IO refactoring

build.gradle.kts

@@ -3,7 +3,9 @@ plugins {
     id("org.jetbrains.changelog") version "0.4.0"
 }
 
-val dataforgeVersion by extra("0.1.9-dev-5")
+apply(plugin = "org.jetbrains.dokka")
+
+val dataforgeVersion by extra("0.2.0-dev-1")
 
 val bintrayRepo by extra("dataforge")
 val githubProject by extra("dataforge-core")

dataforge-context/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
     id("ru.mipt.npm.mpp")
     id("ru.mipt.npm.node")
-//    id("ru.mipt.npm.native")
+    id("ru.mipt.npm.native")
 }
 
 description = "Context and provider definitions"

dataforge-context/src/commonMain/kotlin/hep/dataforge/context/AbstractPlugin.kt

@@ -6,7 +6,7 @@ import kotlin.properties.ReadOnlyProperty
 import kotlin.reflect.KClass
 import kotlin.reflect.KProperty
 
-abstract class AbstractPlugin(override val meta: Meta = Meta.EMPTY) : Plugin {
+public abstract class AbstractPlugin(override val meta: Meta = Meta.EMPTY) : Plugin {
     private var _context: Context? = null
     private val dependencies = ArrayList<PluginFactory<*>>()
 
@@ -32,7 +32,7 @@ abstract class AbstractPlugin(override val meta: Meta = Meta.EMPTY) : Plugin {
     }
 }
 
-fun <T : Named> Collection<T>.toMap(): Map<Name, T> = associate { it.name to it }
+public fun <T : Named> Collection<T>.toMap(): Map<Name, T> = associate { it.name to it }
 
 private class PluginDependencyDelegate<P : Plugin>(val type: KClass<out P>) : ReadOnlyProperty<AbstractPlugin, P> {
     override fun getValue(thisRef: AbstractPlugin, property: KProperty<*>): P {

dataforge-context/src/commonMain/kotlin/hep/dataforge/context/Context.kt

@@ -2,13 +2,11 @@ package hep.dataforge.context
 
 import hep.dataforge.meta.*
 import hep.dataforge.names.Name
-import hep.dataforge.names.asName
 import hep.dataforge.names.plus
 import hep.dataforge.provider.Provider
 import hep.dataforge.provider.top
 import hep.dataforge.values.Value
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
 import mu.KLogger
@@ -28,9 +26,9 @@ import kotlin.jvm.JvmName
  * Since plugins could contain mutable state, context has two states: active and inactive. No changes are allowed to active context.
  * @author Alexander Nozik
  */
-open class Context(
+public open class Context(
     final override val name: Name,
-    val parent: Context? = Global
+    public val parent: Context? = Global,
 ) : Named, MetaRepr, Provider, CoroutineScope {
 
     private val config = Config()
@@ -38,7 +36,7 @@ open class Context(
     /**
      * Context properties. Working as substitute for environment variables
      */
-    val properties: Meta = if (parent == null) {
+    private val properties: Meta = if (parent == null) {
         config
     } else {
         Laminate(config, parent.properties)
@@ -47,19 +45,19 @@ open class Context(
     /**
      * Context logger
      */
-    val logger: KLogger = KotlinLogging.logger(name.toString())
+    public val logger: KLogger = KotlinLogging.logger(name.toString())
 
     /**
      * A [PluginManager] for current context
      */
-    val plugins: PluginManager by lazy { PluginManager(this) }
+    public val plugins: PluginManager by lazy { PluginManager(this) }
 
     private val activators = HashSet<Any>()
 
     /**
      * Defines if context is used in any kind of active computations. Active context properties and plugins could not be changed
      */
-    val isActive: Boolean = activators.isNotEmpty()
+    public val isActive: Boolean = activators.isNotEmpty()
 
     override val defaultTarget: String get() = Plugin.PLUGIN_TARGET
 
@@ -74,21 +72,21 @@ open class Context(
     /**
      * Mark context as active and used by [activator]
      */
-    fun activate(activator: Any) {
+    public fun activate(activator: Any) {
         activators.add(activator)
     }
 
     /**
      * Mark context unused by [activator]
      */
-    fun deactivate(activator: Any) {
+    public fun deactivate(activator: Any) {
         activators.remove(activator)
     }
 
     /**
      * Change the properties of the context. If active, throw an exception
      */
-    fun configure(action: Config.() -> Unit) {
+    public fun configure(action: Config.() -> Unit) {
         if (isActive) error("Can't configure active context")
         config.action()
     }
@@ -102,7 +100,7 @@ open class Context(
     /**
      * Detach all plugins and terminate context
      */
-    open fun close() {
+    public open fun close() {
         if (isActive) error("Can't close active context")
         //detach all plugins
         plugins.forEach { it.detach() }
@@ -115,71 +113,30 @@ open class Context(
     }
 }
 
-fun Context.content(target: String): Map<Name, Any> = content<Any>(target)
-
 /**
  * A map of all objects provided by plugins with given target and type
  */
 @JvmName("typedContent")
-inline fun <reified T : Any> Context.content(target: String): Map<Name, T> =
+public inline fun <reified T : Any> Context.resolve(target: String): Map<Name, T> = plugins.flatMap { plugin ->
-    plugins.flatMap { plugin ->
     plugin.top<T>(target).entries.map { (plugin.name + it.key) to it.value }
-    }.associate { it }
+}.associate { it }
 
 
-/**
+public fun Context.resolve(target: String): Map<Name, Any> = resolve<Any>(target)
- * A global root context. Closing [Global] terminates the framework.
- */
-object Global : Context("GLOBAL".asName(), null) {
-
-    override val coroutineContext: CoroutineContext = GlobalScope.coroutineContext + SupervisorJob()
-
-    /**
-     * Closing all contexts
-     *
-     * @throws Exception
-     */
-    override fun close() {
-        logger.info { "Shutting down GLOBAL" }
-        for (ctx in contextRegistry.values) {
-            ctx.close()
-        }
-        super.close()
-    }
-
-    private val contextRegistry = HashMap<String, Context>()
-
-    /**
-     * Get previously built context
-     *
-     * @param name
-     * @return
-     */
-    fun getContext(name: String): Context? {
-        return contextRegistry[name]
-    }
-
-    fun context(name: String, parent: Context = this, block: ContextBuilder.() -> Unit = {}): Context =
-        ContextBuilder(name, parent).apply(block).build()
-
-}
-
 
 /**
  * The interface for something that encapsulated in context
  *
- * @author Alexander Nozik
- * @version $Id: $Id
  */
-interface ContextAware {
+public interface ContextAware {
     /**
      * Get context for this object
      *
      * @return
      */
-    val context: Context
+    public val context: Context
 
-    val logger: KLogger
+    public val logger: KLogger
         get() = if (this is Named) {
             KotlinLogging.logger((context.name + this.name).toString())
         } else {

dataforge-context/src/commonMain/kotlin/hep/dataforge/context/ContextBuilder.kt

@@ -9,31 +9,34 @@ import hep.dataforge.names.toName
  * A convenience builder for context
  */
 @DFBuilder
-class ContextBuilder(var name: String = "@anonymous", val parent: Context = Global) {
+public class ContextBuilder(private val parent: Context = Global, public var name: String = "@anonymous") {
     private val plugins = ArrayList<Plugin>()
     private var meta = MetaBuilder()
 
-    fun properties(action: MetaBuilder.() -> Unit) {
+    public fun properties(action: MetaBuilder.() -> Unit) {
         meta.action()
     }
 
-    fun plugin(plugin: Plugin) {
+    public fun plugin(plugin: Plugin) {
         plugins.add(plugin)
     }
 
-    fun plugin(tag: PluginTag, action: MetaBuilder.() -> Unit = {}) {
+    public fun plugin(tag: PluginTag, action: MetaBuilder.() -> Unit = {}) {
-        plugins.add(PluginRepository.fetch(tag, Meta(action)))
+        val factory = parent.resolve<PluginFactory<*>>(PluginFactory.TYPE).values
+            .find { it.tag.matches(tag) } ?: error("Can't resolve plugin factory for $tag")
+        val plugin = factory.invoke(Meta(action), parent)
+        plugins.add(plugin)
     }
 
-    fun plugin(builder: PluginFactory<*>, action: MetaBuilder.() -> Unit = {}) {
+    public fun plugin(builder: PluginFactory<*>, action: MetaBuilder.() -> Unit = {}) {
         plugins.add(builder.invoke(Meta(action)))
     }
 
-    fun plugin(name: String, group: String = "", version: String = "", action: MetaBuilder.() -> Unit = {}) {
+    public fun plugin(name: String, group: String = "", version: String = "", action: MetaBuilder.() -> Unit = {}) {
         plugin(PluginTag(name, group, version), action)
     }
 
