Migrating streaming to Flow
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@ -1,9 +1,73 @@
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package scientifik.kmath
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import kotlinx.coroutines.CoroutineDispatcher
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlin.coroutines.CoroutineContext
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import kotlin.coroutines.EmptyCoroutineContext
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import kotlinx.coroutines.*
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import kotlinx.coroutines.channels.produce
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import kotlinx.coroutines.flow.*
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val Dispatchers.Math: CoroutineDispatcher get() = Dispatchers.Default
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val Dispatchers.Math: CoroutineDispatcher get() = Dispatchers.Default
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@FlowPreview
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inline class AsyncFlow<T>(val deferredFlow: Flow<Deferred<T>>) : Flow<T> {
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override suspend fun collect(collector: FlowCollector<T>) {
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deferredFlow.collect {
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collector.emit((it.await()))
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}
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}
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}
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@FlowPreview
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fun <T, R> Flow<T>.async(
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dispatcher: CoroutineDispatcher = Dispatchers.Default,
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block: suspend (T) -> R
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): AsyncFlow<R> {
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val flow = map {
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coroutineScope {
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async(dispatcher, start = CoroutineStart.LAZY) { block(it) }
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}
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}
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return AsyncFlow(flow)
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}
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@FlowPreview
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fun <T, R> AsyncFlow<T>.map(action: (T) -> R) = deferredFlow.map { input ->
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coroutineScope {
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async(start = CoroutineStart.LAZY) { action(input.await()) }
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}
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}
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@ExperimentalCoroutinesApi
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@FlowPreview
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suspend fun <T> AsyncFlow<T>.collect(concurrency: Int, collector: FlowCollector<T>){
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require(concurrency >= 0) { "Buffer size should be positive, but was $concurrency" }
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coroutineScope {
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//Starting up to N deferred coroutines ahead of time
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val channel = produce(capacity = concurrency) {
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deferredFlow.collect { value ->
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value.start()
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send(value)
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}
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}
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(channel as Job).invokeOnCompletion {
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if (it is CancellationException && it.cause == null) cancel()
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}
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for (element in channel) {
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collector.emit(element.await())
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}
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val producer = channel as Job
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if (producer.isCancelled) {
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producer.join()
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//throw producer.getCancellationException()
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}
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}
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}
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@ExperimentalCoroutinesApi
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@FlowPreview
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suspend fun <T> AsyncFlow<T>.collect(concurrency: Int, action: suspend (value: T) -> Unit): Unit{
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collect(concurrency, object : FlowCollector<T> {
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override suspend fun emit(value: T) = action(value)
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})
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}
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@ -59,37 +59,4 @@ fun Flow<Double>.chunked(bufferSize: Int) = flow {
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emit(buffer)
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}
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}
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}
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/**
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* Perform parallel mapping of flow elements
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*/
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@InternalCoroutinesApi
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@ExperimentalCoroutinesApi
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@FlowPreview
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fun <T, R> Flow<T>.mapParallel(dispatcher: CoroutineDispatcher = Dispatchers.Default, bufferSize: Int = 16, transform: suspend (T) -> R) : Flow<R>{
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require(bufferSize >= 0) {
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"Buffer size should be positive, but was $bufferSize"
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}
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return flow {
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coroutineScope {
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val channel: ReceiveChannel<Deferred<R>> = produce(capacity = bufferSize) {
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collect { value ->
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send(async(dispatcher) { transform(value) })
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}
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}
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// TODO semantics doesn't play well here and we pay for that with additional object
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(channel as Job).invokeOnCompletion { if (it is CancellationException && it.cause == null) cancel() }
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for (element in channel) {
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emit(element.await())
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}
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val producer = channel as Job
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if (producer.isCancelled) {
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producer.join()
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throw producer.getCancellationException()
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}
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}
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}
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}
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@ -1,24 +1,26 @@
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package scientifik.kmath.streaming
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.InternalCoroutinesApi
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import kotlinx.coroutines.Job
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import kotlinx.coroutines.*
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import kotlinx.coroutines.flow.asFlow
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import kotlinx.coroutines.flow.collect
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import kotlinx.coroutines.flow.flowOf
