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
022import org.apache.logging.log4j.core.util.Log4jThread;
023
024/**
025 * ThreadFactory that creates daemon threads for the async loggers.
026 */
027public class DaemonThreadFactory implements ThreadFactory {
028
029    private static final AtomicInteger THREAD_NUMBER = new AtomicInteger(1);
030    private final ThreadGroup group;
031    private final String threadNamePrefix;
032
033    public DaemonThreadFactory(final String threadNamePrefix) {
034        this.threadNamePrefix = threadNamePrefix;
035        final SecurityManager securityManager = System.getSecurityManager();
036        group = (securityManager != null) ? securityManager.getThreadGroup()
037                : Thread.currentThread().getThreadGroup();
038    }
039
040    @Override
041    public Thread newThread(final Runnable runnable) {
042        final Thread thread = new Log4jThread(group, runnable, threadNamePrefix
043                + THREAD_NUMBER.getAndIncrement(), 0);
044        if (!thread.isDaemon()) {
045            thread.setDaemon(true);
046        }
047        if (thread.getPriority() != Thread.NORM_PRIORITY) {
048            thread.setPriority(Thread.NORM_PRIORITY);
049        }
050        return thread;
051    }
052
053}