-    fun build(): Context {
+    public fun build(): Context {
         return Context(name.toName(), parent).apply {
             this@ContextBuilder.plugins.forEach {
                 plugins.load(it)

dataforge-context/src/commonMain/kotlin/hep/dataforge/context/Global.kt

@@ -0,0 +1,43 @@
+package hep.dataforge.context
+
+import hep.dataforge.names.asName
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.SupervisorJob
+import kotlin.coroutines.CoroutineContext
+
+/**
+ * A global root context. Closing [Global] terminates the framework.
+ */
+public object Global : Context("GLOBAL".asName(), null) {
+
+    override val coroutineContext: CoroutineContext = GlobalScope.coroutineContext + SupervisorJob()
+
+    /**
+     * Closing all contexts
+     *
+     * @throws Exception
+     */
+    override fun close() {
+        logger.info { "Shutting down GLOBAL" }
+        for (ctx in contextRegistry.values) {
+            ctx.close()
+        }
+        super.close()
+    }
+
+    private val contextRegistry = HashMap<String, Context>()
+
+    /**
+     * Get previously built context
+     *
+     * @param name
+     * @return
+     */
+    public fun getContext(name: String): Context? {
+        return contextRegistry[name]
+    }
+
+    public fun context(name: String, parent: Context = this, block: ContextBuilder.() -> Unit = {}): Context =
+        ContextBuilder(parent, name).apply(block).build()
+
+}

dataforge-context/src/commonMain/kotlin/hep/dataforge/context/PluginManager.kt

@@ -4,6 +4,17 @@ import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
 import kotlin.reflect.KClass
 
+
+interface PluginFactory<T : Plugin> : Factory<T> {
+    val tag: PluginTag
+    val type: KClass<out T>
+
+    companion object{
+        const val TYPE = "pluginFactory"
+    }
+}
+
+
 /**
  * The manager for plugin system. Should monitor plugin dependencies and locks.
  *

dataforge-context/src/commonMain/kotlin/hep/dataforge/context/PluginRepository.kt

@@ -1,48 +0,0 @@
-package hep.dataforge.context
-
-import hep.dataforge.meta.Meta
-import kotlin.reflect.KClass
-
-interface PluginFactory<T : Plugin> : Factory<T> {
-    val tag: PluginTag
-    val type: KClass<out T>
-}
-
-expect object PluginRepository {
-
-    fun register(factory: PluginFactory<*>)
-
-    /**
-     * List plugins available in the repository
-     */
-    fun list(): Sequence<PluginFactory<*>>
-
-}
-
-/**
- * Fetch specific plugin and instantiate it with given meta
- */
-fun PluginRepository.fetch(tag: PluginTag, meta: Meta = Meta.EMPTY): Plugin =
-    list().find { it.tag.matches(tag) }?.invoke(meta = meta)
-        ?: error("Plugin with tag $tag not found in the repository")
-
-fun <T : Plugin> PluginRepository.register(
-    tag: PluginTag,
-    type: KClass<out T>,
-    constructor: (Context, Meta) -> T
-): PluginFactory<T> {
-    val factory = object : PluginFactory<T> {
-        override val tag: PluginTag = tag
-        override val type: KClass<out T> = type
-
-        override fun invoke(meta: Meta, context: Context): T = constructor(context, meta)
-
-    }
-    register(factory)
-    return factory
-}
-
-inline fun <reified T : Plugin> PluginRepository.register(tag: PluginTag, noinline constructor: (Context, Meta) -> T) =
-    register(tag, T::class, constructor)
-
-fun PluginRepository.register(plugin: Plugin) = register(plugin.tag, plugin::class) { _, _ -> plugin }

dataforge-context/src/commonTest/kotlin/hep/dataforge/context/ContextTest.kt

@@ -22,7 +22,7 @@ class ContextTest {
     @Test
     fun testPluginManager() {
         Global.plugins.load(DummyPlugin())
-        val members = Global.content<Name>("test")
+        val members = Global.resolve<Name>("test")
         assertEquals(3, members.count())
         members.forEach {
             assertEquals(it.key, it.value.appendLeft("test"))

dataforge-context/src/jsMain/kotlin/hep/dataforge/context/PluginRepository.kt

@@ -1,16 +0,0 @@
-package hep.dataforge.context
-
-
-actual object PluginRepository {
-
-    private val factories: MutableSet<PluginFactory<*>> = HashSet()
-
-    actual fun register(factory: PluginFactory<*>) {
-        factories.add(factory)
-    }
-
-    /**
-     * List plugins available in the repository
-     */
-    actual fun list(): Sequence<PluginFactory<*>> = factories.asSequence()
-}

dataforge-context/src/jvmMain/kotlin/hep/dataforge/context/PluginRepository.kt

@@ -1,17 +0,0 @@
-package hep.dataforge.context
-
-actual object PluginRepository {
-
-    private val factories: MutableSet<PluginFactory<*>> = HashSet()
-
-    actual fun register(factory: PluginFactory<*>) {
-        factories.add(factory)
-    }
-
-    /**
-     * List plugins available in the repository
-     */
-    actual fun list(): Sequence<PluginFactory<*>> =
-        factories.asSequence() + Global.services()
-
-}

dataforge-context/src/jvmMain/kotlin/hep/dataforge/provider/Types.kt

@@ -1,7 +1,7 @@
 package hep.dataforge.provider
 
 import hep.dataforge.context.Context
-import hep.dataforge.context.content
+import hep.dataforge.context.resolve
 import hep.dataforge.names.Name
 import kotlin.reflect.KClass
 import kotlin.reflect.full.findAnnotation
@@ -40,5 +40,5 @@ inline fun <reified T : Any> Provider.top(): Map<Name, T> {
 /**
  * A sequences of all objects provided by plugins with given target and type
  */
-inline fun <reified T : Any> Context.content(): Map<Name, T> = content<T>(Types[T::class])
+inline fun <reified T : Any> Context.content(): Map<Name, T> = resolve<T>(Types[T::class])
 

dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt

@@ -13,14 +13,14 @@ import kotlinx.io.text.writeUtf8String
 @DFExperimental
 class FrontMatterEnvelopeFormat(
     val io: IOPlugin,
-    val meta: Meta = Meta.EMPTY
+    val meta: Meta = Meta.EMPTY,
 ) : EnvelopeFormat {
 
-    override fun Input.readPartial(): PartialEnvelope {
+    override fun readPartial(input: Input): PartialEnvelope {
         var line = ""
         var offset = 0u
         do {
-            line = readUtf8Line() //?: error("Input does not contain front matter separator")
+            line = input.readUtf8Line() //?: error("Input does not contain front matter separator")
             offset += line.toByteArray().size.toUInt()
         } while (!line.startsWith(SEPARATOR))
 
@@ -31,22 +31,21 @@ class FrontMatterEnvelopeFormat(
         //TODO replace by preview
         val meta = Binary {
             do {
-                line = readUtf8Line()
+                line = input.readUtf8Line()
                 writeUtf8String(line + "\r\n")
                 offset += line.toByteArray().size.toUInt()
             } while (!line.startsWith(SEPARATOR))
         }.read {
-            readMetaFormat.run {
+            readMetaFormat.readMeta(input)
-                readMeta()
+
-            }
         }
         return PartialEnvelope(meta, offset, null)
     }
 
-    override fun Input.readObject(): Envelope {
+    override fun readObject(input: Input): Envelope {
         var line = ""
         do {
-            line = readUtf8Line() //?: error("Input does not contain front matter separator")
+            line = input.readUtf8Line() //?: error("Input does not contain front matter separator")
         } while (!line.startsWith(SEPARATOR))
 
         val readMetaFormat =
@@ -55,14 +54,12 @@ class FrontMatterEnvelopeFormat(
 
         val meta = Binary {
             do {
-                writeUtf8String(readUtf8Line() + "\r\n")
+                writeUtf8String(input.readUtf8Line() + "\r\n")
             } while (!line.startsWith(SEPARATOR))
         }.read {
-            readMetaFormat.run {
+            readMetaFormat.readMeta(input)
-                readMeta()
         }
-        }
+        val bytes = input.readByteArray()
-        val bytes = readByteArray()
         val data = bytes.asBinary()
         return SimpleEnvelope(meta, data)
     }
@@ -70,7 +67,7 @@ class FrontMatterEnvelopeFormat(
     override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta) {
         val metaFormat = metaFormatFactory(formatMeta, io.context)
         writeRawString("$SEPARATOR\r\n")
-        metaFormat.run { writeObject(envelope.meta) }
+        metaFormat.run { writeObject(this@writeEnvelope, envelope.meta) }
         writeRawString("$SEPARATOR\r\n")
         //Printing data
         envelope.data?.let { data ->
@@ -105,14 +102,14 @@ class FrontMatterEnvelopeFormat(
 
         private val default by lazy { invoke() }
 
-        override fun Input.readPartial(): PartialEnvelope =
+        override fun readPartial(input: Input): PartialEnvelope =
-            default.run { readPartial() }
+            default.readPartial(input)
 
-        override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta) =
+        override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta): Unit =
             default.run { writeEnvelope(envelope, metaFormatFactory, formatMeta) }
 
-        override fun Input.readObject(): Envelope =
+        override fun readObject(input: Input): Envelope =
-            default.run { readObject() }
+            default.readObject(input)
 
