package org.apache.maven.plugin.surefire.booterclient.output;
   
   /*
    * 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 org.apache.maven.surefire.util.internal.BlockingQueue;
  import org.apache.maven.surefire.util.internal.BlockingQueueFactory;
  import org.codehaus.plexus.util.cli.StreamConsumer;
  
  /**
   * Knows how to reconstruct *all* the state transmitted over stdout by the forked process.
   *
   * @author Kristian Rosenvold
   */
  public class ThreadedStreamConsumer
      implements StreamConsumer
  {
  
      private final BlockingQueue items = BlockingQueueFactory.createBlockingQueue();
  
      private static final String poison = "Pioson";
  
      private final Thread thread;
  
      private final Pumper pumper;
  
      static class Pumper
          implements Runnable
      {
          private final BlockingQueue queue;
  
          private final StreamConsumer target;
  
          private volatile InterruptedException interruptedException;
  
  
          Pumper( BlockingQueue queue, StreamConsumer target )
          {
              this.queue = queue;
              this.target = target;
          }
  
          public void run()
          {
              try
              {
                  String item = (String) queue.take();
                  //noinspection StringEquality
                  while ( item != poison )
                  {
                      target.consumeLine( item );
                      item = (String) queue.take();
                  }
              }
              catch ( InterruptedException e )
              {
                  this.interruptedException = e;
              }
          }
  
          public InterruptedException getInterruptedException()
          {
              return interruptedException;
          }
      }
  
      public ThreadedStreamConsumer( StreamConsumer target )
      {
          pumper = new Pumper( items, target );
          thread = new Thread( pumper, "ThreadedStreamConsumer" );
          thread.start();
      }
  
      public void consumeLine( String s )
      {
          items.add( s );
      }
  
  
      public void close()
      {
          try
          {
             items.add( poison );
             thread.join();
             //noinspection ThrowableResultOfMethodCallIgnored
             if ( pumper.getInterruptedException() != null )
             {
                 throw pumper.getInterruptedException();
             }
         }
         catch ( InterruptedException e )
         {
             throw new RuntimeException( e );
         }
     }
 }