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Add basic support of virtual threads
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core/camel-support/src/main/java21/org/apache/camel/support/DefaultThreadPoolFactory.java
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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. | ||
| */ | ||
| package org.apache.camel.support; | ||
|
|
||
| import java.util.concurrent.BlockingQueue; | ||
| import java.util.concurrent.ExecutorService; | ||
| import java.util.concurrent.Executors; | ||
| import java.util.concurrent.LinkedBlockingQueue; | ||
| import java.util.concurrent.RejectedExecutionHandler; | ||
| import java.util.concurrent.ScheduledExecutorService; | ||
| import java.util.concurrent.ScheduledThreadPoolExecutor; | ||
| import java.util.concurrent.SynchronousQueue; | ||
| import java.util.concurrent.ThreadFactory; | ||
| import java.util.concurrent.ThreadPoolExecutor; | ||
| import java.util.concurrent.TimeUnit; | ||
|
|
||
| import org.apache.camel.CamelContext; | ||
| import org.apache.camel.CamelContextAware; | ||
| import org.apache.camel.StaticService; | ||
| import org.apache.camel.spi.ThreadPoolFactory; | ||
| import org.apache.camel.spi.ThreadPoolProfile; | ||
| import org.apache.camel.support.service.ServiceSupport; | ||
| import org.apache.camel.util.concurrent.RejectableScheduledThreadPoolExecutor; | ||
| import org.apache.camel.util.concurrent.RejectableThreadPoolExecutor; | ||
| import org.apache.camel.util.concurrent.SizedScheduledExecutorService; | ||
| import org.apache.camel.util.concurrent.ThreadType; | ||
| import org.apache.camel.util.concurrent.ThreadTypeAware; | ||
|
|
||
| /** | ||
| * Factory for thread pools that uses the JDK {@link Executors} for creating the thread pools. | ||
| */ | ||
| public class DefaultThreadPoolFactory extends ServiceSupport implements CamelContextAware, ThreadPoolFactory, StaticService, ThreadTypeAware { | ||
|
|
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| private CamelContext camelContext; | ||
|
|
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| @Override | ||
| public CamelContext getCamelContext() { | ||
| return camelContext; | ||
| } | ||
|
|
||
| @Override | ||
| public void setCamelContext(CamelContext camelContext) { | ||
| this.camelContext = camelContext; | ||
| } | ||
|
|
||
| @Override | ||
| public ExecutorService newCachedThreadPool(ThreadFactory threadFactory) { | ||
| return ThreadPoolFactoryType.from(threadFactory).newCachedThreadPool(threadFactory); | ||
| } | ||
|
|
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| @Override | ||
| public ExecutorService newThreadPool(ThreadPoolProfile profile, ThreadFactory factory) { | ||
| return ThreadPoolFactoryType.from(factory).newThreadPool(profile, factory); | ||
| } | ||
|
|
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| public ExecutorService newThreadPool( | ||
| int corePoolSize, int maxPoolSize, long keepAliveTime, TimeUnit timeUnit, int maxQueueSize, | ||
| boolean allowCoreThreadTimeOut, | ||
| RejectedExecutionHandler rejectedExecutionHandler, ThreadFactory threadFactory) | ||
| throws IllegalArgumentException { | ||
|
|
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| return ThreadPoolFactoryType.from(threadFactory).newThreadPool( | ||
| corePoolSize, maxPoolSize, keepAliveTime, timeUnit, maxQueueSize, allowCoreThreadTimeOut, | ||
| rejectedExecutionHandler, threadFactory); | ||
| } | ||
|
|
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| @Override | ||
| public ScheduledExecutorService newScheduledThreadPool(ThreadPoolProfile profile, ThreadFactory threadFactory) { | ||
