| /* |
| * 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.axis2.util.threadpool; |
| |
| import org.apache.axis2.AxisFault; |
| import org.apache.axis2.i18n.Messages; |
| import org.apache.axis2.java.security.AccessController; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import java.security.PrivilegedActionException; |
| import java.security.PrivilegedExceptionAction; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.SynchronousQueue; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * This the thread pool for axis2. This class will be used a singleton |
| * across axis2 engine. <code>ThreadPool</code> is accepts <code>AxisWorkers</code> which has |
| * run method on them and execute this method, using one of the threads |
| * in the thread pool. |
| */ |
| public class ThreadPool implements ThreadFactory { |
| private static final Log log = LogFactory.getLog(ThreadPool.class); |
| protected static long SLEEP_INTERVAL = 1000; |
| private static boolean shutDown; |
| protected ThreadPoolExecutor executor; |
| |
| //integers that define the pool size, with the default values set. |
| private int corePoolSize = 5; |
| private int maxPoolSize = Integer.MAX_VALUE; |
| |
| public ThreadPool() { |
| setExecutor(createDefaultExecutor("Axis2 Task", Thread.NORM_PRIORITY, true)); |
| } |
| |
| public ThreadPool(int corePoolSize, int maxPoolSize) { |
| this.corePoolSize = corePoolSize; |
| this.maxPoolSize = maxPoolSize; |
| setExecutor(createDefaultExecutor("Axis2 Task", Thread.NORM_PRIORITY, true)); |
| } |
| |
| public Executor getExecutor() { |
| return executor; |
| } |
| |
| public void setExecutor(ThreadPoolExecutor executor) { |
| this.executor = executor; |
| } |
| |
| public void execute(Runnable worker) { |
| if (shutDown) { |
| throw new RuntimeException(Messages.getMessage("threadpoolshutdown")); |
| } |
| executor.execute(worker); |
| } |
| |
| /** |
| * A forceful shutdown mechanism for thread pool. |
| */ |
| public void forceShutDown() { |
| if (log.isDebugEnabled()) { |
| log.debug("forceShutDown called. Thread workers will be stopped"); |
| } |
| executor.shutdownNow(); |
| } |
| |
| /** |
| * This is the recommended shutdown method for the thread pool |
| * This will wait till all the workers that are already handed over to the |
| * thread pool get executed. |
| * |
| * @throws org.apache.axis2.AxisFault |
| */ |
| public void safeShutDown() throws AxisFault { |
| synchronized (this) { |
| shutDown = true; |
| } |
| |
| executor.shutdown(); |
| } |
| |
| protected ThreadPoolExecutor createDefaultExecutor(final String name, |
| final int priority, |
| final boolean daemon) { |
| ThreadPoolExecutor rc; |
| if (maxPoolSize == Integer.MAX_VALUE) { |
| rc = new ThreadPoolExecutor(corePoolSize, maxPoolSize, 10, |
| TimeUnit.SECONDS, new SynchronousQueue(), |
| new DefaultThreadFactory(name, daemon, priority)); |
| } else { |
| rc = new ThreadPoolExecutor(corePoolSize, maxPoolSize, 10, |
| TimeUnit.SECONDS, new LinkedBlockingQueue(), |
| new DefaultThreadFactory(name, daemon, priority)); |
| } |
| // FIXME: This API is only in JDK 1.6 - Use reflection? |
| // rc.allowCoreThreadTimeOut(true); |
| return rc; |
| } |
| |
| private static class DefaultThreadFactory implements java.util.concurrent.ThreadFactory { |
| private final String name; |
| private final boolean daemon; |
| private final int priority; |
| |
| public DefaultThreadFactory(String name, boolean daemon, int priority) { |
| this.name = name; |
| this.daemon = daemon; |
| this.priority = priority; |
| } |
| |
| public Thread newThread( |
| final Runnable runnable) { |
| // do the following section as privileged |
| // so that it will work even when java2 security |
| // has been enabled |
| Thread returnThread = null; |
| try { |
| returnThread = (Thread) |
| AccessController.doPrivileged(new PrivilegedExceptionAction<Thread>() { |
| public Thread run() { |
| Thread newThread = |
| new Thread(runnable, name); |
| newThread.setDaemon(daemon); |
| newThread.setPriority(priority); |
| return newThread; |
| } |
| } |
| ); |
| } |
| catch (PrivilegedActionException e) { |
| // note: inner class can't have its own static log variable |
| if (log.isDebugEnabled()) { |
| log.debug("ThreadPoolExecutor.newThread(): Exception from AccessController [" + e.getClass() |
| .getName() + "] for [" + e.getMessage() + "]", e); |
| } |
| } |
| return returnThread; |
| |
| } |
| } |
| } |