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import kotlinx.coroutines.runBlocking
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import org.junit.Test
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import scientifik.kmath.async
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import scientifik.kmath.collect
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@ExperimentalCoroutinesApi
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@InternalCoroutinesApi
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@FlowPreview
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class BufferFlowTest {
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@Test(timeout = 2000)
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@Test
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fun mapParallel() {
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runBlocking {
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(1..20).asFlow().mapParallel {
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(1..20).asFlow().async(Dispatchers.IO) {
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println("Started $it")
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@Suppress("BlockingMethodInNonBlockingContext")
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Thread.sleep(200)
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it
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}.collect {
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}.collect(4) {
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println("Completed $it")
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}
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}
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@ -1,36 +0,0 @@
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plugins {
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`multiplatform-config`
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id("kotlinx-atomicfu") version Versions.atomicfuVersion
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}
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kotlin {
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jvm ()
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js()
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sourceSets {
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val commonMain by getting {
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dependencies {
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api(project(":kmath-core"))
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api(project(":kmath-coroutines"))
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compileOnly("org.jetbrains.kotlinx:atomicfu-common:${Versions.atomicfuVersion}")
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}
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}
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val jvmMain by getting {
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dependencies {
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compileOnly("org.jetbrains.kotlinx:atomicfu:${Versions.atomicfuVersion}")
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}
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}
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val jsMain by getting {
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dependencies {
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compileOnly("org.jetbrains.kotlinx:atomicfu-js:${Versions.atomicfuVersion}")
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}
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}
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}
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}
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atomicfu {
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variant = "VH"
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}
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@ -1,82 +0,0 @@
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package scientifik.kmath.streaming
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.ExperimentalCoroutinesApi
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import kotlinx.coroutines.channels.Channel
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import kotlinx.coroutines.channels.produce
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import kotlinx.coroutines.isActive
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import kotlinx.coroutines.sync.Mutex
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import kotlinx.coroutines.sync.withLock
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import scientifik.kmath.structures.Buffer
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import scientifik.kmath.structures.BufferFactory
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/**
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* A processor that collects incoming elements into fixed size buffers
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*/
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@ExperimentalCoroutinesApi
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class JoinProcessor<T>(
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scope: CoroutineScope,
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bufferSize: Int,
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bufferFactory: BufferFactory<T> = Buffer.Companion::boxing
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) : AbstractProcessor<T, Buffer<T>>(scope) {
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private val input = Channel<T>(bufferSize)
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private val output = produce(coroutineContext) {
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val list = ArrayList<T>(bufferSize)
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while (isActive) {
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list.clear()
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repeat(bufferSize) {
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list.add(input.receive())
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}
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val buffer = bufferFactory(bufferSize) { list[it] }
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send(buffer)
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}
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}
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override suspend fun receive(): Buffer<T> = output.receive()
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override suspend fun send(value: T) {
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input.send(value)
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}
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}
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/**
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* A processor that splits incoming buffers into individual elements
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*/
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class SplitProcessor<T>(scope: CoroutineScope) : AbstractProcessor<Buffer<T>, T>(scope) {
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private val input = Channel<Buffer<T>>()
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private val mutex = Mutex()
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private var currentBuffer: Buffer<T>? = null
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private var pos = 0
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override suspend fun receive(): T {
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mutex.withLock {
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while (currentBuffer == null || pos == currentBuffer!!.size) {
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currentBuffer = input.receive()
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pos = 0
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}
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return currentBuffer!![pos].also { pos++ }
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}
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}
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override suspend fun send(value: Buffer<T>) {
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input.send(value)
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}
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}
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@ExperimentalCoroutinesApi
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fun <T> Producer<T>.chunked(chunkSize: Int, bufferFactory: BufferFactory<T>) =
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JoinProcessor<T>(this, chunkSize, bufferFactory).also { connect(it) }
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@ExperimentalCoroutinesApi
