess(super.produce(taskName, taskMeta))
 }
\ No newline at end of file
diff --git a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt
index 4a847e64..7784bfcc 100644
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt
@@ -88,6 +88,7 @@ public class WorkspaceBuilder(private val parentContext: Context = Global) : Tas
     private var data: DataSet<*>? = null
     private val targets: HashMap<String, Meta> = HashMap()
     private val tasks = HashMap<Name, Task<*>>()
+    private var cache: WorkspaceCache? = null
 
     /**
      * Define a context for the workspace
@@ -123,7 +124,16 @@ public class WorkspaceBuilder(private val parentContext: Context = Global) : Tas
         tasks[taskName] = task
     }
 
-    public fun build(): Workspace = SimpleWorkspace(context ?: parentContext, data ?: DataSet.EMPTY, targets, tasks)
+    public fun useCache() {
+        cache = InMemoryWorkspaceCache()
+    }
+
+    public fun build(): Workspace {
+        val postProcess: suspend (TaskResult<*>) -> TaskResult<*> = { result ->
+            cache?.evaluate(result) ?: result
+        }
+        return WorkspaceBase(context ?: parentContext, data ?: DataSet.EMPTY, targets, tasks, postProcess)
+    }
 }
 
 /**
diff --git a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceCache.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceCache.kt
new file mode 100644
index 00000000..0f37d4e9
--- /dev/null
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceCache.kt
@@ -0,0 +1,38 @@
+package space.kscience.dataforge.workspace
+
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.names.Name
+import kotlin.reflect.KType
+
+public interface WorkspaceCache {
+    public suspend fun <T : Any> evaluate(result: TaskResult<T>): TaskResult<T>
+}
+
+private typealias TaskResultId = Pair<Name, Meta>
+
+public class InMemoryWorkspaceCache : WorkspaceCache {
+
+    // never do that at home!
+    private val cache = HashMap<TaskResultId, HashMap<Name, TaskData<*>>>()
+
+    //TODO do actual check
+    private fun <T : Any> TaskData<*>.checkType(taskType: KType): TaskData<T> = this as TaskData<T>
+
+    override suspend fun <T : Any> evaluate(result: TaskResult<T>): TaskResult<T> {
+        for (d: TaskData<T> in result) {
+            cache.getOrPut(result.taskName to result.taskMeta) { HashMap() }.getOrPut(d.name) { d }
+        }
+
+        return object : TaskResult<T> by result {
+            override fun iterator(): Iterator<TaskData<T>> = (cache[result.taskName to result.taskMeta]
+                ?.values?.map { it.checkType<T>(result.dataType) }
+                ?: emptyList()).iterator()
+
+            override fun get(name: Name): TaskData<T>? {
+                val cached: TaskData<*> = cache[result.taskName to result.taskMeta]?.get(name) ?: return null
+                //TODO check types
+                return cached.checkType(result.dataType)
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/WorkspacePlugin.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspacePlugin.kt
similarity index 100%
rename from dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/WorkspacePlugin.kt
rename to dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspacePlugin.kt
diff --git a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
index 9fd31d1c..baf17ee1 100644
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
@@ -1,19 +1,38 @@
 package space.kscience.dataforge.workspace
 
+import space.kscience.dataforge.context.PluginFactory
 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.MutableMeta
 import space.kscience.dataforge.meta.toMutableMeta
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.plus
 
 /**
  * Select data using given [selector]
  */
 public suspend fun <T : Any> TaskResultBuilder<*>.from(
     selector: DataSelector<T>,
-): DataSet<T> = selector.select(workspace, taskMeta)
+    meta: Meta = taskMeta
+): DataSet<T> = selector.select(workspace, meta)
+
+
+/**
+ * Select data from a [WorkspacePlugin] attached to this [Workspace] context.
+ */
+public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
+    pluginFactory: PluginFactory<P>,
+    meta: Meta = taskMeta,
+    selectorBuilder: P.() -> TaskReference<T>,
+): DataSet<T> {
+    val plugin = workspace.context.plugins[pluginFactory]
+        ?: error("Plugin ${pluginFactory.tag} not loaded into workspace context")
+    val taskReference: TaskReference<T> = plugin.selectorBuilder()
+    return workspace.produce(plugin.name + taskReference.taskName, meta) as TaskResult<T>
+}
 
 public val TaskResultBuilder<*>.allData: DataSelector<*>
     get() = object : DataSelector<Any> {
@@ -27,11 +46,14 @@ public val TaskResultBuilder<*>.allData: DataSelector<*>
 @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
+    selectorMeta: Meta = taskMeta,
+    dataMetaTransform: MutableMeta.() -> Unit = {},
+    crossinline action: suspend (arg: T, name: Name, meta: Meta) -> R,
 ) {
-    from(selector).forEach { data ->
+    from(selector, selectorMeta).forEach { data ->
         val meta = data.meta.toMutableMeta().apply {
             taskName put taskMeta
+            dataMetaTransform()
         }
 
         val res = data.map(workspace.context.coroutineContext, meta) {
diff --git a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/workspaceJvm.kt b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/workspaceJvm.kt
index 02bf9001..2d368d09 100644
--- a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/workspaceJvm.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/workspaceJvm.kt
@@ -11,6 +11,9 @@ import space.kscience.dataforge.names.matches
 //    data(builder)
 //}
 
