/*
 * JBoss, the OpenSource J2EE webOS
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 *
 */

package org.jboss.resource.connectionmanager;


import java.util.LinkedList;


/**
 * PoolFiller.java
 *
 *
 * Created: Fri Jan  4 13:35:21 2002
 *
 * @author <a href="mailto:d_jencks@users.sourceforge.net">David Jencks</a>
 * @author Scott.Stark@jboss.org
 * @version $Revision: 1.1.24.1 $
 */

public class PoolFiller implements Runnable
{

   private final LinkedList pools = new LinkedList();

   private final Thread fillerThread;

   private static final PoolFiller filler = new PoolFiller();

   public static void fillPool(InternalManagedConnectionPool mcp)
   {
      filler.internalFillPool(mcp);
   }

   public PoolFiller ()
   {
      fillerThread = new Thread(this, "JCA PoolFiller");
      fillerThread.start();
   }

   public void run()
   {
      ClassLoader myClassLoader = getClass().getClassLoader();
      Thread.currentThread().setContextClassLoader(myClassLoader);
      //keep going unless interrupted
      while (true)
      {
         try 
         {
            InternalManagedConnectionPool mcp = null;
            //keep iterating through pools till empty, exception escapes.
            while (true)
            {
                     
               synchronized (pools)
               {
                  mcp = (InternalManagedConnectionPool)pools.removeFirst();
               }
               if (mcp == null) 
               {
                  break;
               } // end of if ()
                        
               mcp.fillToMin();
            } // end of while (true)

         }
         catch (Exception e)
         {//end of pools list
         } // end of try-catch
                        
         try 
         {
            synchronized (pools)
            {
               pools.wait();                        
            }
         }
         catch (InterruptedException ie)
         {
            return;
         } // end of try-catch
      } // end of while ()
   }

   private void internalFillPool(InternalManagedConnectionPool mcp)
   {
      synchronized (pools)
      {
         pools.addLast(mcp);
         pools.notify();
      }
   }
   
}// PoolFiller