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inline fun <reified T : Any> Producer<T>.chunked(chunkSize: Int) =
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JoinProcessor<T>(this, chunkSize, Buffer.Companion::auto).also { connect(it) }
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@ -1,89 +0,0 @@
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package scientifik.kmath.streaming
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import kotlinx.coroutines.sync.Mutex
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import kotlinx.coroutines.sync.withLock
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import scientifik.kmath.structures.Buffer
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import scientifik.kmath.structures.MutableBuffer
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import scientifik.kmath.structures.VirtualBuffer
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/**
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* Thread-safe ring buffer
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*/
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internal class RingBuffer<T>(
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private val buffer: MutableBuffer<T>,
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private var startIndex: Int = 0,
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size: Int = 0
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) : Buffer<T> {
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private val mutex = Mutex()
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override var size: Int = size
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private set
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override fun get(index: Int): T {
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require(index >= 0) { "Index must be positive" }
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require(index < size) { "Index $index is out of circular buffer size $size" }
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return buffer[startIndex.forward(index)]
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}
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fun isFull() = size == buffer.size
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/**
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* Iterator could provide wrong results if buffer is changed in initialization (iteration is safe)
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*/
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override fun iterator(): Iterator<T> = object : AbstractIterator<T>() {
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private var count = size
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private var index = startIndex
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val copy = buffer.copy()
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override fun computeNext() {
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if (count == 0) {
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done()
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} else {
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setNext(copy[index])
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index = index.forward(1)
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count--
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}
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}
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}
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/**
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* A safe snapshot operation
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*/
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suspend fun snapshot(): Buffer<T> {
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mutex.withLock {
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val copy = buffer.copy()
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return VirtualBuffer(size) { i -> copy[startIndex.forward(i)] }
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}
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}
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suspend fun push(element: T) {
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mutex.withLock {
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buffer[startIndex.forward(size)] = element
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if (isFull()) {
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startIndex++
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} else {
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size++
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}
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}
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}
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@Suppress("NOTHING_TO_INLINE")
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private inline fun Int.forward(n: Int): Int = (this + n) % (buffer.size)
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companion object {
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inline fun <reified T : Any> build(size: Int, empty: T): RingBuffer<T> {
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val buffer = MutableBuffer.auto(size) { empty }
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return RingBuffer(buffer)
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}
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/**
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* Slow yet universal buffer
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*/
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fun <T> boxing(size: Int): RingBuffer<T?> {
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val buffer: MutableBuffer<T?> = MutableBuffer.boxing(size) { null }
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return RingBuffer(buffer)
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}
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}
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}
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@ -1,275 +0,0 @@
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package scientifik.kmath.streaming
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.GlobalScope
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import kotlinx.coroutines.channels.*
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import kotlinx.coroutines.isActive
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.sync.Mutex
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import kotlinx.coroutines.sync.withLock
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import scientifik.kmath.structures.Buffer
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import kotlin.coroutines.CoroutineContext
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/**
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* Initial chain block. Could produce an element sequence and be connected to single [Consumer]
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*
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* The general rule is that channel is created on first call. Also each element is responsible for its connection so
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* while the connections are symmetric, the scope, used for making the connection is responsible for cancelation.
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*
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* Also connections are not reversible. Once connected block stays faithful until it finishes processing.
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* Manually putting elements to connected block could lead to undetermined behavior and must be avoided.
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*/
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interface Producer<T> : CoroutineScope {
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fun connect(consumer: Consumer<T>)
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suspend fun receive(): T
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val consumer: Consumer<T>?
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val outputIsConnected: Boolean get() = consumer != null
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//fun close()
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}
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/**
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* Terminal chain block. Could consume an element sequence and be connected to signle [Producer]
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*/
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interface Consumer<T> : CoroutineScope {
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fun connect(producer: Producer<T>)
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suspend fun send(value: T)
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val producer: Producer<T>?