     }
 }

dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/YamlMetaFormat.kt

@@ -16,17 +16,20 @@ import kotlinx.io.asInputStream
 import kotlinx.io.text.writeUtf8String
 import org.yaml.snakeyaml.Yaml
 
+/**
+ * Represent meta as Yaml
+ */
 @DFExperimental
-class YamlMetaFormat(val meta: Meta) : MetaFormat {
+public class YamlMetaFormat(private val meta: Meta) : MetaFormat {
     private val yaml = Yaml()
 
-    override fun Output.writeMeta(meta: Meta, descriptor: NodeDescriptor?) {
+    override fun writeMeta(output: Output, meta: Meta, descriptor: NodeDescriptor?) {
         val string = yaml.dump(meta.toMap(descriptor))
-        writeUtf8String(string)
+        output.writeUtf8String(string)
     }
 
-    override fun Input.readMeta(descriptor: NodeDescriptor?): Meta {
+    override fun readMeta(input: Input, descriptor: NodeDescriptor?): Meta {
-        val map: Map<String, Any?> = yaml.load(asInputStream())
+        val map: Map<String, Any?> = yaml.load(input.asInputStream())
         return map.toMeta(descriptor)
     }
 
@@ -35,19 +38,19 @@ class YamlMetaFormat(val meta: Meta) : MetaFormat {
         META_KEY put meta
     }
 
-    companion object : MetaFormatFactory {
+    public companion object : MetaFormatFactory {
         override fun invoke(meta: Meta, context: Context): MetaFormat = YamlMetaFormat(meta)
 
-        override val shortName = "yaml"
+        override val shortName: String = "yaml"
 
         override val key: Short = 0x594d //YM
 
         private val default = YamlMetaFormat()
 
-        override fun Output.writeMeta(meta: Meta, descriptor: NodeDescriptor?) =
+        override fun writeMeta(output: Output, meta: Meta, descriptor: NodeDescriptor?): Unit =
-            default.run { writeMeta(meta, descriptor) }
+            default.writeMeta(output, meta, descriptor)
 
-        override fun Input.readMeta(descriptor: NodeDescriptor?): Meta =
+        override fun readMeta(input: kotlinx.io.Input, descriptor: NodeDescriptor?): Meta =
-            default.run { readMeta(descriptor) }
+            default.readMeta(input, descriptor)
     }
 }

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/BinaryMetaFormat.kt

@@ -11,14 +11,18 @@ import kotlinx.io.*
 import kotlinx.io.text.readUtf8String
 import kotlinx.io.text.writeUtf8String
 
-object BinaryMetaFormat : MetaFormat, MetaFormatFactory {
+/**
+ * A DataForge-specific simplified binary format for meta
+ * TODO add description
+ */
+public object BinaryMetaFormat : MetaFormat, MetaFormatFactory {
     override val shortName: String = "bin"
     override val key: Short = 0x4249//BI
 
     override fun invoke(meta: Meta, context: Context): MetaFormat = this
 
-    override fun Input.readMeta(descriptor: NodeDescriptor?): Meta {
+    override fun readMeta(input: Input, descriptor: NodeDescriptor?): Meta {
-        return (readMetaItem() as MetaItem.NodeItem).node
+        return (input.readMetaItem() as MetaItem.NodeItem).node
     }
 
     private fun Output.writeChar(char: Char) = writeByte(char.toByte())
@@ -28,7 +32,7 @@ object BinaryMetaFormat : MetaFormat, MetaFormatFactory {
         writeUtf8String(str)
     }
 
-    fun Output.writeValue(value: Value) {
+    public fun Output.writeValue(value: Value) {
         if (value.isList()) {
             writeChar('L')
             writeInt(value.list.size)
@@ -75,17 +79,21 @@ object BinaryMetaFormat : MetaFormat, MetaFormatFactory {
         }
     }
 
-    override fun Output.writeMeta(meta: Meta, descriptor: NodeDescriptor?) {
+    override fun writeMeta(
-        writeChar('M')
+        output: kotlinx.io.Output,
-        writeInt(meta.items.size)
+        meta: hep.dataforge.meta.Meta,
+        descriptor: hep.dataforge.meta.descriptors.NodeDescriptor?
+    ) {
+        output.writeChar('M')
+        output.writeInt(meta.items.size)
         meta.items.forEach { (key, item) ->
-            writeString(key.toString())
+            output.writeString(key.toString())
             when (item) {
                 is MetaItem.ValueItem -> {
-                    writeValue(item.value)
+                    output.writeValue(item.value)
                 }
                 is MetaItem.NodeItem -> {
-                    writeObject(item.node)
+                    writeObject(output, item.node)
                 }
             }
         }
@@ -97,7 +105,7 @@ object BinaryMetaFormat : MetaFormat, MetaFormatFactory {
     }
 
     @Suppress("UNCHECKED_CAST")
-    fun Input.readMetaItem(): MetaItem<MetaBuilder> {
+    public fun Input.readMetaItem(): MetaItem<MetaBuilder> {
         return when (val keyChar = readByte().toChar()) {
             'S' -> MetaItem.ValueItem(StringValue(readString()))
             'N' -> MetaItem.ValueItem(Null)

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/Envelope.kt

@@ -4,64 +4,66 @@ import hep.dataforge.meta.Laminate
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.get
 import hep.dataforge.meta.string
+import hep.dataforge.names.Name
 import hep.dataforge.names.asName
 import hep.dataforge.names.plus
 import kotlinx.io.Binary
 
-interface Envelope {
+public interface Envelope {
-    val meta: Meta
+    public val meta: Meta
-    val data: Binary?
+    public val data: Binary?
 
-    companion object {
+    public companion object {
 
         /**
          * meta keys
          */
-        val ENVELOPE_NODE_KEY = "@envelope".asName()
+        public val ENVELOPE_NODE_KEY: Name = "@envelope".asName()
-        val ENVELOPE_TYPE_KEY = ENVELOPE_NODE_KEY + "type"
+        public val ENVELOPE_TYPE_KEY: Name = ENVELOPE_NODE_KEY + "type"
-        val ENVELOPE_DATA_TYPE_KEY = ENVELOPE_NODE_KEY + "dataType"
+        public val ENVELOPE_DATA_TYPE_KEY: Name = ENVELOPE_NODE_KEY + "dataType"
-        val ENVELOPE_DATA_ID_KEY = ENVELOPE_NODE_KEY + "dataID"
+        public val ENVELOPE_DATA_ID_KEY: Name = ENVELOPE_NODE_KEY + "dataID"
-        val ENVELOPE_DESCRIPTION_KEY = ENVELOPE_NODE_KEY + "description"
+        public val ENVELOPE_DESCRIPTION_KEY: Name = ENVELOPE_NODE_KEY + "description"
-        val ENVELOPE_NAME_KEY = ENVELOPE_NODE_KEY + "name"
+        public val ENVELOPE_NAME_KEY: Name = ENVELOPE_NODE_KEY + "name"
         //const val ENVELOPE_TIME_KEY = "@envelope.time"
 
         /**
          * Build a static envelope using provided builder
          */
-        inline operator fun invoke(block: EnvelopeBuilder.() -> Unit) = EnvelopeBuilder().apply(block).seal()
+        public inline operator fun invoke(block: EnvelopeBuilder.() -> Unit): Envelope =
+            EnvelopeBuilder().apply(block).seal()
     }
 }
 
-class SimpleEnvelope(override val meta: Meta, override val data: Binary?) : Envelope
+public class SimpleEnvelope(override val meta: Meta, override val data: Binary?) : Envelope
 
 /**
  * The purpose of the envelope
  *
  */
-val Envelope.type: String? get() = meta[Envelope.ENVELOPE_TYPE_KEY].string
+public val Envelope.type: String? get() = meta[Envelope.ENVELOPE_TYPE_KEY].string
 
 /**
  * The type of data encoding
  *
  */
-val Envelope.dataType: String? get() = meta[Envelope.ENVELOPE_DATA_TYPE_KEY].string
+public val Envelope.dataType: String? get() = meta[Envelope.ENVELOPE_DATA_TYPE_KEY].string
 
 /**
  * Textual user friendly description
  *
  */
-val Envelope.description: String? get() = meta[Envelope.ENVELOPE_DESCRIPTION_KEY].string
+public val Envelope.description: String? get() = meta[Envelope.ENVELOPE_DESCRIPTION_KEY].string
 
 /**
  * An optional unique identifier that is used for data comparison. Data without identifier could not be compared to another data.
  */
-val Envelope.dataID: String? get() = meta[Envelope.ENVELOPE_DATA_ID_KEY].string
+public val Envelope.dataID: String? get() = meta[Envelope.ENVELOPE_DATA_ID_KEY].string
 
-fun Envelope.metaEquals(other: Envelope): Boolean = this.meta == other.meta
+public fun Envelope.metaEquals(other: Envelope): Boolean = this.meta == other.meta
 
-fun Envelope.dataEquals(other: Envelope): Boolean = this.dataID != null && this.dataID == other.dataID
+public fun Envelope.dataEquals(other: Envelope): Boolean = this.dataID != null && this.dataID == other.dataID
 