+/**
+ * Select the whole data set from the workspace filtered by type.
+ */
 @OptIn(DFExperimental::class)
 public inline fun <reified T : Any> TaskResultBuilder<*>.data(namePattern: Name? = null): DataSelector<T> =
     object : DataSelector<T> {
diff --git a/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/CachingWorkspaceTest.kt b/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/CachingWorkspaceTest.kt
new file mode 100644
index 00000000..9bf72aec
--- /dev/null
+++ b/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/CachingWorkspaceTest.kt
@@ -0,0 +1,46 @@
+package space.kscience.dataforge.workspace
+
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.Test
+import space.kscience.dataforge.data.startAll
+import space.kscience.dataforge.data.static
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.boolean
+import space.kscience.dataforge.meta.get
+
+class CachingWorkspaceTest {
+    val workspace = Workspace {
+        data {
+            //statically initialize data
+            repeat(5) {
+                static("myData[$it]", it)
+            }
+        }
+
+        useCache()
+
+        val doFirst by task<Any> {
+            pipeFrom(data()) { _, name, meta ->
+                println("Done first on $name with flag=${taskMeta["flag"].boolean ?: false}")
+            }
+        }
+
+        val doSecond by task<Any>{
+            pipeFrom(doFirst) { _, name, meta ->
+                println("Done second on $name with flag=${taskMeta["flag"].boolean ?: false}")
+            }
+        }
+    }
+
+
+    @Test
+    fun testMetaPropagation() = runTest {
+        val first = workspace.produce("doFirst")
+        val secondA = workspace.produce("doSecond")
+        val secondB = workspace.produce("doSecond", Meta { "flag" put true })
+        first.startAll(this)
+        secondA.startAll(this)
+        secondB.startAll(this)
+    }
+
+}
\ No newline at end of file
diff --git a/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt b/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt
index db231c80..5e06f45c 100644
--- a/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt
+++ b/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt
@@ -33,40 +33,44 @@ public fun Workspace.produceBlocking(task: String, block: MutableMeta.() -> Unit
     produce(task, block)
 }
 
+@OptIn(DFExperimental::class)
+internal object TestPlugin : WorkspacePlugin() {
+    override val tag: PluginTag = PluginTag("test")
 
-@DFExperimental
-class SimpleWorkspaceTest {
-    val testPlugin = object : WorkspacePlugin() {
-        override val tag: PluginTag = PluginTag("test")
-
-        val test by task<Any> {
-            populateFrom(
-                workspace.data.map {
-                    it.also {
-                        logger.info { "Test: $it" }
-                    }
-                }
-            )
+    val test by task {
+        // type is inferred
+        pipeFrom(data<Int>()) { arg, _, _ ->
+            logger.info { "Test: $arg" }
+            arg
         }
+
     }
 
+}
 
-    val testPluginFactory = testPlugin.toFactory()
+
+@DFExperimental
+internal class SimpleWorkspaceTest {
+
+    val testPluginFactory = TestPlugin.toFactory()
 
     val workspace = Workspace {
 
         context {
+            //load existing task via plugin into the workspace
             plugin(testPluginFactory)
         }
 
         data {
+            //statically initialize data
             repeat(100) {
                 static("myData[$it]", it)
             }
         }
 
         val filterOne by task<Int> {
-            workspace.data.getByType<Int>("myData[12]")?.let { source ->
+            val name by taskMeta.string { error("Name field not defined") }
+            from(testPluginFactory) { test }.getByType<Int>(name)?.let { source ->
                 data(source.name, source.map { it })
             }
         }
@@ -74,19 +78,11 @@ class SimpleWorkspaceTest {
         val square by task<Int> {
             pipeFrom(data<Int>()) { arg, name, meta ->
                 if (meta["testFlag"].boolean == true) {
-                    println("flag")
+                    println("Side effect")
                 }
                 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> {
@@ -94,17 +90,13 @@ class SimpleWorkspaceTest {
                 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> {
             val squareData = from(square)
             val linearData = from(linear)
             squareData.forEach { data ->
-                val newData: Data<Int> = data.combine(linearData.get(data.name)!!) { l, r ->
+                val newData: Data<Int> = data.combine(linearData[data.name]!!) { l, r ->
                     l + r
                 }
                 data(data.name, newData)
@@ -190,8 +182,10 @@ class SimpleWorkspaceTest {
     @Test
     fun testFilter() {
         runBlocking {
-            val node = workspace.produce("filterOne")
-            assertEquals(12, node.asSequence().first().await())
+            val node = workspace.produce("filterOne") {
+                "name" put "myData[12]"
+            }
+            assertEquals(12, node.single().await())
         }
     }
 }
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index 4ec08ab4..a289b498 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,4 +5,4 @@ kotlin.code.style=official
 kotlin.mpp.stability.nowarn=true
 kotlin.incremental.js.ir=true
 
-toolsVersion=0.12.0-kotlin-1.7.20-Beta
+toolsVersion=0.13.0-kotlin-1.7.20-Beta
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index aa991fce..ae04661e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists