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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements. See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache license, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License. You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the license for the specific language governing permissions and
    15   * limitations under the license.
    16   */
    17  package org.apache.logging.log4j.core.async;
    18
    19  import java.util.concurrent.ThreadFactory;
    20  import java.util.concurrent.atomic.AtomicInteger;
    21
    22  /**
    23   * ThreadFactory that creates daemon threads for the async loggers.
    24   */
    25  public class DaemonThreadFactory implements ThreadFactory {
    26
    27      final ThreadGroup group;
    28      final AtomicInteger threadNumber = new AtomicInteger(1);
    29      final String threadNamePrefix;
    30
    31      public DaemonThreadFactory(final String threadNamePrefix) {
    32          this.threadNamePrefix = threadNamePrefix;
    33          final SecurityManager securityManager = System.getSecurityManager();
    34          group = (securityManager != null) ? securityManager.getThreadGroup()
    35                  : Thread.currentThread().getThreadGroup();
    36      }
    37
    38      @Override
    39      public Thread newThread(final Runnable runnable) {
    40          final Thread thread = new Thread(group, runnable, threadNamePrefix
    41                  + threadNumber.getAndIncrement(), 0);
    42          if (!thread.isDaemon()) {
    43              thread.setDaemon(true);
    44          }
    45          if (thread.getPriority() != Thread.NORM_PRIORITY) {
    46              thread.setPriority(Thread.NORM_PRIORITY);
    47          }
    48          return thread;
    49      }
    50
    51  }