    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    }