cvs commit: jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/exec ProcessDestroyer.java

[do...@apache.org]

donaldp     01/12/22 19:42:18

  Added:       proposal/myrmidon/src/java/org/apache/myrmidon/framework/exec
                        ProcessDestroyer.java
  Log:
  MOve ProcessDestroyer into myrmidon hierarchy
  
  Revision  Changes    Path
  1.1                  jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/exec/ProcessDestroyer.java
  
  Index: ProcessDestroyer.java
  ===================================================================
  /*
   * Copyright (C) The Apache Software Foundation. All rights reserved.
   *
   * This software is published under the terms of the Apache Software License
   * version 1.1, a copy of which has been included with this distribution in
   * the LICENSE.txt file.
   */
  package org.apache.myrmidon.framework.exec;
  
  import java.lang.reflect.Method;
  import java.util.ArrayList;
  import java.util.Iterator;
  
  /**
   * Destroys all registered <code>Process</code>es when
   * the VM exits (if in JDK1.3) or when requested.
   *
   * @author <a href="mailto:mnewcomb@tacintel.com">Michael Newcomb</a>
   * @author <a href="mailto:peter@apache.org">Peter Donald</a>
   * @version $Revision: 1.1 $ $Date: 2001/12/23 03:42:18 $
   */
  public class ProcessDestroyer
      extends Thread
  {
      private ArrayList m_processes = new ArrayList();
  
      /**
       * Constructs a <code>ProcessDestroyer</code> and registers it as a shutdown
       * hook.
       */
      public ProcessDestroyer()
      {
          try
          {
              // check to see if the method exists (support pre-JDK 1.3 VMs)
              //
              final Class[] paramTypes = {Thread.class};
              final Method addShutdownHook =
                  Runtime.class.getMethod( "addShutdownHook", paramTypes );
  
              // add the hook
              Object[] args = {this};
              addShutdownHook.invoke( Runtime.getRuntime(), args );
          }
          catch( final Exception e )
          {
              // it just won't be added as a shutdown hook... :(
          }
      }
  
      /**
       * Add process to list of processes to be shutdown.
       *
       * @param process the process to add
       */
      public synchronized void add( final Process process )
      {
          if( !m_processes.contains( process ) )
          {
              m_processes.add( process );
          }
      }
  
      /**
       * Remove process from list of processes to be shutdown.
       *
       * @param process the process to remove
       */
      public synchronized void remove( final Process process )
      {
          m_processes.remove( process );
      }
  
      /**
       * Invoked by the VM when it is exiting.
       */
      public void run()
      {
          destroyProcesses();
      }
  
      protected synchronized void destroyProcesses()
      {
          final Iterator processes = m_processes.iterator();
          while( processes.hasNext() )
          {
              ( (Process)processes.next() ).destroy();
              processes.remove();
          }
      }
  }
  
  
  

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