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val inputIsConnected: Boolean get() = producer != null
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//fun close()
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}
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interface Processor<T, R> : Consumer<T>, Producer<R>
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abstract class AbstractProducer<T>(scope: CoroutineScope) : Producer<T> {
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override val coroutineContext: CoroutineContext = scope.coroutineContext
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override var consumer: Consumer<T>? = null
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protected set
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override fun connect(consumer: Consumer<T>) {
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//Ignore if already connected to specific consumer
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if (consumer != this.consumer) {
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if (outputIsConnected) error("The output slot of producer is occupied")
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if (consumer.inputIsConnected) error("The input slot of consumer is occupied")
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this.consumer = consumer
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if (consumer.producer != null) {
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//No need to save the job, it will be canceled on scope cancel
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connectOutput(consumer)
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// connect back, consumer is already set so no circular reference
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consumer.connect(this)
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} else error("Unreachable statement")
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}
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}
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protected open fun connectOutput(consumer: Consumer<T>) {
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launch {
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while (this.isActive) {
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consumer.send(receive())
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}
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}
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}
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}
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abstract class AbstractConsumer<T>(scope: CoroutineScope) : Consumer<T> {
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override val coroutineContext: CoroutineContext = scope.coroutineContext
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override var producer: Producer<T>? = null
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protected set
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override fun connect(producer: Producer<T>) {
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//Ignore if already connected to specific consumer
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if (producer != this.producer) {
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if (inputIsConnected) error("The input slot of consumer is occupied")
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if (producer.outputIsConnected) error("The input slot of producer is occupied")
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this.producer = producer
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//No need to save the job, it will be canceled on scope cancel
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if (producer.consumer != null) {
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connectInput(producer)
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// connect back
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producer.connect(this)
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} else error("Unreachable statement")
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}
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}
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protected open fun connectInput(producer: Producer<T>) {
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launch {
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while (isActive) {
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send(producer.receive())
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}
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}
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}
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}
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abstract class AbstractProcessor<T, R>(scope: CoroutineScope) : Processor<T, R>, AbstractProducer<R>(scope) {
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override var producer: Producer<T>? = null
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protected set
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override fun connect(producer: Producer<T>) {
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//Ignore if already connected to specific consumer
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if (producer != this.producer) {
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if (inputIsConnected) error("The input slot of consumer is occupied")
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if (producer.outputIsConnected) error("The input slot of producer is occupied")
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this.producer = producer
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//No need to save the job, it will be canceled on scope cancel
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if (producer.consumer != null) {
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connectInput(producer)
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// connect back
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producer.connect(this)
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} else error("Unreachable statement")
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}
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}
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protected open fun connectInput(producer: Producer<T>) {
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launch {
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while (isActive) {
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send(producer.receive())
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}
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}
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}
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}
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/**
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* A simple [produce]-based producer
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*/
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class GenericProducer<T>(
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scope: CoroutineScope,
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capacity: Int = Channel.UNLIMITED,
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block: suspend ProducerScope<T>.() -> Unit
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) : AbstractProducer<T>(scope) {
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private val channel: ReceiveChannel<T> by lazy { produce(capacity = capacity, block = block) }
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override suspend fun receive(): T = channel.receive()
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}
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/**
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* A simple pipeline [Processor] block
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*/
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class PipeProcessor<T, R>(
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scope: CoroutineScope,
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capacity: Int = Channel.RENDEZVOUS,
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||||
process: suspend (T) -> R
|
||||
) : AbstractProcessor<T, R>(scope) {
|
||||
|
||||
private val input = Channel<T>(capacity)
|
||||
private val output: ReceiveChannel<R> = input.map(coroutineContext, process)
|
||||
|
||||
override suspend fun receive(): R = output.receive()
|
||||
|
||||
override suspend fun send(value: T) {
|
||||
input.send(value)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* A moving window [Processor] with circular buffer
|
||||
*/
|
||||
class WindowedProcessor<T, R>(
|
||||
scope: CoroutineScope,
|
||||
window: Int,
|
||||
val process: suspend (Buffer<T?>) -> R
|
||||
) : AbstractProcessor<T, R>(scope) {
|
||||
|
||||
private val ringBuffer = RingBuffer.boxing<T>(window)
|
||||
|
||||
private val channel = Channel<R>(Channel.RENDEZVOUS)
|
||||
|
||||
override suspend fun receive(): R {
|
||||
return channel.receive()
|
||||
}
|
||||
|
||||
override suspend fun send(value: T) {
|
||||
ringBuffer.push(value)
|
||||
channel.send(process(ringBuffer.snapshot()))
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Thread-safe aggregator of values from input. The aggregator does not store all incoming values, it uses fold procedure
|
||||
* to incorporate them into state on-arrival.
