pre-0.0.3 #46
@ -0,0 +1,55 @@
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package scientifik.kmath.sequential
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.channels.ReceiveChannel
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import kotlinx.coroutines.channels.SendChannel
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import kotlinx.coroutines.channels.toChannel
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interface DoubleProducer : Producer<Double> {
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val arrayOutput: ReceiveChannel<DoubleArray>
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}
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interface DoubleConsumer : Consumer<Double> {
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val arrayInput: SendChannel<DoubleArray>
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}
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abstract class AbstractDoubleProducer(scope: CoroutineScope) : AbstractProducer<Double>(scope), DoubleProducer {
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override suspend fun connectOutput(consumer: Consumer<Double>) {
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if (consumer is DoubleConsumer) {
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arrayOutput.toChannel(consumer.arrayInput)
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} else {
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super.connectOutput(consumer)
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}
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}
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}
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abstract class AbstractDoubleConsumer(scope: CoroutineScope) : AbstractConsumer<Double>(scope), DoubleConsumer {
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override suspend fun connectInput(producer: Producer<Double>) {
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if (producer is DoubleProducer) {
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producer.arrayOutput.toChannel(arrayInput)
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} else {
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super.connectInput(producer)
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}
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}
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}
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abstract class AbstractDoubleProcessor(scope: CoroutineScope) : AbstractProcessor<Double, Double>(scope),
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DoubleProducer, DoubleConsumer {
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override suspend fun connectOutput(consumer: Consumer<Double>) {
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if (consumer is DoubleConsumer) {
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arrayOutput.toChannel(consumer.arrayInput)
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} else {
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super.connectOutput(consumer)
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}
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}
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override suspend fun connectInput(producer: Producer<Double>) {
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if (producer is DoubleProducer) {
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producer.arrayOutput.toChannel(arrayInput)
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} else {
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super.connectInput(producer)
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}
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}
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}
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@ -3,10 +3,12 @@ package scientifik.kmath.sequential
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import kotlinx.atomicfu.atomic
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import kotlinx.atomicfu.update
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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.launch
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import kotlinx.coroutines.sync.Mutex
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import kotlinx.coroutines.sync.withLock
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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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@ -17,7 +19,7 @@ import kotlinx.coroutines.sync.withLock
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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> {
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interface Producer<T> : CoroutineScope {
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val output: ReceiveChannel<T>
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fun connect(consumer: Consumer<T>)
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@ -29,7 +31,7 @@ interface Producer<T> {
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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> {
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interface Consumer<T> : CoroutineScope {
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val input: SendChannel<T>
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fun connect(producer: Producer<T>)
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@ -40,7 +42,9 @@ interface Consumer<T> {
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interface Processor<T, R> : Consumer<T>, Producer<R>
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abstract class AbstractProducer<T>(protected val scope: CoroutineScope) : Producer<T> {
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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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@ -52,17 +56,23 @@ abstract class AbstractProducer<T>(protected val scope: CoroutineScope) : Produc
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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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scope.launch {
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output.toChannel(consumer.input)
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launch {
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connectOutput(consumer)
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}
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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 suspend fun connectOutput(consumer: Consumer<T>) {
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output.toChannel(consumer.input)
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}
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}
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abstract class AbstractConsumer<T>(protected val scope: CoroutineScope) : Consumer<T> {
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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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@ -74,17 +84,21 @@ abstract class AbstractConsumer<T>(protected val scope: CoroutineScope) : Consum
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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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scope.launch {
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producer.output.toChannel(input)
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launch {
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connectInput(producer)
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}
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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 suspend fun connectInput(producer: Producer<T>) {
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producer.output.toChannel(input)
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}
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}
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abstract class AbstracProcessor<T, R>(scope: CoroutineScope) : Processor<T, R>, AbstractProducer<R>(scope) {
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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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@ -97,14 +111,18 @@ abstract class AbstracProcessor<T, R>(scope: CoroutineScope) : Processor<T, R>,
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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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scope.launch {
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producer.output.toChannel(input)
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launch {
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connectInput(producer)
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}
