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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  import org.apache.logging.log4j.core.util.Log4jThread;
23  
24  /**
25   * ThreadFactory that creates daemon threads for the async loggers.
26   */
27  public class DaemonThreadFactory implements ThreadFactory {
28  
29      private static final AtomicInteger THREAD_NUMBER = new AtomicInteger(1);
30      private final ThreadGroup group;
31      private final String threadNamePrefix;
32  
33      public DaemonThreadFactory(final String threadNamePrefix) {
34          this.threadNamePrefix = threadNamePrefix;
35          final SecurityManager securityManager = System.getSecurityManager();
36          group = (securityManager != null) ? securityManager.getThreadGroup()
37                  : Thread.currentThread().getThreadGroup();
38      }
39  
40      @Override
41      public Thread newThread(final Runnable runnable) {
42          final Thread thread = new Log4jThread(group, runnable, threadNamePrefix
43                  + THREAD_NUMBER.getAndIncrement(), 0);
44          if (!thread.isDaemon()) {
45              thread.setDaemon(true);
46          }
47          if (thread.getPriority() != Thread.NORM_PRIORITY) {
48              thread.setPriority(Thread.NORM_PRIORITY);
49          }
50          return thread;
51      }
52  
53  }