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Add basic support of virtual threads
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208 changes: 208 additions & 0 deletions
208
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; | ||
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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; | ||
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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.ThreadFactoryTypeAware; | ||
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/** | ||
* Factory for thread pools that uses the JDK {@link Executors} for creating the thread pools. | ||
*/ | ||
public class DefaultThreadPoolFactory extends ServiceSupport implements CamelContextAware, ThreadPoolFactory, StaticService { | ||
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private CamelContext camelContext; | ||
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@Override | ||
public CamelContext getCamelContext() { | ||
return camelContext; | ||
} | ||
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@Override | ||
public void setCamelContext(CamelContext camelContext) { | ||
this.camelContext = camelContext; | ||
} | ||
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@Override | ||
public ExecutorService newCachedThreadPool(ThreadFactory threadFactory) { | ||
return ThreadPoolFactoryType.from(threadFactory, Integer.MAX_VALUE).newCachedThreadPool(threadFactory); | ||
} | ||
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@Override | ||
public 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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public ExecutorService newThreadPool( | ||
int corePoolSize, int maxPoolSize, long keepAliveTime, TimeUnit timeUnit, int maxQueueSize, | ||
boolean allowCoreThreadTimeOut, | ||
RejectedExecutionHandler rejectedExecutionHandler, ThreadFactory threadFactory) | ||
throws IllegalArgumentException { | ||
// the core pool size must be 0 or higher | ||
if (corePoolSize < 0) { | ||
throw new IllegalArgumentException("CorePoolSize must be >= 0, was " + corePoolSize); | ||
} | ||
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// validate max >= core | ||
if (maxPoolSize < corePoolSize) { | ||
throw new IllegalArgumentException( | ||
"MaxPoolSize must be >= corePoolSize, was " + maxPoolSize + " >= " + corePoolSize); | ||
} | ||
return ThreadPoolFactoryType.from(threadFactory, corePoolSize, maxPoolSize, maxQueueSize).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, profile).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( | ||
int corePoolSize, int maxPoolSize, long keepAliveTime, TimeUnit timeUnit, int maxQueueSize, | ||
boolean allowCoreThreadTimeOut, | ||
RejectedExecutionHandler rejectedExecutionHandler, ThreadFactory threadFactory) | ||
throws IllegalArgumentException { | ||
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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); | ||
} | ||
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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); | ||
} | ||
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@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, ThreadPoolProfile profile) { | ||
return from(threadFactory, profile.getPoolSize(), profile.getMaxPoolSize(), profile.getMaxQueueSize()); | ||
} | ||
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static ThreadPoolFactoryType from(ThreadFactory threadFactory, int corePoolSize, int maxPoolSize, int maxQueueSize) { | ||
return from(threadFactory, corePoolSize == 0 && maxQueueSize <= 0 ? 1 : maxPoolSize); | ||
} | ||
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static ThreadPoolFactoryType from(ThreadFactory threadFactory, int maxPoolSize) { | ||
if (ThreadType.current() == ThreadType.PLATFORM) { | ||
return ThreadPoolFactoryType.PLATFORM; | ||
} | ||
return maxPoolSize > 1 && threadFactory instanceof ThreadFactoryTypeAware factoryTypeAware && factoryTypeAware.isVirtual() ? | ||
ThreadPoolFactoryType.VIRTUAL : ThreadPoolFactoryType.PLATFORM; | ||
} | ||
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abstract ExecutorService newCachedThreadPool(ThreadFactory threadFactory); | ||
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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; | ||
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abstract ScheduledExecutorService newScheduledThreadPool(ThreadPoolProfile profile, ThreadFactory threadFactory); | ||
} | ||
} |
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32 changes: 32 additions & 0 deletions
32
core/camel-util/src/main/java/org/apache/camel/util/concurrent/ThreadFactoryTypeAware.java
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@@ -0,0 +1,32 @@ | ||
/* | ||
* 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; | ||
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import java.util.concurrent.ThreadFactory; | ||
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/** | ||
* The interface indicating whether the created threads are virtual or not. | ||
*/ | ||
public interface ThreadFactoryTypeAware extends ThreadFactory { | ||
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/** | ||
* Indicates whether the created threads are virtual. | ||
* | ||
* @return {@code true} if the created threads are virtual, {@code false} if they are platform threads. | ||
*/ | ||
boolean isVirtual(); | ||
} |
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