|
||||
* The current aggregated state could be accessed by [state]. The input channel is inactive unless requested
|
||||
* @param T - the type of the input element
|
||||
* @param S - the type of the aggregator
|
||||
*/
|
||||
class Reducer<T, S>(
|
||||
scope: CoroutineScope,
|
||||
initialState: S,
|
||||
val fold: suspend (S, T) -> S
|
||||
) : AbstractConsumer<T>(scope) {
|
||||
|
||||
var state: S = initialState
|
||||
private set
|
||||
|
||||
private val mutex = Mutex()
|
||||
|
||||
override suspend fun send(value: T) = mutex.withLock {
|
||||
state = fold(state, value)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Collector that accumulates all values in a list. List could be accessed from non-suspending environment via [list] value.
|
||||
*/
|
||||
class Collector<T>(scope: CoroutineScope) : AbstractConsumer<T>(scope) {
|
||||
|
||||
private val _list = ArrayList<T>()
|
||||
private val mutex = Mutex()
|
||||
val list: List<T> get() = _list
|
||||
|
||||
override suspend fun send(value: T) {
|
||||
mutex.withLock {
|
||||
_list.add(value)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Convert a sequence to [Producer]
|
||||
*/
|
||||
fun <T> Sequence<T>.produce(scope: CoroutineScope = GlobalScope) =
|
||||
GenericProducer<T>(scope) { forEach { send(it) } }
|
||||
|
||||
/**
|
||||
* Convert a [ReceiveChannel] to [Producer]
|
||||
*/
|
||||
fun <T> ReceiveChannel<T>.produce(scope: CoroutineScope = GlobalScope) =
|
||||
GenericProducer<T>(scope) { for (e in this@produce) send(e) }
|
||||
|
||||
|
||||
fun <T, C : Consumer<T>> Producer<T>.consumer(consumerFactory: () -> C): C =
|
||||
consumerFactory().also { connect(it) }
|
||||
|
||||
fun <T, R> Producer<T>.map(capacity: Int = Channel.RENDEZVOUS, process: suspend (T) -> R) =
|
||||
PipeProcessor(this, capacity, process).also { connect(it) }
|
||||
|
||||
/**
|
||||
* Create a reducer and connect this producer to reducer
|
||||
*/
|
||||
fun <T, S> Producer<T>.reduce(initialState: S, fold: suspend (S, T) -> S) =
|
||||
Reducer(this, initialState, fold).also { connect(it) }
|
||||
|
||||
/**
|
||||
* Create a [Collector] and attach it to this [Producer]
|
||||
*/
|
||||
fun <T> Producer<T>.collect() =
|
||||
Collector<T>(this).also { connect(it) }
|
||||
|
||||
fun <T, R, P : Processor<T, R>> Producer<T>.process(processorBuilder: () -> P): P =
|
||||
processorBuilder().also { connect(it) }
|
||||
|
||||
fun <T, R> Producer<T>.process(capacity: Int = Channel.RENDEZVOUS, process: suspend (T) -> R) =
|
||||
PipeProcessor<T, R>(this, capacity, process).also { connect(it) }
|
||||
|
||||
|
||||
fun <T, R> Producer<T>.windowed(window: Int, process: suspend (Buffer<T?>) -> R) =
|
||||
WindowedProcessor(this, window, process).also { connect(it) }
|
Loading…
Reference in New Issue
Block a user