-fun Envelope.contentEquals(other: Envelope): Boolean {
+public fun Envelope.contentEquals(other: Envelope): Boolean {
     return (this === other || (metaEquals(other) && dataEquals(other)))
 }
 
@@ -69,7 +71,7 @@ fun Envelope.contentEquals(other: Envelope): Boolean {
 /**
  * An envelope, which wraps existing envelope and adds one or several additional layers of meta
  */
-class ProxyEnvelope(val source: Envelope, vararg meta: Meta) : Envelope {
+public class ProxyEnvelope(public val source: Envelope, vararg meta: Meta) : Envelope {
     override val meta: Laminate = Laminate(*meta, source.meta)
     override val data: Binary? get() = source.data
 }
@@ -77,7 +79,7 @@ class ProxyEnvelope(val source: Envelope, vararg meta: Meta) : Envelope {
 /**
  * Add few meta layers to existing envelope (on top of existing meta)
  */
-fun Envelope.withMetaLayers(vararg layers: Meta): Envelope {
+public fun Envelope.withMetaLayers(vararg layers: Meta): Envelope {
     return when {
         layers.isEmpty() -> this
         this is ProxyEnvelope -> ProxyEnvelope(source, *layers, *this.meta.layers.toTypedArray())

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/EnvelopeFormat.kt

@@ -13,31 +13,28 @@ import kotlin.reflect.KClass
 /**
  * A partially read envelope with meta, but without data
  */
-@ExperimentalUnsignedTypes
+public data class PartialEnvelope(val meta: Meta, val dataOffset: UInt, val dataSize: ULong?)
-data class PartialEnvelope(val meta: Meta, val dataOffset: UInt, val dataSize: ULong?)
 
-interface EnvelopeFormat : IOFormat<Envelope> {
+public interface EnvelopeFormat : IOFormat<Envelope> {
-    val defaultMetaFormat: MetaFormatFactory get() = JsonMetaFormat
+    public val defaultMetaFormat: MetaFormatFactory get() = JsonMetaFormat
 
-    fun Input.readPartial(): PartialEnvelope
+    public fun readPartial(input: Input): PartialEnvelope
 
-    fun Output.writeEnvelope(
+    public fun Output.writeEnvelope(
         envelope: Envelope,
         metaFormatFactory: MetaFormatFactory = defaultMetaFormat,
         formatMeta: Meta = Meta.EMPTY
     )
 
-    override fun Input.readObject(): Envelope
+    override fun readObject(input: Input): Envelope
 
-    override fun Output.writeObject(obj: Envelope): Unit = writeEnvelope(obj)
+    override fun writeObject(output: Output, obj: Envelope): Unit = output.writeEnvelope(obj)
 }
 
-fun EnvelopeFormat.readPartial(input: Input) = input.readPartial()
+public fun EnvelopeFormat.read(input: Input): Envelope = readObject(input)
-
-fun EnvelopeFormat.read(input: Input) = input.readObject()
 
 @Type(ENVELOPE_FORMAT_TYPE)
-interface EnvelopeFormatFactory : IOFormatFactory<Envelope>, EnvelopeFormat {
+public interface EnvelopeFormatFactory : IOFormatFactory<Envelope>, EnvelopeFormat {
     override val name: Name get() = "envelope".asName()
     override val type: KClass<out Envelope> get() = Envelope::class
 
@@ -47,9 +44,9 @@ interface EnvelopeFormatFactory : IOFormatFactory<Envelope>, EnvelopeFormat {
      * Try to infer specific format from input and return null if the attempt is failed.
      * This method does **not** return Input into initial state.
      */
-    fun peekFormat(io: IOPlugin, input: Input): EnvelopeFormat?
+    public fun peekFormat(io: IOPlugin, input: Input): EnvelopeFormat?
 
-    companion object {
+    public companion object {
-        const val ENVELOPE_FORMAT_TYPE = "io.format.envelope"
+        public const val ENVELOPE_FORMAT_TYPE: String = "io.format.envelope"
     }
 }

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/EnvelopeParts.kt

@@ -31,11 +31,11 @@ private class PartDescriptor : Scheme() {
     }
 }
 
-data class EnvelopePart(val binary: Binary, val description: Meta?)
+public data class EnvelopePart(val binary: Binary, val description: Meta?)
 
-typealias EnvelopeParts = List<EnvelopePart>
+public typealias EnvelopeParts = List<EnvelopePart>
 
-fun EnvelopeBuilder.multipart(
+public fun EnvelopeBuilder.multipart(
     parts: EnvelopeParts,
     separator: String = DEFAULT_MULTIPART_DATA_SEPARATOR
 ) {
@@ -69,7 +69,7 @@ fun EnvelopeBuilder.multipart(
     }
 }
 
-fun EnvelopeBuilder.envelopes(
+public fun EnvelopeBuilder.envelopes(
     envelopes: List<Envelope>,
     format: EnvelopeFormat = TaggedEnvelopeFormat,
     separator: String = DEFAULT_MULTIPART_DATA_SEPARATOR
@@ -84,7 +84,7 @@ fun EnvelopeBuilder.envelopes(
     multipart(parts, separator)
 }
 
-fun Envelope.parts(): EnvelopeParts {
+public fun Envelope.parts(): EnvelopeParts {
     if (data == null) return emptyList()
     //TODO add zip folder reader
     val parts = meta.getIndexed(PARTS_KEY).values.mapNotNull { it.node }.map {
@@ -101,14 +101,14 @@ fun Envelope.parts(): EnvelopeParts {
     }
 }
 
-fun EnvelopePart.envelope(format: EnvelopeFormat): Envelope = binary.readWith(format)
+public fun EnvelopePart.envelope(format: EnvelopeFormat): Envelope = binary.readWith(format)
 
-val EnvelopePart.name: String? get() = description?.get("name").string
+public val EnvelopePart.name: String? get() = description?.get("name").string
 
 /**
  * Represent envelope part by an envelope
  */
-fun EnvelopePart.envelope(plugin: IOPlugin): Envelope {
+public fun EnvelopePart.envelope(plugin: IOPlugin): Envelope {
     val formatItem = description?.get(PART_FORMAT_KEY)
     return if (formatItem != null) {
         val format: EnvelopeFormat = plugin.resolveEnvelopeFormat(formatItem)

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt

@@ -20,41 +20,42 @@ import kotlin.reflect.KClass
 /**
  * And interface for reading and writing objects into with IO streams
  */
-interface IOFormat<T : Any> : MetaRepr {
+public interface IOFormat<T : Any> : MetaRepr {
-    fun Output.writeObject(obj: T)
+    public fun writeObject(output: Output, obj: T)
-    fun Input.readObject(): T
+    public fun readObject(input: Input): T
 
-    companion object{
+    public companion object {
-        val NAME_KEY = "name".asName()
+        public val NAME_KEY: Name = "name".asName()
-        val META_KEY = "meta".asName()
+        public val META_KEY: Name = "meta".asName()
     }
 }
 
-fun <T : Any> Input.readWith(format: IOFormat<T>): T = format.run { readObject() }
+public fun <T : Any> Input.readWith(format: IOFormat<T>): T = format.run { readObject(this@readWith) }
 
 /**
  * Read given binary as object using given format
  */
-fun <T : Any> Binary.readWith(format: IOFormat<T>): T = read {
+public fun <T : Any> Binary.readWith(format: IOFormat<T>): T = read {
     readWith(format)
 }
 
-fun <T : Any> Output.writeWith(format: IOFormat<T>, obj: T) = format.run { writeObject(obj) }
+public fun <T : Any> Output.writeWith(format: IOFormat<T>, obj: T): Unit =
+    format.run { writeObject(this@writeWith, obj) }
 
-class ListIOFormat<T : Any>(val format: IOFormat<T>) : IOFormat<List<T>> {
+public class ListIOFormat<T : Any>(public val format: IOFormat<T>) : IOFormat<List<T>> {
-    override fun Output.writeObject(obj: List<T>) {
+    override fun writeObject(output: Output, obj: List<T>) {
-        writeInt(obj.size)
+        output.writeInt(obj.size)
-        format.run {
+        this.format.run {
             obj.forEach {
-                writeObject(it)
+                writeObject(output, it)
             }
         }
     }
 
-    override fun Input.readObject(): List<T> {
+    override fun readObject(input: Input): List<T> {
-        val size = readInt()
+        val size = input.readInt()
         return format.run {
-            List(size) { readObject() }
+            List(size) { readObject(input) }
         }
     }
 
@@ -64,9 +65,9 @@ class ListIOFormat<T : Any>(val format: IOFormat<T>) : IOFormat<List<T>> {
     }
 }
 
-val <T : Any> IOFormat<T>.list get() = ListIOFormat(this)
+//public val <T : Any> IOFormat<T>.list: ListIOFormat<T> get() = ListIOFormat(this)
 
-fun ObjectPool<Buffer>.fill(block: Buffer.() -> Unit): Buffer {
+public fun ObjectPool<Buffer>.fill(block: Buffer.() -> Unit): Buffer {
     val buffer = borrow()
     return try {
         buffer.apply(block)
@@ -77,50 +78,50 @@ fun ObjectPool<Buffer>.fill(block: Buffer.() -> Unit): Buffer {
 }
 
