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+str Add Emitter api for unsafe transformation.
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stream/src/main/scala/org/apache/pekko/stream/Emitter.scala
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/* | ||
* Licensed to the Apache Software Foundation (ASF) under one or more | ||
* contributor license agreements. See the NOTICE file distributed with | ||
* this work for additional information regarding copyright ownership. | ||
* The ASF licenses this file to You under the Apache License, Version 2.0 | ||
* (the "License"); you may not use this file except in compliance with | ||
* the License. You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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package org.apache.pekko.stream | ||
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import org.apache.pekko.annotation.InternalApi | ||
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import scala.util.{ Failure, Success, Try } | ||
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trait Emitter[T] { | ||
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def emit(value: T): Unit | ||
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def fail(throwable: Throwable): Unit | ||
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def complete(): Unit | ||
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def handle(result: Try[T]): Unit = result match { | ||
case Success(value) => emit(value) | ||
case Failure(ex) => fail(ex) | ||
} | ||
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def handle(result: Either[Throwable, T]): Unit = result match { | ||
case Right(value) => emit(value) | ||
case Left(ex) => fail(ex) | ||
} | ||
} | ||
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@InternalApi | ||
private[pekko] trait UnsafeEmitter[T] extends Emitter[T] { | ||
def emitNow(value: T): Unit | ||
def failNow(throwable: Throwable): Unit | ||
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def completeNow(): Unit | ||
def handleNow(result: Try[T]): Unit = result match { | ||
case Success(value) => emitNow(value) | ||
case Failure(ex) => failNow(ex) | ||
} | ||
def handleNow(result: Either[Throwable, T]): Unit = result match { | ||
case Right(value) => emitNow(value) | ||
case Left(ex) => failNow(ex) | ||
} | ||
} |
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stream/src/main/scala/org/apache/pekko/stream/impl/fusing/UnsafeTransformUnordered.scala
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/* | ||
* Licensed to the Apache Software Foundation (ASF) under one or more | ||
* contributor license agreements. See the NOTICE file distributed with | ||
* this work for additional information regarding copyright ownership. | ||
* The ASF licenses this file to You under the Apache License, Version 2.0 | ||
* (the "License"); you may not use this file except in compliance with | ||
* the License. You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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package org.apache.pekko.stream.impl.fusing | ||
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import org.apache.pekko.stream.ActorAttributes.SupervisionStrategy | ||
import org.apache.pekko.stream.Attributes.SourceLocation | ||
import org.apache.pekko.stream.impl.ActorSubscriberMessage | ||
import org.apache.pekko.stream.impl.Stages.DefaultAttributes | ||
import org.apache.pekko.stream.stage.{ GraphStage, GraphStageLogic, InHandler, OutHandler } | ||
import org.apache.pekko.stream._ | ||
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import scala.util.control.NonFatal | ||
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private[pekko] class UnsafeTransformUnordered[In, Out]( | ||
parallelism: Int, | ||
transform: (In, Emitter[Out]) => Unit) | ||
extends GraphStage[FlowShape[In, Out]] { | ||
private val in = Inlet[In]("UnsafeTransformOrdered.in") | ||
private val out = Outlet[Out]("UnsafeTransformOrdered.out") | ||
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override def initialAttributes = DefaultAttributes.mapAsyncUnordered and SourceLocation.forLambda(transform) | ||
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override val shape = FlowShape(in, out) | ||
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override def createLogic(inheritedAttributes: Attributes): GraphStageLogic = | ||
new GraphStageLogic(shape) with InHandler with OutHandler with UnsafeEmitter[Out] { | ||
override def toString = s"UnsafeTransformOrdered.Logic(inFlight=$inFlight, buffer=$buffer)" | ||
import org.apache.pekko.stream.impl.{ Buffer => BufferImpl } | ||
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private val decider = | ||
inheritedAttributes.mandatoryAttribute[SupervisionStrategy].decider | ||
private var inFlight = 0 | ||
private var buffer: org.apache.pekko.stream.impl.Buffer[Out] = _ | ||
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import ActorSubscriberMessage._ | ||
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private val callback: ActorSubscriberMessage => Unit = getAsyncCallback[ActorSubscriberMessage](handle).invoke | ||
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override def emitNow(value: Out): Unit = handle(OnNext(value)) | ||
override def failNow(throwable: Throwable): Unit = handle(OnError(throwable)) | ||
override def completeNow(): Unit = completeStage() | ||
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// TODO check permit | ||
override final def emit(value: Out): Unit = callback(OnNext(value)) | ||
override final def fail(throwable: Throwable): Unit = callback(OnError(throwable)) | ||
override final def complete(): Unit = callback(OnComplete) | ||
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// | ||
private[this] def todo: Int = inFlight + buffer.used | ||
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override def preStart(): Unit = buffer = BufferImpl(parallelism, inheritedAttributes) | ||
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private def isCompleted = isClosed(in) && todo == 0 | ||
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def handle(msg: ActorSubscriberMessage): Unit = { | ||
inFlight -= 1 | ||
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msg match { | ||
case OnNext(elem: Out @unchecked) if elem != null => | ||
if (isAvailable(out)) { | ||
if (!hasBeenPulled(in)) tryPull(in) | ||
push(out, elem) | ||
if (isCompleted) completeStage() | ||
} else buffer.enqueue(elem) | ||
case OnNext(_) => | ||
if (isCompleted) completeStage() | ||
else if (!hasBeenPulled(in)) tryPull(in) | ||
case OnComplete => | ||
completeStage() | ||
case OnError(ex) => | ||
if (decider(ex) == Supervision.Stop) failStage(ex) | ||
else if (isCompleted) completeStage() | ||
else if (!hasBeenPulled(in)) tryPull(in) | ||
} | ||
} | ||
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override def onPush(): Unit = { | ||
try { | ||
val elem = grab(in) | ||
transform(elem, this) | ||
inFlight += 1 | ||
} catch { | ||
case NonFatal(ex) => if (decider(ex) == Supervision.Stop) failStage(ex) | ||
} | ||
if (todo < parallelism && !hasBeenPulled(in)) tryPull(in) | ||
} | ||
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override def onUpstreamFinish(): Unit = { | ||
if (todo == 0) completeStage() | ||
} | ||
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override def onPull(): Unit = { | ||
if (!buffer.isEmpty) push(out, buffer.dequeue()) | ||
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val leftTodo = todo | ||
if (isClosed(in) && leftTodo == 0) completeStage() | ||
else if (leftTodo < parallelism && !hasBeenPulled(in)) tryPull(in) | ||
} | ||
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setHandlers(in, out, this) | ||
} | ||
} |
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