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     */
017    package org.apache.logging.log4j.core.async;
018    
019    import java.util.concurrent.ThreadFactory;
020    import java.util.concurrent.atomic.AtomicInteger;
021    
022    /**
023     * ThreadFactory that creates daemon threads for the async loggers.
024     */
025    public 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    }