| return ThreadPoolFactoryType.from(threadFactory).newScheduledThreadPool(profile, threadFactory); | ||
| } | ||
|
|
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| private enum ThreadPoolFactoryType { | ||
| PLATFORM { | ||
| ExecutorService newCachedThreadPool(ThreadFactory threadFactory) { | ||
| return Executors.newCachedThreadPool(threadFactory); | ||
| } | ||
|
|
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| ExecutorService newThreadPool(ThreadPoolProfile profile, ThreadFactory factory) { | ||
| // allow core thread timeout is default true if not configured | ||
| boolean allow = profile.getAllowCoreThreadTimeOut() != null ? profile.getAllowCoreThreadTimeOut() : true; | ||
| return newThreadPool(profile.getPoolSize(), | ||
| profile.getMaxPoolSize(), | ||
| profile.getKeepAliveTime(), | ||
| profile.getTimeUnit(), | ||
| profile.getMaxQueueSize(), | ||
| allow, | ||
| profile.getRejectedExecutionHandler(), | ||
| factory); | ||
| } | ||
|
|
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| ExecutorService newThreadPool( | ||
| int corePoolSize, int maxPoolSize, long keepAliveTime, TimeUnit timeUnit, int maxQueueSize, | ||
| boolean allowCoreThreadTimeOut, | ||
| RejectedExecutionHandler rejectedExecutionHandler, ThreadFactory threadFactory) | ||
| throws IllegalArgumentException { | ||
|
|
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| // the core pool size must be 0 or higher | ||
| if (corePoolSize < 0) { | ||
| throw new IllegalArgumentException("CorePoolSize must be >= 0, was " + corePoolSize); | ||
| } | ||
|
|
||
| // validate max >= core | ||
| if (maxPoolSize < corePoolSize) { | ||
| throw new IllegalArgumentException( | ||
| "MaxPoolSize must be >= corePoolSize, was " + maxPoolSize + " >= " + corePoolSize); | ||
| } | ||
|
|
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| BlockingQueue<Runnable> workQueue; | ||
| if (corePoolSize == 0 && maxQueueSize <= 0) { | ||
| // use a synchronous queue for direct-handover (no tasks stored on the queue) | ||
| workQueue = new SynchronousQueue<>(); | ||
| // and force 1 as pool size to be able to create the thread pool by the JDK | ||
| corePoolSize = 1; | ||
| maxPoolSize = 1; | ||
| } else if (maxQueueSize <= 0) { | ||
| // use a synchronous queue for direct-handover (no tasks stored on the queue) | ||
| workQueue = new SynchronousQueue<>(); | ||
| } else { | ||
| // bounded task queue to store tasks on the queue | ||
| workQueue = new LinkedBlockingQueue<>(maxQueueSize); | ||
| } | ||
|
|
||
| ThreadPoolExecutor answer | ||
| = new RejectableThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveTime, timeUnit, workQueue); | ||
| answer.setThreadFactory(threadFactory); | ||
| answer.allowCoreThreadTimeOut(allowCoreThreadTimeOut); | ||
| if (rejectedExecutionHandler == null) { | ||
| rejectedExecutionHandler = new ThreadPoolExecutor.CallerRunsPolicy(); | ||
| } | ||
| answer.setRejectedExecutionHandler(rejectedExecutionHandler); | ||
| return answer; | ||
| } | ||
|
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| ScheduledExecutorService newScheduledThreadPool(ThreadPoolProfile profile, ThreadFactory threadFactory) { | ||
| RejectedExecutionHandler rejectedExecutionHandler = profile.getRejectedExecutionHandler(); | ||
| if (rejectedExecutionHandler == null) { | ||
| rejectedExecutionHandler = new ThreadPoolExecutor.CallerRunsPolicy(); | ||
| } | ||
|
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| ScheduledThreadPoolExecutor answer | ||
| = new RejectableScheduledThreadPoolExecutor(profile.getPoolSize(), threadFactory, rejectedExecutionHandler); | ||
| answer.setRemoveOnCancelPolicy(true); | ||
|
