hadoop Daemon 源码
haddop Daemon 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/Daemon.java
/**
* 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.
* @param runnable runnable.
*/
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.
* @param group thread group.
* @param runnable runnable.
*/
public Daemon(ThreadGroup group, Runnable runnable) {
super(group, runnable);
this.runnable = runnable;
this.setName(((Object)runnable).toString());
}
public Runnable getRunnable() {
return runnable;
}
}
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