 @Type(IO_FORMAT_TYPE)
-interface IOFormatFactory<T : Any> : Factory<IOFormat<T>>, Named, MetaRepr {
+public interface IOFormatFactory<T : Any> : Factory<IOFormat<T>>, Named, MetaRepr {
     /**
      * Explicit type for dynamic type checks
      */
-    val type: KClass<out T>
+    public val type: KClass<out T>
 
     override fun toMeta(): Meta = Meta {
         NAME_KEY put name.toString()
     }
 
-    companion object {
+    public companion object {
-        const val IO_FORMAT_TYPE = "io.format"
+        public const val IO_FORMAT_TYPE: String = "io.format"
     }
 }
 
-fun <T : Any> IOFormat<T>.toBinary(obj: T): Binary = Binary { writeObject(obj) }
+public fun <T : Any> IOFormat<T>.toBinary(obj: T): Binary = Binary { writeObject(this, obj) }
 
-object DoubleIOFormat : IOFormat<Double>, IOFormatFactory<Double> {
+public object DoubleIOFormat : IOFormat<Double>, IOFormatFactory<Double> {
     override fun invoke(meta: Meta, context: Context): IOFormat<Double> = this
 
     override val name: Name = "double".asName()
 
     override val type: KClass<out Double> get() = Double::class
 
-    override fun Output.writeObject(obj: Double) {
+    override fun writeObject(output: Output, obj: kotlin.Double) {
-        writeDouble(obj)
+        output.writeDouble(obj)
     }
 
-    override fun Input.readObject(): Double = readDouble()
+    override fun readObject(input: Input): Double = input.readDouble()
 }
 
-object ValueIOFormat : IOFormat<Value>, IOFormatFactory<Value> {
+public object ValueIOFormat : IOFormat<Value>, IOFormatFactory<Value> {
     override fun invoke(meta: Meta, context: Context): IOFormat<Value> = this
 
     override val name: Name = "value".asName()
 
     override val type: KClass<out Value> get() = Value::class
 
-    override fun Output.writeObject(obj: Value) {
+    override fun writeObject(output: Output, obj: Value) {
-        BinaryMetaFormat.run { writeValue(obj) }
+        BinaryMetaFormat.run { output.writeValue(obj) }
     }
 
-    override fun Input.readObject(): Value {
+    override fun readObject(input: Input): Value {
-        return (BinaryMetaFormat.run { readMetaItem() } as? MetaItem.ValueItem)?.value
+        return (BinaryMetaFormat.run { input.readMetaItem() } as? MetaItem.ValueItem)?.value
             ?: error("The item is not a value")
     }
 }

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOPlugin.kt

@@ -11,14 +11,14 @@ import hep.dataforge.names.Name
 import hep.dataforge.names.toName
 import kotlin.reflect.KClass
 
-class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
+public class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
     override val tag: PluginTag get() = Companion.tag
 
-    val ioFormatFactories by lazy {
+    public val ioFormatFactories: Collection<IOFormatFactory<*>> by lazy {
-        context.content<IOFormatFactory<*>>(IO_FORMAT_TYPE).values
+        context.resolve<IOFormatFactory<*>>(IO_FORMAT_TYPE).values
     }
 
-    fun <T : Any> resolveIOFormat(item: MetaItem<*>, type: KClass<out T>): IOFormat<T>? {
+    public fun <T : Any> resolveIOFormat(item: MetaItem<*>, type: KClass<out T>): IOFormat<T>? {
         val key = item.string ?: item.node[NAME_KEY]?.string ?: error("Format name not defined")
         val name = key.toName()
         return ioFormatFactories.find { it.name == name }?.let {
@@ -29,24 +29,24 @@ class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
     }
 
 
-    val metaFormatFactories by lazy {
+    public val metaFormatFactories: Collection<MetaFormatFactory> by lazy {
-        context.content<MetaFormatFactory>(META_FORMAT_TYPE).values
+        context.resolve<MetaFormatFactory>(META_FORMAT_TYPE).values
     }
 
-    fun resolveMetaFormat(key: Short, meta: Meta = Meta.EMPTY): MetaFormat? =
+    public fun resolveMetaFormat(key: Short, meta: Meta = Meta.EMPTY): MetaFormat? =
         metaFormatFactories.find { it.key == key }?.invoke(meta)
 
-    fun resolveMetaFormat(name: String, meta: Meta = Meta.EMPTY): MetaFormat? =
+    public fun resolveMetaFormat(name: String, meta: Meta = Meta.EMPTY): MetaFormat? =
         metaFormatFactories.find { it.shortName == name }?.invoke(meta)
 
-    val envelopeFormatFactories by lazy {
+    public val envelopeFormatFactories: Collection<EnvelopeFormatFactory> by lazy {
-        context.content<EnvelopeFormatFactory>(ENVELOPE_FORMAT_TYPE).values
+        context.resolve<EnvelopeFormatFactory>(ENVELOPE_FORMAT_TYPE).values
     }
 
-    fun resolveEnvelopeFormat(name: Name, meta: Meta = Meta.EMPTY): EnvelopeFormat? =
+    private fun resolveEnvelopeFormat(name: Name, meta: Meta = Meta.EMPTY): EnvelopeFormat? =
         envelopeFormatFactories.find { it.name == name }?.invoke(meta, context)
 
-    fun resolveEnvelopeFormat(item: MetaItem<*>): EnvelopeFormat? {
+    public fun resolveEnvelopeFormat(item: MetaItem<*>): EnvelopeFormat? {
         val name = item.string ?: item.node[NAME_KEY]?.string ?: error("Envelope format name not defined")
         val meta = item.node[META_KEY].node ?: Meta.EMPTY
         return resolveEnvelopeFormat(name.toName(), meta)
@@ -60,9 +60,9 @@ class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
         }
     }
 
-    companion object : PluginFactory<IOPlugin> {
+    public companion object : PluginFactory<IOPlugin> {
-        val defaultMetaFormats: List<MetaFormatFactory> = listOf(JsonMetaFormat, BinaryMetaFormat)
+        public val defaultMetaFormats: List<MetaFormatFactory> = listOf(JsonMetaFormat, BinaryMetaFormat)
-        val defaultEnvelopeFormats = listOf(TaggedEnvelopeFormat, TaglessEnvelopeFormat)
+        public val defaultEnvelopeFormats: List<EnvelopeFormatFactory> = listOf(TaggedEnvelopeFormat, TaglessEnvelopeFormat)
 
         override val tag: PluginTag = PluginTag("io", group = PluginTag.DATAFORGE_GROUP)
 
@@ -71,4 +71,4 @@ class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
     }
 }
 
-val Context.io: IOPlugin get() = plugins.fetch(IOPlugin)
+public val Context.io: IOPlugin get() = plugins.fetch(IOPlugin)

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/JsonMetaFormat.kt

@@ -17,39 +17,41 @@ import kotlinx.io.text.writeUtf8String
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonObject
 
+/**
+ * A Json format for Meta representation
+ */
+public class JsonMetaFormat(private val json: Json = DEFAULT_JSON) : MetaFormat {
 
-class JsonMetaFormat(private val json: Json = DEFAULT_JSON) : MetaFormat {
+    override fun writeMeta(output: Output, meta: Meta, descriptor: NodeDescriptor?) {
-
-    override fun Output.writeMeta(meta: Meta, descriptor: NodeDescriptor?) {
         val jsonObject = meta.toJson(descriptor)
-        writeUtf8String(json.encodeToString(JsonObject.serializer(), jsonObject))
+        output.writeUtf8String(this.json.encodeToString(JsonObject.serializer(), jsonObject))
     }
 
     override fun toMeta(): Meta = Meta {
         NAME_KEY put name.toString()
     }
 
-    override fun Input.readMeta(descriptor: NodeDescriptor?): Meta {
+    override fun readMeta(input: Input, descriptor: NodeDescriptor?): Meta {
-        val str = readByteArray().decodeToString()
+        val str = input.readByteArray().decodeToString()
         val jsonElement = json.parseToJsonElement(str)
         val item = jsonElement.toMetaItem(descriptor)
         return item.node ?: Meta.EMPTY
     }
 
-    companion object : MetaFormatFactory {
+    public companion object : MetaFormatFactory {
-        val DEFAULT_JSON = Json { prettyPrint = true }
+        public val DEFAULT_JSON: Json = Json { prettyPrint = true }
 
         override fun invoke(meta: Meta, context: Context): MetaFormat = default
 
-        override val shortName = "json"
+        override val shortName: String = "json"
         override val key: Short = 0x4a53//"JS"
 
         private val default = JsonMetaFormat()
 
-        override fun Output.writeMeta(meta: Meta, descriptor: NodeDescriptor?) =
+        override fun writeMeta(output: Output, meta: Meta, descriptor: NodeDescriptor?): Unit =
-            default.run { writeMeta(meta, descriptor) }
+            default.run { writeMeta(output, meta, descriptor) }
 
