Package org.gudy.azureus2.core3.util

Source Code of org.gudy.azureus2.core3.util.ReferenceCountedDirectByteBuffer

/*
* Created on Jan 26, 2007
* Created by Paul Gardner
* Copyright (C) 2007 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*
* AELITIS, SAS au capital de 63.529,40 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/


package org.gudy.azureus2.core3.util;

import java.nio.ByteBuffer;

public class
ReferenceCountedDirectByteBuffer
  extends DirectByteBuffer
{
  private DirectByteBuffer  basis;
 
  private int  ref_count = 1;
 
  protected
  ReferenceCountedDirectByteBuffer(
    DirectByteBuffer  _basis )
  {
    this( _basis.getBufferInternal());
   
    basis  = _basis;
  }
 
  protected
  ReferenceCountedDirectByteBuffer(
    ByteBuffer    _buffer )
  {
    super( _buffer );
  }
 
  public ReferenceCountedDirectByteBuffer
  duplicate(
    int    offset,
    int    length )
  {
    ByteBuffer  duplicate = getBufferInternal().duplicate();
   
    duplicate.position( duplicate.position() + offset );
   
    duplicate.limitduplicate.position() + length );
   
    ReferenceCountedDirectByteBuffer res = new ReferenceCountedDirectByteBufferDuplicate( duplicate );
   
    return( res );
  }

  public void
  incrementReferenceCount()
  {
    synchronized( this ){
     
      ref_count++;
     
      // System.out.println( "" + this + ": rc=" + ref_count );
    }
  }
 
  public void
  decrementReferenceCount()
  {
    synchronized( this ){
       
      ref_count--;
     
      // System.out.println( "" + this + ": rc=" + ref_count );
     
      if ( ref_count == 0 ){
       
        basis.returnToPool();
      }
    } 
  }
 
  public int
  getReferenceCount()
  {
    return( ref_count );
  }
 
  public void
  returnToPool()
  {
    decrementReferenceCount();
  }
 
  protected class
  ReferenceCountedDirectByteBufferDuplicate
    extends ReferenceCountedDirectByteBuffer
  {
    protected
    ReferenceCountedDirectByteBufferDuplicate(
      ByteBuffer    owner )
    {
      super( owner );
     
      incrementReferenceCount();
    }
   
    public ReferenceCountedDirectByteBuffer
    duplicate(
      int    offset,
      int    length )
    {
      Debug.out( "dup dup" );
     
      return( null );
    }
   
    public void
    returnToPool()
    {
      decrementReferenceCount();
    }
   
    public void
    incrementReferenceCount()
    {
      ReferenceCountedDirectByteBuffer.this.incrementReferenceCount();
    }
   
    public void
    decrementReferenceCount()
    {
      ReferenceCountedDirectByteBuffer.this.decrementReferenceCount();
    }
  }
}
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