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| // need to wrap the thread pool in a sized to guard against the problem that the | ||
| // JDK created thread pool has an unbounded queue (see class javadoc), which mean | ||
| // we could potentially keep adding tasks, and run out of memory. | ||
| if (profile.getMaxPoolSize() > 0) { | ||
| return new SizedScheduledExecutorService(answer, profile.getMaxQueueSize()); | ||
| } else { | ||
| return answer; | ||
| } | ||
| } | ||
| }, | ||
| VIRTUAL { | ||
| @Override | ||
| ExecutorService newCachedThreadPool(ThreadFactory threadFactory) { | ||
| return Executors.newThreadPerTaskExecutor(threadFactory); | ||
| } | ||
|
|
||
| @Override | ||
| ExecutorService newThreadPool(ThreadPoolProfile profile, ThreadFactory factory) { | ||
| return Executors.newThreadPerTaskExecutor(factory); | ||
| } | ||
|
|
||
| @Override | ||
| ExecutorService newThreadPool(int corePoolSize, int maxPoolSize, long keepAliveTime, TimeUnit timeUnit, | ||
| int maxQueueSize, boolean allowCoreThreadTimeOut, | ||
| RejectedExecutionHandler rejectedExecutionHandler, | ||
| ThreadFactory threadFactory) throws IllegalArgumentException { | ||
| return Executors.newThreadPerTaskExecutor(threadFactory); | ||
| } | ||
|
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| @Override | ||
| ScheduledExecutorService newScheduledThreadPool(ThreadPoolProfile profile, ThreadFactory threadFactory) { | ||
| return Executors.newScheduledThreadPool(0, threadFactory); | ||
| } | ||
| }; | ||
|
|
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| static ThreadPoolFactoryType from(ThreadFactory threadFactory) { | ||
| if (ThreadType.current() == ThreadType.PLATFORM) { | ||
| return ThreadPoolFactoryType.PLATFORM; | ||
| } | ||
| return threadFactory instanceof ThreadTypeAware ? | ||
| ThreadPoolFactoryType.VIRTUAL : ThreadPoolFactoryType.PLATFORM; | ||
| } | ||
|
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| abstract ExecutorService newCachedThreadPool(ThreadFactory threadFactory); | ||
|
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| abstract ExecutorService newThreadPool(ThreadPoolProfile profile, ThreadFactory factory); | ||
|
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| abstract ExecutorService newThreadPool( | ||
| int corePoolSize, int maxPoolSize, long keepAliveTime, TimeUnit timeUnit, int maxQueueSize, | ||
| boolean allowCoreThreadTimeOut, | ||
| RejectedExecutionHandler rejectedExecutionHandler, ThreadFactory threadFactory) | ||
| throws IllegalArgumentException; | ||
|
|
||
| abstract ScheduledExecutorService newScheduledThreadPool(ThreadPoolProfile profile, ThreadFactory threadFactory); | ||
| } | ||
| } |
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30
core/camel-util/src/main/java/org/apache/camel/util/concurrent/ThreadType.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| package org.apache.camel.util.concurrent; | ||
|
|
||
| /** | ||
| * Defines the existing type of threads. The virtual threads can only be used with JDK 21+ and the system property | ||
| * {@code camel.threads.virtual.enabled} set to {@code true}. | ||
| */ | ||
| public enum ThreadType { | ||
| PLATFORM, | ||
| VIRTUAL; | ||
|
|
||
| public static ThreadType current() { | ||
| return PLATFORM; | ||
| } | ||
| } |
23 changes: 23 additions & 0 deletions
23
core/camel-util/src/main/java/org/apache/camel/util/concurrent/ThreadTypeAware.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| package org.apache.camel.util.concurrent; | ||
|
|
||
| /** | ||
| * The marker interface indicating whether a given class is thread type aware. | ||
| */ | ||
| public interface ThreadTypeAware { | ||
| } |
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