-        override fun Input.readMeta(descriptor: NodeDescriptor?): Meta =
+        override fun readMeta(input: Input, descriptor: NodeDescriptor?): Meta =
-            default.run { readMeta(descriptor) }
+            default.run { readMeta(input, descriptor) }
     }
 }

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/MetaFormat.kt

@@ -17,46 +17,50 @@ import kotlin.reflect.KClass
 /**
  * A format for meta serialization
  */
+public interface MetaFormat : IOFormat<Meta> {
 
-interface MetaFormat : IOFormat<Meta> {
+    override fun writeObject(output: Output, obj: Meta) {
-
+        writeMeta(output, obj, null)
-    override fun Output.writeObject(obj: Meta) {
-        writeMeta(obj, null)
     }
 
-    override fun Input.readObject(): Meta = readMeta()
+    override fun readObject(input: Input): Meta = readMeta(input)
 
-    fun Output.writeMeta(meta: Meta, descriptor: NodeDescriptor? = null)
+    public fun writeMeta(
-    fun Input.readMeta(descriptor: NodeDescriptor? = null): Meta
+        output: Output,
+        meta: Meta,
+        descriptor: NodeDescriptor? = null,
+    )
+
+    public fun readMeta(input: Input, descriptor: NodeDescriptor? = null): Meta
 }
 
 @Type(META_FORMAT_TYPE)
-interface MetaFormatFactory : IOFormatFactory<Meta>, MetaFormat {
+public interface MetaFormatFactory : IOFormatFactory<Meta>, MetaFormat {
-    val shortName: String
+    public val shortName: String
 
     override val name: Name get() = "meta".asName() + shortName
 
     override val type: KClass<out Meta> get() = Meta::class
 
-    val key: Short get() = name.hashCode().toShort()
+    public val key: Short get() = name.hashCode().toShort()
 
     override operator fun invoke(meta: Meta, context: Context): MetaFormat
 
-    companion object {
+    public companion object {
-        const val META_FORMAT_TYPE = "io.format.meta"
+        public const val META_FORMAT_TYPE: String = "io.format.meta"
     }
 }
 
-fun Meta.toString(format: MetaFormat): String = buildByteArray {
+public fun Meta.toString(format: MetaFormat): String = buildByteArray {
-    format.run { writeObject(this@toString) }
+    format.run { writeObject(this@buildByteArray, this@toString) }
 }.decodeToString()
 
-fun Meta.toString(formatFactory: MetaFormatFactory): String = toString(formatFactory())
+public fun Meta.toString(formatFactory: MetaFormatFactory): String = toString(formatFactory())
 
-fun MetaFormat.parse(str: String): Meta {
+public fun MetaFormat.parse(str: String): Meta {
-    return ByteArrayInput(str.encodeToByteArray()).use { it.readObject() }
+    return ByteArrayInput(str.encodeToByteArray()).use { readObject(it) }
 }
 
-fun MetaFormatFactory.parse(str: String, formatMeta: Meta): Meta = invoke(formatMeta).parse(str)
+public fun MetaFormatFactory.parse(str: String, formatMeta: Meta): Meta = invoke(formatMeta).parse(str)
 
 

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt

@@ -12,9 +12,13 @@ import hep.dataforge.names.plus
 import hep.dataforge.names.toName
 import kotlinx.io.*
 
-class TaggedEnvelopeFormat(
+/**
-    val io: IOPlugin,
+ * A streaming-friendly envelope format with a short binary tag.
-    val version: VERSION = VERSION.DF02
+ * TODO add description
+ */
+public class TaggedEnvelopeFormat(
+    public val io: IOPlugin,
+    public val version: VERSION = VERSION.DF02
 ) : EnvelopeFormat {
 
 //    private val metaFormat = io.metaFormat(metaFormatKey)
@@ -57,32 +61,32 @@ class TaggedEnvelopeFormat(
      * @param input an input to read from
      * @param formats a collection of meta formats to resolve
      */
-    override fun Input.readObject(): Envelope {
+    override fun readObject(input: Input): Envelope {
-        val tag = readTag(version)
+        val tag = input.readTag(this.version)
 
         val metaFormat = io.resolveMetaFormat(tag.metaFormatKey)
             ?: error("Meta format with key ${tag.metaFormatKey} not found")
 
-        val meta: Meta = limit(tag.metaSize.toInt()).run {
+        val meta: Meta = input.limit(tag.metaSize.toInt()).run {
             metaFormat.run {
-                readObject()
+                readObject(input)
             }
         }
 
-        val data = readBinary(tag.dataSize.toInt())
+        val data = input.readBinary(tag.dataSize.toInt())
 
         return SimpleEnvelope(meta, data)
     }
 
-    override fun Input.readPartial(): PartialEnvelope {
+    override fun readPartial(input: Input): PartialEnvelope {
-        val tag = readTag(version)
+        val tag = input.readTag(this.version)
 
         val metaFormat = io.resolveMetaFormat(tag.metaFormatKey)
             ?: error("Meta format with key ${tag.metaFormatKey} not found")
 
-        val meta: Meta = limit(tag.metaSize.toInt()).run {
+        val meta: Meta = input.limit(tag.metaSize.toInt()).run {
             metaFormat.run {
-                readObject()
+                readObject(input)
             }
         }
 
@@ -95,7 +99,7 @@ class TaggedEnvelopeFormat(
         val dataSize: ULong
     )
 
-    enum class VERSION(val tagSize: UInt) {
+    public enum class VERSION(public val tagSize: UInt) {
         DF02(20u),
         DF03(24u)
     }
@@ -107,7 +111,7 @@ class TaggedEnvelopeFormat(
         }
     }
 
-    companion object : EnvelopeFormatFactory {
+    public companion object : EnvelopeFormatFactory {
         private const val START_SEQUENCE = "#~"
         private const val END_SEQUENCE = "~#\r\n"
 
@@ -158,14 +162,14 @@ class TaggedEnvelopeFormat(
 
         private val default by lazy { invoke() }
 
-        override fun Input.readPartial(): PartialEnvelope =
+        override fun readPartial(input: Input): PartialEnvelope =
-            default.run { readPartial() }
+            default.run { readPartial(input) }
 
-        override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta) =
+        override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta): Unit =
             default.run { writeEnvelope(envelope, metaFormatFactory, formatMeta) }
 
-        override fun Input.readObject(): Envelope =
+        override fun readObject(input: Input): Envelope =
-            default.run { readObject() }
+            default.run { readObject(input) }
 
 
     }

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt

@@ -7,15 +7,20 @@ import hep.dataforge.meta.Meta
 import hep.dataforge.meta.get
 import hep.dataforge.meta.isEmpty
 import hep.dataforge.meta.string
+import hep.dataforge.names.Name
 import hep.dataforge.names.asName
 import kotlinx.io.*
 import kotlinx.io.text.readUtf8Line
 import kotlinx.io.text.writeUtf8String
 import kotlin.collections.set
 
-class TaglessEnvelopeFormat(
+/**
-    val io: IOPlugin,
+ * A text envelope format with human-readable tag.
-    val meta: Meta = Meta.EMPTY
+ * TODO add description
+ */
+public class TaglessEnvelopeFormat(
+    public val io: IOPlugin,
+    public val meta: Meta = Meta.EMPTY
 ) : EnvelopeFormat {
 
     private val metaStart = meta[META_START_PROPERTY].string ?: DEFAULT_META_START
@@ -54,10 +59,10 @@ class TaglessEnvelopeFormat(
         }
     }
 
-    override fun Input.readObject(): Envelope {
+    override fun readObject(input: Input): Envelope {
         var line: String
         do {
-            line = readUtf8Line() // ?: error("Input does not contain tagless envelope header")
+            line = input.readUtf8Line() // ?: error("Input does not contain tagless envelope header")
         } while (!line.startsWith(TAGLESS_ENVELOPE_HEADER))
         val properties = HashMap<String, String>()
 
