Scheme made observable

.github/workflows/pages.yml

@@ -0,0 +1,33 @@
+name: Dokka publication
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout the repo
+        uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Cache gradle
+        uses: actions/cache@v2
+        with:
+          path: ~/.gradle/caches
+          key: ubuntu-20.04-gradle-${{ hashFiles('*.gradle.kts') }}
+          restore-keys: |
+            ubuntu-20.04-gradle-
+      - name: Build
+        run: |
+          ./gradlew dokkaHtmlMultiModule --no-daemon --no-parallel --stacktrace
+          mv build/dokka/htmlMultiModule/-modules.html build/dokka/htmlMultiModule/index.html
+      - name: Deploy to GitHub Pages
+        uses: JamesIves/github-pages-deploy-action@4.1.0
+        with:
+          branch: gh-pages
+          folder: build/dokka/htmlMultiModule

build.gradle.kts

@@ -4,15 +4,11 @@ plugins {
 
 allprojects {
     group = "space.kscience"
-    version = "0.4.0-dev-2"
+    version = "0.4.0-dev-5"
 }
 
 subprojects {
     apply(plugin = "maven-publish")
-    repositories {
-        maven("https://dl.bintray.com/mipt-npm/kscience")
-        maven("https://dl.bintray.com/mipt-npm/dev")
-    }
 }
 
 readme {

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

@@ -28,12 +28,11 @@ public interface DataSet<out T : Any> {
     public suspend fun getData(name: Name): Data<T>?
 
     /**
-     * Get a snapshot of names of children of given node. Empty if node does not exist or is a leaf.
-     *
-     * By default traverses the whole tree. Could be optimized in descendants
+     * Get a snapshot of names of top level children of given node. Empty if node does not exist or is a leaf.
      */
-    public suspend fun listChildren(prefix: Name = Name.EMPTY): List<Name> =
+    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
 
     public companion object {
         public val META_KEY: Name = "@meta".asName()

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

@@ -43,7 +43,7 @@ public interface DataTree<out T : Any> : DataSet<T> {
         }
     }
 
-    override suspend fun listChildren(prefix: Name): List<Name> =
+    override suspend fun listTop(prefix: Name): List<Name> =
         getItem(prefix).tree?.items()?.keys?.map { prefix + it } ?: emptyList()
 
     override suspend fun getData(name: Name): Data<T>? = when (name.length) {

dataforge-meta/api/dataforge-meta.api

@@ -433,12 +433,14 @@ public final class space/kscience/dataforge/meta/ReadOnlySpecification$DefaultIm
 	public static fun invoke (Lspace/kscience/dataforge/meta/ReadOnlySpecification;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/ItemProvider;
 }
 
-public class space/kscience/dataforge/meta/Scheme : space/kscience/dataforge/meta/MetaRepr, space/kscience/dataforge/meta/MutableItemProvider, space/kscience/dataforge/meta/descriptors/Described {
+public class space/kscience/dataforge/meta/Scheme : space/kscience/dataforge/meta/MetaRepr, space/kscience/dataforge/meta/MutableItemProvider, space/kscience/dataforge/meta/ObservableItemProvider, space/kscience/dataforge/meta/descriptors/Described {
 	public fun <init> ()V
 	public fun getDefaultLayer ()Lspace/kscience/dataforge/meta/Meta;
 	public synthetic fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/ItemDescriptor;
 	public final fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/NodeDescriptor;
 	public fun getItem (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMetaItem;
+	public fun onChange (Ljava/lang/Object;Lkotlin/jvm/functions/Function3;)V
+	public fun removeListener (Ljava/lang/Object;)V
 	public final fun setDescriptor (Lspace/kscience/dataforge/meta/descriptors/NodeDescriptor;)V
 	public fun setItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/TypedMetaItem;)V
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Laminate;

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

@@ -4,19 +4,42 @@ import space.kscience.dataforge.meta.descriptors.*
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.NameToken
 import space.kscience.dataforge.names.asName
+import kotlin.jvm.Synchronized
 
 /**
  * A base for delegate-based or descriptor-based scheme. [Scheme] has an empty constructor to simplify usage from [Specification].
  * Default item provider and [NodeDescriptor] are optional
  */
-public open class Scheme() : MutableItemProvider, Described, MetaRepr {
+public open class Scheme() : MutableItemProvider, Described, MetaRepr, ObservableItemProvider {
 
     private var items: MutableItemProvider = Config()
 
+    private val listeners = HashSet<ItemListener>()
+
     private var default: ItemProvider? = null
 
     final override var descriptor: NodeDescriptor? = null
 
+
+    /**
+     * Add a listener to this scheme changes. If the inner provider is observable, then listening will be delegated to it.
+     * Otherwise, local listeners will be created.
+     */
+    @Synchronized
+    override fun onChange(owner: Any?, action: (Name, MetaItem?, MetaItem?) -> Unit) {
+        (items as? ObservableItemProvider)?.onChange(owner, action)
+            ?: run { listeners.add(ItemListener(owner, action)) }
+    }
+
+    /**
+     * Remove all listeners belonging to given owner
+     */
+    @Synchronized
+    override fun removeListener(owner: Any?) {
+        (items as? ObservableItemProvider)?.removeListener(owner)
+            ?: listeners.removeAll { it.owner === owner }
+    }
+
     internal fun wrap(
         items: MutableItemProvider,
         default: ItemProvider? = null,
@@ -50,13 +73,16 @@ public open class Scheme() : MutableItemProvider, Described, MetaRepr {
      * Set a configurable property
      */
     override fun setItem(name: Name, item: MetaItem?) {
+        val oldItem = items[name]
         if (validateItem(name, item)) {
             items[name] = item
+            listeners.forEach { it.action(name, oldItem, item) }
         } else {
             error("Validation failed for property $name with value $item")
         }
     }
 
+
     /**
      * Provide a default layer which returns items from [default] and falls back to descriptor
      * values if default value is unavailable.

settings.gradle.kts

@@ -7,8 +7,8 @@ pluginManagement {
         maven("https://dl.bintray.com/kotlin/kotlin-eap")
     }
 
-    val toolsVersion = "0.9.1"
-    val kotlinVersion = "1.4.31"
+    val toolsVersion = "0.9.3"
+    val kotlinVersion = "1.4.32"
 
     plugins {
         id("ru.mipt.npm.gradle.project") version toolsVersion