Java tutorial
/* * * * 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.hadoop.util.concurrent; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.util.concurrent.BlockingQueue; import java.util.concurrent.RejectedExecutionHandler; import java.util.concurrent.ThreadFactory; import java.util.concurrent.ThreadPoolExecutor; import java.util.concurrent.TimeUnit; /** An extension of ThreadPoolExecutor that provides additional functionality. * */ public final class HadoopThreadPoolExecutor extends ThreadPoolExecutor { private static final Log LOG = LogFactory.getLog(HadoopThreadPoolExecutor.class); public HadoopThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) { super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue); } public HadoopThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory) { super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory); } public HadoopThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, RejectedExecutionHandler handler) { super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, handler); } public HadoopThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler) { super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory, handler); } @Override protected void beforeExecute(Thread t, Runnable r) { if (LOG.isDebugEnabled()) { LOG.debug("beforeExecute in thread: " + Thread.currentThread().getName() + ", runnable type: " + r.getClass().getName()); } } @Override protected void afterExecute(Runnable r, Throwable t) { super.afterExecute(r, t); ExecutorHelper.logThrowableFromAfterExecute(r, t); } }