package org.apache.maven.surefire.util.internal;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.atomic.AtomicInteger;
  
  /**
   * Creates new daemon Thread.
   */
  public final class DaemonThreadFactory
      implements ThreadFactory
  {
      private static final AtomicInteger POOL_NUMBER = new AtomicInteger( 1 );
  
      private final AtomicInteger threadNumber = new AtomicInteger( 1 );
  
      private final ThreadGroup group;
  
      private final String namePrefix;
  
      private DaemonThreadFactory()
      {
          SecurityManager s = System.getSecurityManager();
          group = s != null ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
          namePrefix = "pool-" + POOL_NUMBER.getAndIncrement() + "-thread-";
      }
  
      @Override
      public Thread newThread( Runnable r )
      {
          Thread t = new Thread( group, r, namePrefix + threadNumber.getAndIncrement() );
          if ( t.getPriority() != Thread.NORM_PRIORITY )
          {
              t.setPriority( Thread.NORM_PRIORITY );
          }
          t.setDaemon( true );
          return t;
      }
  
      /**
       * Should be used by thread pools.
       * @return new instance of {@link ThreadFactory} where each {@link Thread thread} is daemon
       */
      public static ThreadFactory newDaemonThreadFactory()
      {
          return new DaemonThreadFactory();
      }
  
      public static ThreadFactory newDaemonThreadFactory( String name )
      {
          return new NamedThreadFactory( name );
      }
  
      public static Thread newDaemonThread( Runnable r )
      {
          SecurityManager s = System.getSecurityManager();
          ThreadGroup group = s == null ? Thread.currentThread().getThreadGroup() : s.getThreadGroup();
          Thread t = new Thread( group, r );
          if ( t.getPriority() != Thread.NORM_PRIORITY )
          {
              t.setPriority( Thread.NORM_PRIORITY );
          }
          t.setDaemon( true );
          return t;
      }
  
      public static Thread newDaemonThread( Runnable r, String name )
      {
          SecurityManager s = System.getSecurityManager();
          ThreadGroup group = s == null ? Thread.currentThread().getThreadGroup() : s.getThreadGroup();
          Thread t = new Thread( group, r, name );
          if ( t.getPriority() != Thread.NORM_PRIORITY )
          {
              t.setPriority( Thread.NORM_PRIORITY );
          }
          t.setDaemon( true );
          return t;
      }
  
      private static class NamedThreadFactory
          implements ThreadFactory
     {
 
         private final String name;
 
         private NamedThreadFactory( String name )
         {
             this.name = name;
         }
 
         @Override
         public Thread newThread( Runnable r )
         {
             return newDaemonThread( r, name );
         }
     }
 }