| /** |
| * 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; |
| |
| import java.util.concurrent.ThreadFactory; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** A thread that has called {@link Thread#setDaemon(boolean) } with true.*/ |
| @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"}) |
| @InterfaceStability.Unstable |
| public class Daemon extends Thread { |
| |
| { |
| setDaemon(true); // always a daemon |
| } |
| |
| /** |
| * Provide a factory for named daemon threads, |
| * for use in ExecutorServices constructors |
| */ |
| @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"}) |
| public static class DaemonFactory extends Daemon implements ThreadFactory { |
| |
| @Override |
| public Thread newThread(Runnable runnable) { |
| return new Daemon(runnable); |
| } |
| |
| } |
| |
| Runnable runnable = null; |
| /** Construct a daemon thread. */ |
| public Daemon() { |
| super(); |
| } |
| |
| /** Construct a daemon thread. */ |
| public Daemon(Runnable runnable) { |
| super(runnable); |
| this.runnable = runnable; |
| this.setName(((Object)runnable).toString()); |
| } |
| |
| /** Construct a daemon thread to be part of a specified thread group. */ |
| public Daemon(ThreadGroup group, Runnable runnable) { |
| super(group, runnable); |
| this.runnable = runnable; |
| this.setName(((Object)runnable).toString()); |
| } |
| |
| public Runnable getRunnable() { |
| return runnable; |
| } |
| } |