code: /*
   * 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.
   */
  /*
   * $Id$
   */
  package org.apache.xml.utils;
  
  /**
   * A utility class that wraps the ThreadController, which is used
   * by IncrementalSAXSource for the incremental building of DTM.
   */
  public class ThreadControllerWrapper
  {
    
    /** The ThreadController pool   */
    private static ThreadController m_tpool = new ThreadController();
    
    public static Thread runThread(Runnable runnable, int priority)
    {
      return m_tpool.run(runnable, priority);
    }
    
    public static void waitThread(Thread worker, Runnable task)
      throws InterruptedException
    {
      m_tpool.waitThread(worker, task);
    }
    
    /**
     * Thread controller utility class for incremental SAX source. Must 
     * be overriden with a derived class to support thread pooling.
     *
     * All thread-related stuff is in this class.
     */
    public static class ThreadController
    {
  
      /**
       * Will get a thread from the pool, execute the task
       *  and return the thread to the pool.
       *
       *  The return value is used only to wait for completion
       *
       *
       * NEEDSDOC @param task
       * @param priority if >0 the task will run with the given priority
       *  ( doesn't seem to be used in xalan, since it's allways the default )
       * @return  The thread that is running the task, can be used
       *          to wait for completion
       */
      public Thread run(Runnable task, int priority)
      {
  
        Thread t = new Thread(task);
  
        t.start();
  
        //       if( priority > 0 )
        //      t.setPriority( priority );
        return t;
      }
  
      /**
       *  Wait until the task is completed on the worker
       *  thread.
       *
       * NEEDSDOC @param worker
       * NEEDSDOC @param task
       *
       * @throws InterruptedException
       */
      public void waitThread(Thread worker, Runnable task)
              throws InterruptedException
      {
  
        // This should wait until the transformThread is considered not alive.
        worker.join();
      }
    }
   
  }
  