001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase;
019
020import java.util.concurrent.ThreadFactory;
021import java.util.concurrent.atomic.AtomicInteger;
022import org.apache.yetus.audience.InterfaceAudience;
023
024/**
025 * Thread factory that creates daemon threads
026 */
027@InterfaceAudience.Private
028public class DaemonThreadFactory implements ThreadFactory {
029  private static final AtomicInteger poolNumber = new AtomicInteger(1);
030  private final ThreadGroup group;
031  private final AtomicInteger threadNumber = new AtomicInteger(1);
032  private final String namePrefix;
033
034  public DaemonThreadFactory(String name) {
035    SecurityManager s = System.getSecurityManager();
036    group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
037    namePrefix = name + poolNumber.getAndIncrement() + "-thread-";
038  }
039
040  @Override
041  public Thread newThread(Runnable r) {
042    Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
043    if (!t.isDaemon()) {
044      t.setDaemon(true);
045    }
046    if (t.getPriority() != Thread.NORM_PRIORITY) {
047      t.setPriority(Thread.NORM_PRIORITY);
048    }
049    return t;
050  }
051}