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153 changes: 153 additions & 0 deletions
153
actor/src/main/scala/org/apache/pekko/dispatch/NewVirtualThreadPerTaskExecutor.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| /* | ||
| * 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.dispatch | ||
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| import java.util | ||
| import java.util.Collections | ||
| import java.util.concurrent._ | ||
| import java.util.concurrent.atomic.AtomicInteger | ||
| import java.util.concurrent.locks.ReentrantLock | ||
|
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| private[dispatch] class NewVirtualThreadPerTaskExecutor(threadFactory: ThreadFactory) extends AbstractExecutorService { | ||
| import NewVirtualThreadPerTaskExecutor._ | ||
|
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| /** | ||
| * 0 RUNNING | ||
| * 1 SHUTDOWN | ||
| * 2 TERMINATED | ||
| */ | ||
| private val state = new AtomicInteger(RUNNING) | ||
| private val virtualThreads = ConcurrentHashMap.newKeySet[Thread]() | ||
| private val terminateLock = new ReentrantLock() | ||
| private val terminatedCondition = terminateLock.newCondition() | ||
|
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| override def shutdown(): Unit = { | ||
| shutdown(false) | ||
| } | ||
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| private def shutdown(interrupt: Boolean): Unit = { | ||
| if (!isShutdown) { | ||
| terminateLock.lock() | ||
| try { | ||
| if (isTerminated) { | ||
| () | ||
| } else { | ||
| if (state.compareAndSet(RUNNING, SHUTDOWN) && interrupt) { | ||
| virtualThreads.forEach(thread => { | ||
| if (!thread.isInterrupted) { | ||
| thread.interrupt() | ||
| } | ||
| }) | ||
| } | ||
| tryTerminateAndSignal() | ||
| } | ||
| } finally { | ||
| terminateLock.unlock() | ||
| } | ||
| } | ||
| } | ||
|
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| private def tryTerminateAndSignal(): Unit = { | ||
| if (isTerminated) { | ||
| () | ||
| } | ||
| terminateLock.lock() | ||
| try { | ||
| if (isTerminated) { | ||
| return | ||
| } | ||
| if (virtualThreads.isEmpty && state.compareAndSet(SHUTDOWN, TERMINATED)) { | ||
| terminatedCondition.signalAll() | ||
| } | ||
| } finally { | ||
| terminateLock.unlock() | ||
| } | ||
| } | ||
|
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| override def shutdownNow(): util.List[Runnable] = { | ||
| shutdown(true) | ||
| Collections.emptyList() | ||
| } | ||
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| override def isShutdown: Boolean = state.get() >= SHUTDOWN | ||
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| override def isTerminated: Boolean = state.get() >= TERMINATED | ||
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| private def isRunning: Boolean = state.get() == RUNNING | ||
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| override def awaitTermination(timeout: Long, unit: TimeUnit): Boolean = { | ||
| if (isTerminated) { | ||
| return true | ||
| } | ||
| terminateLock.lock() | ||
| try { | ||
| var nanosRemaining = unit.toNanos(timeout) | ||
| while (!isTerminated && nanosRemaining > 0) { | ||
| nanosRemaining = terminatedCondition.awaitNanos(nanosRemaining) | ||
| } | ||
| } finally { | ||
| terminateLock.unlock() | ||
| } | ||
| isTerminated | ||
| } | ||
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| // TODO AS only this execute method is been used in `Dispatcher.scala`, so `submit` and other methods is not override. | ||
| override def execute(command: Runnable): Unit = { | ||
| if (state.get() >= SHUTDOWN) { | ||
| throw new RejectedExecutionException("Shutdown") | ||
| } | ||
| var started = false; | ||
| try { | ||
| val thread = threadFactory.newThread(Task(this, command)) | ||
| virtualThreads.add(thread) | ||
| if (isRunning) { | ||
| thread.start() | ||
| started = true | ||
| } else { | ||
| onThreadExit(thread) | ||
| } | ||
| } finally { | ||
| if (!started) { | ||
| throw new RejectedExecutionException("Shutdown") | ||
| } | ||
| } | ||
| } | ||
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| private def onThreadExit(thread: Thread): Unit = { | ||
| virtualThreads.remove(thread) | ||
| if (state.get() == SHUTDOWN) { | ||
| tryTerminateAndSignal() | ||
| } | ||
| } | ||
| } | ||
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| private[dispatch] object NewVirtualThreadPerTaskExecutor { | ||
| private final val RUNNING = 0 | ||
| private final val SHUTDOWN = 1 | ||
| private final val TERMINATED = 2 | ||
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| private case class Task(executor: NewVirtualThreadPerTaskExecutor, runnable: Runnable) extends Runnable { | ||
| override def run(): Unit = { | ||
| try { | ||
| runnable.run() | ||
| } finally { | ||
| executor.onThreadExit(Thread.currentThread()) | ||
| } | ||
| } | ||
| } | ||
| } |
50 changes: 50 additions & 0 deletions
50
actor/src/main/scala/org/apache/pekko/dispatch/VirtualThreadSupport.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| /* | ||
| * 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.dispatch | ||
|
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| import java.lang.invoke.{ MethodHandles, MethodType } | ||
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| import java.util.concurrent.ThreadFactory | ||
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| private[dispatch] object VirtualThreadSupport { | ||
|
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| /** | ||
| * Returns if the current Runtime supports virtual threads. | ||
| */ | ||
| def isSupported: Boolean = create("testIsSupported") ne null | ||
|
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| /** | ||
| * Create a virtual thread factory, returns null when failed. | ||
| */ | ||
| def create(prefix: String): ThreadFactory = | ||
| try { | ||
| val builderClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder") | ||
| val ofVirtualClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder$OfVirtual") | ||
| val lookup = MethodHandles.lookup | ||
| val ofVirtualMethod = lookup.findStatic(classOf[Thread], "ofVirtual", MethodType.methodType(ofVirtualClass)) | ||
| var builder = ofVirtualMethod.invoke() | ||
| val nameMethod = lookup.findVirtual(ofVirtualClass, "name", | ||
| MethodType.methodType(ofVirtualClass, classOf[String], classOf[Long])) | ||
| val factoryMethod = lookup.findVirtual(builderClass, "factory", MethodType.methodType(classOf[ThreadFactory])) | ||
| builder = nameMethod.invoke(builder, prefix + "-virtual-thread-", 0L) | ||
| factoryMethod.invoke(builder).asInstanceOf[ThreadFactory] | ||
| } catch { | ||
| case _: Throwable => null | ||
| } | ||
| } |