@@ -70,8 +75,8 @@ class TaglessEnvelopeFormat(
                 properties[key] = value
             }
             //If can't read line, return envelope without data
-            if (exhausted()) return SimpleEnvelope(Meta.EMPTY, null)
+            if (input.exhausted()) return SimpleEnvelope(Meta.EMPTY, null)
-            line = readUtf8Line()
+            line = input.readUtf8Line()
         }
 
         var meta: Meta = Meta.EMPTY
@@ -80,19 +85,19 @@ class TaglessEnvelopeFormat(
             val metaFormat = properties[META_TYPE_PROPERTY]?.let { io.resolveMetaFormat(it) } ?: JsonMetaFormat
             val metaSize = properties[META_LENGTH_PROPERTY]?.toInt()
             meta = if (metaSize != null) {
-                limit(metaSize).run {
+                input.limit(metaSize).run {
-                    metaFormat.run { readObject() }
+                    metaFormat.run { readObject(input) }
                 }
             } else {
                 metaFormat.run {
-                    readObject()
+                    readObject(input)
                 }
             }
         }
 
         do {
             try {
-                line = readUtf8Line()
+                line = input.readUtf8Line()
             } catch (ex: EOFException) {
                 //returning an Envelope without data if end of input is reached
                 return SimpleEnvelope(meta, null)
@@ -100,24 +105,24 @@ class TaglessEnvelopeFormat(
         } while (!line.startsWith(dataStart))
 
         val data: Binary? = if (properties.containsKey(DATA_LENGTH_PROPERTY)) {
-            readBinary(properties[DATA_LENGTH_PROPERTY]!!.toInt())
+            input.readBinary(properties[DATA_LENGTH_PROPERTY]!!.toInt())
 //            val bytes = ByteArray(properties[DATA_LENGTH_PROPERTY]!!.toInt())
 //            readByteArray(bytes)
 //            bytes.asBinary()
         } else {
             Binary {
-                copyTo(this)
+                input.copyTo(this)
             }
         }
 
         return SimpleEnvelope(meta, data)
     }
 
-    override fun Input.readPartial(): PartialEnvelope {
+    override fun readPartial(input: Input): PartialEnvelope {
         var offset = 0u
         var line: String
         do {
-            line = readUtf8Line()// ?: error("Input does not contain tagless envelope header")
+            line = input.readUtf8Line()// ?: error("Input does not contain tagless envelope header")
             offset += line.encodeToByteArray().size.toUInt()
         } while (!line.startsWith(TAGLESS_ENVELOPE_HEADER))
         val properties = HashMap<String, String>()
@@ -131,7 +136,7 @@ class TaglessEnvelopeFormat(
                 properties[key] = value
             }
             try {
-                line = readUtf8Line()
+                line = input.readUtf8Line()
                 offset += line.encodeToByteArray().size.toUInt()
             } catch (ex: EOFException) {
                 return PartialEnvelope(Meta.EMPTY, offset.toUInt(), 0.toULong())
@@ -145,8 +150,8 @@ class TaglessEnvelopeFormat(
             val metaSize = properties[META_LENGTH_PROPERTY]?.toInt()
             meta = if (metaSize != null) {
                 offset += metaSize.toUInt()
-                limit(metaSize).run {
+                input.limit(metaSize).run {
-                    metaFormat.run { readObject() }
+                    metaFormat.run { readObject(input) }
                 }
             } else {
                 error("Can't partially read an envelope with undefined meta size")
@@ -154,7 +159,7 @@ class TaglessEnvelopeFormat(
         }
 
         do {
-            line = readUtf8Line() //?: return PartialEnvelope(Meta.EMPTY, offset.toUInt(), 0.toULong())
+            line = input.readUtf8Line() //?: return PartialEnvelope(Meta.EMPTY, offset.toUInt(), 0.toULong())
             offset += line.encodeToByteArray().size.toUInt()
             //returning an Envelope without data if end of input is reached
         } while (!line.startsWith(dataStart))
@@ -168,26 +173,26 @@ class TaglessEnvelopeFormat(
         META_KEY put meta
     }
 
-    companion object : EnvelopeFormatFactory {
+    public companion object : EnvelopeFormatFactory {
 
         private val propertyPattern = "#\\?\\s*(?<key>[\\w.]*)\\s*:\\s*(?<value>[^;]*);?".toRegex()
 
-        const val META_TYPE_PROPERTY = "metaType"
+        public const val META_TYPE_PROPERTY: String = "metaType"
-        const val META_LENGTH_PROPERTY = "metaLength"
+        public const val META_LENGTH_PROPERTY: String = "metaLength"
-        const val DATA_LENGTH_PROPERTY = "dataLength"
+        public const val DATA_LENGTH_PROPERTY: String = "dataLength"
 
 
-        const val TAGLESS_ENVELOPE_TYPE = "tagless"
+        public const val TAGLESS_ENVELOPE_TYPE: String = "tagless"
 
-        const val TAGLESS_ENVELOPE_HEADER = "#~DFTL~#"
+        public const val TAGLESS_ENVELOPE_HEADER: String = "#~DFTL~#"
-        const val META_START_PROPERTY = "metaSeparator"
+        public const val META_START_PROPERTY: String = "metaSeparator"
-        const val DEFAULT_META_START = "#~META~#"
+        public const val DEFAULT_META_START: String = "#~META~#"
-        const val DATA_START_PROPERTY = "dataSeparator"
+        public const val DATA_START_PROPERTY: String = "dataSeparator"
-        const val DEFAULT_DATA_START = "#~DATA~#"
+        public const val DEFAULT_DATA_START: String = "#~DATA~#"
 
-        const val code: Int = 0x4446544c //DFTL
+        public const val code: Int = 0x4446544c //DFTL
 
-        override val name = TAGLESS_ENVELOPE_TYPE.asName()
+        override val name: Name = TAGLESS_ENVELOPE_TYPE.asName()
 
         override fun invoke(meta: Meta, context: Context): EnvelopeFormat {
             return TaglessEnvelopeFormat(context.io, meta)
@@ -195,14 +200,14 @@ class TaglessEnvelopeFormat(
 
         private val default by lazy { invoke() }
 
-        override fun Input.readPartial(): PartialEnvelope =
+        override fun readPartial(input: Input): PartialEnvelope =
-            default.run { readPartial() }
+            default.run { readPartial(input) }
 
-        override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta) =
+        override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta): Unit =
             default.run { writeEnvelope(envelope, metaFormatFactory, formatMeta) }
 
-        override fun Input.readObject(): Envelope =
+        override fun readObject(input: Input): Envelope =
-            default.run { readObject() }
+            default.run { readObject(input) }
 
         override fun peekFormat(io: IOPlugin, input: Input): EnvelopeFormat? {
             return try {

dataforge-io/src/commonTest/kotlin/hep/dataforge/io/MetaFormatTest.kt

@@ -8,11 +8,11 @@ import kotlin.test.Test
 import kotlin.test.assertEquals
 
 fun Meta.toByteArray(format: MetaFormat = JsonMetaFormat) = buildByteArray {
-    format.run { writeObject(this@toByteArray) }
+    format.writeObject(this@buildByteArray, this@toByteArray)
 }
 
 fun MetaFormat.fromByteArray(packet: ByteArray): Meta {
-    return packet.asBinary().read { readObject() }
+    return packet.asBinary().read { readObject(this) }
 }
 
 class MetaFormatTest {

dataforge-io/src/commonTest/kotlin/hep/dataforge/io/ioTestUtils.kt

@@ -3,5 +3,5 @@ package hep.dataforge.io
 import kotlinx.io.ByteArrayInput
 import kotlinx.io.use
 
-fun <T : Any> IOFormat<T>.toByteArray(obj: T): ByteArray = buildByteArray { writeObject(obj) }
+fun <T : Any> IOFormat<T>.toByteArray(obj: T): ByteArray = buildByteArray { writeObject(this, obj) }
-fun <T : Any> IOFormat<T>.readByteArray(array: ByteArray): T = ByteArrayInput(array).use { it.readObject() }
+fun <T : Any> IOFormat<T>.readByteArray(array: ByteArray): T = ByteArrayInput(array).use { readObject(it) }

dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/fileIO.kt

@@ -11,12 +11,12 @@ import java.nio.file.StandardOpenOption
 import kotlin.reflect.full.isSuperclassOf
 import kotlin.streams.asSequence
 
-fun <R> Path.read(block: Input.() -> R): R = asBinary().read(block = block)
+public fun <R> Path.read(block: Input.() -> R): R = asBinary().read(block = block)
 
 /**
  * Write a live output to a newly created file. If file does not exist, throws error
  */
-fun Path.write(block: Output.() -> Unit): Unit {
+public fun Path.write(block: Output.() -> Unit): Unit {
     val stream = Files.newOutputStream(this, StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW)
     stream.asOutput().use(block)
 }
@@ -24,7 +24,7 @@ fun Path.write(block: Output.() -> Unit): Unit {
 /**
  * Create a new file or append to exiting one with given output [block]
  */
-fun Path.append(block: Output.() -> Unit): Unit {
+public fun Path.append(block: Output.() -> Unit): Unit {
     val stream = Files.newOutputStream(
         this,
         StandardOpenOption.WRITE, StandardOpenOption.APPEND, StandardOpenOption.CREATE
@@ -35,7 +35,7 @@ fun Path.append(block: Output.() -> Unit): Unit {
 /**
  * Create a new file or replace existing one using given output [block]
  */
-fun Path.rewrite(block: Output.() -> Unit): Unit {
+public fun Path.rewrite(block: Output.() -> Unit): Unit {
     val stream = Files.newOutputStream(
         this,
         StandardOpenOption.WRITE, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE
@@ -43,9 +43,9 @@ fun Path.rewrite(block: Output.() -> Unit): Unit {
     stream.asOutput().use(block)
 }
 
