001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.async;
018
019import java.util.concurrent.ThreadFactory;
020import java.util.concurrent.atomic.AtomicInteger;
021
022/**
023 * ThreadFactory that creates daemon threads for the async loggers.
024 */
025public class DaemonThreadFactory implements ThreadFactory {
026
027    final ThreadGroup group;
028    final AtomicInteger threadNumber = new AtomicInteger(1);
029    final String threadNamePrefix;
030
031    public DaemonThreadFactory(final String threadNamePrefix) {
032        this.threadNamePrefix = threadNamePrefix;
033        final SecurityManager securityManager = System.getSecurityManager();
034        group = (securityManager != null) ? securityManager.getThreadGroup()
035                : Thread.currentThread().getThreadGroup();
036    }
037
038    @Override
039    public Thread newThread(final Runnable runnable) {
040        final Thread thread = new Thread(group, runnable, threadNamePrefix
041                + threadNumber.getAndIncrement(), 0);
042        if (!thread.isDaemon()) {
043            thread.setDaemon(true);
044        }
045        if (thread.getPriority() != Thread.NORM_PRIORITY) {
046            thread.setPriority(Thread.NORM_PRIORITY);
047        }
048        return thread;
049    }
050
051}