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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 suspend fun connectInput(producer: Producer<T>) {
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producer.output.toChannel(input)
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}
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}
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/**
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@ -116,9 +134,67 @@ class GenericProducer<T>(
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block: suspend ProducerScope<T>.() -> Unit
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) : AbstractProducer<T>(scope) {
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//The generation begins on first request to output
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override val output: ReceiveChannel<T> by lazy { scope.produce(capacity = capacity, block = block) }
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override val output: ReceiveChannel<T> by lazy { produce(capacity = capacity, block = block) }
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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
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) : AbstractProcessor<T, R>(scope) {
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private val _input = Channel<T>(capacity)
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override val input: SendChannel<T> get() = _input
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override val output: ReceiveChannel<R> = _input.map(coroutineContext, process)
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}
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/**
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* A [Processor] that splits the input in fixed chunk size and transforms each chunk
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*/
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class ChunkProcessor<T, R>(
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scope: CoroutineScope,
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chunkSize: Int,
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process: suspend (List<T>) -> R
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) : AbstractProcessor<T, R>(scope) {
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private val _input = Channel<T>(chunkSize)
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override val input: SendChannel<T> get() = _input
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private val chunked = produce<List<T>>(coroutineContext) {
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val list = ArrayList<T>(chunkSize)
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repeat(chunkSize) {
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list.add(_input.receive())
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}
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send(list)
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}
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override val output: ReceiveChannel<R> = chunked.map(coroutineContext, process)
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}
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/**
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* A moving window [Processor]
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*/
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class WindowProcessor<T, R>(
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scope: CoroutineScope,
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window: Int,
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process: suspend (List<T>) -> R
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) : AbstractProcessor<T, R>(scope) {
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override val output: ReceiveChannel<R>
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get() = TODO("not implemented") //To change initializer of created properties use File | Settings | File Templates.
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override val input: SendChannel<T>
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get() = TODO("not implemented") //To change initializer of created properties use File | Settings | File Templates.
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}
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//TODO add circular buffer processor
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/**
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* Thread-safe aggregator of values from input. The aggregator does not store all incoming values, it uses fold procedure
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* to incorporate them into state on-arrival.
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@ -139,7 +215,7 @@ class Reducer<T, S>(
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override val input: SendChannel<T> by lazy {
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//create a channel and start process of reading all elements into aggregator
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Channel<T>(capacity = Channel.RENDEZVOUS).also {
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scope.launch {
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launch {
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it.consumeEach { value -> state.update { fold(it, value) } }
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}
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}
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@ -158,7 +234,7 @@ class Collector<T>(scope: CoroutineScope) : AbstractConsumer<T>(scope) {
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override val input: SendChannel<T> by lazy {
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//create a channel and start process of reading all elements into aggregator
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Channel<T>(capacity = Channel.RENDEZVOUS).also {
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scope.launch {
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launch {
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it.consumeEach { value ->
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mutex.withLock {
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_list.add(value)
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@ -167,4 +243,34 @@ class Collector<T>(scope: CoroutineScope) : AbstractConsumer<T>(scope) {
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}
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}
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}
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}
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}
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/**
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* Convert a sequence to [Producer]
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*/
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fun <T> Sequence<T>.produce(scope: CoroutineScope = GlobalScope) =
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GenericProducer<T>(scope) { forEach { send(it) } }
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/**
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* Convert a [ReceiveChannel] to [Producer]
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*/
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fun <T> ReceiveChannel<T>.produce(scope: CoroutineScope = GlobalScope) =
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GenericProducer<T>(scope) { for (e in this@produce) send(e) }
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/**
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* Create a reducer and connect this producer to reducer
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*/
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fun <T, S> Producer<T>.reduce(initialState: S, fold: suspend (S, T) -> S) =
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Reducer(this, initialState, fold).also { connect(it) }
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/**
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* Create a [Collector] and attach it to this [Producer]
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*/
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fun <T> Producer<T>.collect() =
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Collector<T>(this).also { connect(it) }
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fun <T, R> Producer<T>.process(capacity: Int = Channel.RENDEZVOUS, process: suspend (T) -> R) =
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PipeProcessor(this, capacity, process)
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fun <T, R> Producer<T>.chunk(chunkSize: Int, process: suspend (List<T>) -> R) =
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ChunkProcessor(this, chunkSize, process)
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