-fun Path.readEnvelope(format: EnvelopeFormat): Envelope {
+public fun Path.readEnvelope(format: EnvelopeFormat): Envelope {
     val partialEnvelope: PartialEnvelope = asBinary().read {
-        format.run { readPartial() }
+        format.run { readPartial(this@read) }
     }
     val offset: Int = partialEnvelope.dataOffset.toInt()
     val size: Int = partialEnvelope.dataSize?.toInt() ?: (Files.size(this).toInt() - offset)
@@ -58,7 +58,7 @@ fun Path.readEnvelope(format: EnvelopeFormat): Envelope {
  */
 @Suppress("UNCHECKED_CAST")
 @DFExperimental
-inline fun <reified T : Any> IOPlugin.resolveIOFormat(): IOFormat<T>? {
+public inline fun <reified T : Any> IOPlugin.resolveIOFormat(): IOFormat<T>? {
     return ioFormatFactories.find { it.type.isSuperclassOf(T::class) } as IOFormat<T>?
 }
 
@@ -66,7 +66,7 @@ inline fun <reified T : Any> IOPlugin.resolveIOFormat(): IOFormat<T>? {
  * Read file containing meta using given [formatOverride] or file extension to infer meta type.
  * If [path] is a directory search for file starting with `meta` in it
  */
-fun IOPlugin.readMetaFile(path: Path, formatOverride: MetaFormat? = null, descriptor: NodeDescriptor? = null): Meta {
+public fun IOPlugin.readMetaFile(path: Path, formatOverride: MetaFormat? = null, descriptor: NodeDescriptor? = null): Meta {
     if (!Files.exists(path)) error("Meta file $path does not exist")
 
     val actualPath: Path = if (Files.isDirectory(path)) {
@@ -80,7 +80,7 @@ fun IOPlugin.readMetaFile(path: Path, formatOverride: MetaFormat? = null, descri
     val metaFormat = formatOverride ?: resolveMetaFormat(extension) ?: error("Can't resolve meta format $extension")
     return metaFormat.run {
         actualPath.read {
-            readMeta(descriptor)
+            readMeta(this, descriptor)
         }
     }
 }
@@ -89,7 +89,7 @@ fun IOPlugin.readMetaFile(path: Path, formatOverride: MetaFormat? = null, descri
  * Write meta to file using [metaFormat]. If [path] is a directory, write a file with name equals name of [metaFormat].
  * Like "meta.json"
  */
-fun IOPlugin.writeMetaFile(
+public fun IOPlugin.writeMetaFile(
     path: Path,
     meta: Meta,
     metaFormat: MetaFormatFactory = JsonMetaFormat,
@@ -102,7 +102,7 @@ fun IOPlugin.writeMetaFile(
     }
     metaFormat.run {
         actualPath.write {
-            writeMeta(meta, descriptor)
+            writeMeta(this, meta, descriptor)
         }
     }
 }
@@ -111,7 +111,7 @@ fun IOPlugin.writeMetaFile(
  * Return inferred [EnvelopeFormat] if only one format could read given file. If no format accepts file, return null. If
  * multiple formats accepts file, throw an error.
  */
-fun IOPlugin.peekBinaryFormat(path: Path): EnvelopeFormat? {
+public fun IOPlugin.peekBinaryFormat(path: Path): EnvelopeFormat? {
     val binary = path.asBinary()
     val formats = envelopeFormatFactories.mapNotNull { factory ->
         binary.read {
@@ -126,8 +126,8 @@ fun IOPlugin.peekBinaryFormat(path: Path): EnvelopeFormat? {
     }
 }
 
-val IOPlugin.Companion.META_FILE_NAME: String get() = "@meta"
+public val IOPlugin.Companion.META_FILE_NAME: String get() = "@meta"
-val IOPlugin.Companion.DATA_FILE_NAME: String get() = "@data"
+public val IOPlugin.Companion.DATA_FILE_NAME: String get() = "@data"
 
 /**
  * Read and envelope from file if the file exists, return null if file does not exist.
@@ -143,7 +143,7 @@ val IOPlugin.Companion.DATA_FILE_NAME: String get() = "@data"
  * Return null otherwise.
  */
 @DFExperimental
-fun IOPlugin.readEnvelopeFile(
+public fun IOPlugin.readEnvelopeFile(
     path: Path,
     readNonEnvelopes: Boolean = false,
     formatPeeker: IOPlugin.(Path) -> EnvelopeFormat? = IOPlugin::peekBinaryFormat
@@ -182,9 +182,9 @@ fun IOPlugin.readEnvelopeFile(
 /**
  * Write a binary into file. Throws an error if file already exists
  */
-fun <T : Any> IOFormat<T>.writeToFile(path: Path, obj: T) {
+public fun <T : Any> IOFormat<T>.writeToFile(path: Path, obj: T) {
     path.write {
-        writeObject(obj)
+        writeObject(this, obj)
     }
 }
 
@@ -192,7 +192,7 @@ fun <T : Any> IOFormat<T>.writeToFile(path: Path, obj: T) {
  * Write envelope file to given [path] using [envelopeFormat] and optional [metaFormat]
  */
 @DFExperimental
-fun IOPlugin.writeEnvelopeFile(
+public fun IOPlugin.writeEnvelopeFile(
     path: Path,
     envelope: Envelope,
     envelopeFormat: EnvelopeFormat = TaggedEnvelopeFormat,

dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/tcp/EnvelopeClient.kt

@@ -56,10 +56,10 @@ public class EnvelopeClient(
         val outputStream = socket.getOutputStream()
         format.run {
             outputStream.write {
-                writeObject(request)
+                writeObject(this, request)
             }
             logger.debug { "Sent request with type ${request.type} to ${socket.remoteSocketAddress}" }
-            val res = inputStream.readBlocking { readObject() }
+            val res = inputStream.readBlocking { readObject(this) }
             logger.debug { "Received response with type ${res.type} from ${socket.remoteSocketAddress}" }
             return@withContext res
         }

dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/tcp/EnvelopeServer.kt

@@ -74,12 +74,12 @@ public class EnvelopeServer(
             val outputStream = socket.getOutputStream()
             format.run {
                 while (socket.isConnected) {
-                    val request = inputStream.readBlocking { readObject() }
+                    val request = inputStream.readBlocking { readObject(this) }
                     logger.debug { "Accepted request with type ${request.type} from ${socket.remoteSocketAddress}" }
                     if (request.type == SHUTDOWN_ENVELOPE_TYPE) {
                         //Echo shutdown command
                         outputStream.write {
-                            writeObject(request)
+                            writeObject(this, request)
                         }
                         logger.info { "Accepted graceful shutdown signal from ${socket.inetAddress}" }
                         socket.close()
@@ -89,7 +89,7 @@ public class EnvelopeServer(
                     runBlocking {
                         val response = responder.respond(request)
                         outputStream.write {
-                            writeObject(response)
+                            writeObject(this, response)
                         }
                         logger.debug { "Sent response with type ${response.type} to ${socket.remoteSocketAddress}" }
                     }

dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/SimpleWorkspace.kt

@@ -1,7 +1,7 @@
 package hep.dataforge.workspace
 
 import hep.dataforge.context.Context
-import hep.dataforge.context.content
+import hep.dataforge.context.resolve
 import hep.dataforge.context.toMap
 import hep.dataforge.data.DataNode
 import hep.dataforge.meta.Meta
@@ -19,7 +19,7 @@ class SimpleWorkspace(
 ) : Workspace {
 
     override val tasks: Map<Name, Task<*>> by lazy {
-        context.content<Task<*>>(Task.TYPE) + tasks.toMap()
+        context.resolve<Task<*>>(Task.TYPE) + tasks.toMap()
     }
 
     companion object {

dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/WorkspaceBuilder.kt

@@ -27,7 +27,7 @@ interface WorkspaceBuilder {
  * Set the context for future workspcace
  */
 fun WorkspaceBuilder.context(name: String = "WORKSPACE", block: ContextBuilder.() -> Unit = {}) {
-    context = ContextBuilder(name, parentContext).apply(block).build()
+    context = ContextBuilder(parentContext, name).apply(block).build()
 }
 
 inline fun <reified T : Any> WorkspaceBuilder.data(

dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/fileData.kt

@@ -168,7 +168,7 @@ private suspend fun <T : Any> ZipOutputStream.writeNode(
                 val entry = ZipEntry(name)
                 putNextEntry(entry)
                 envelopeFormat.run {
-                    asOutput().writeObject(envelope)
+                    writeObject(asOutput(), envelope)
                 }
             }
             is DataItem.Node -> {

dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/FileDataTest.kt

@@ -30,12 +30,12 @@ class FileDataTest {
     }
 
     object StringIOFormat : IOFormat<String> {
-        override fun Output.writeObject(obj: String) {
+        override fun writeObject(output: Output, obj: String) {
-            writeUtf8String(obj)
+            output.writeUtf8String(obj)
         }
 
-        override fun Input.readObject(): String {
+        override fun readObject(input: Input): String {
-            return readUtf8String()
+            return input.readUtf8String()
         }
 
         override fun toMeta(): Meta = Meta {

settings.gradle.kts

@@ -8,7 +8,7 @@ pluginManagement {
         maven("https://dl.bintray.com/mipt-npm/dev")
     }
 
-    val toolsVersion = "0.6.0-dev-3"
+    val toolsVersion = "0.6.0-dev-4"
     val kotlinVersion = "1.4.0"
 
     plugins {