dmcheckerimpl.java

一个基于JAVA的多torrent下载程序

/*
 * Created on 31-Jul-2004
 * Created by Paul Gardner
 * Copyright (C) 2004, 2005, 2006 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 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 *
 */

package org.gudy.azureus2.core3.disk.impl.access.impl;

import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.config.ParameterListener;
import org.gudy.azureus2.core3.disk.*;
import org.gudy.azureus2.core3.disk.impl.DiskManagerHelper;
import org.gudy.azureus2.core3.disk.impl.DiskManagerRecheckInstance;
import org.gudy.azureus2.core3.disk.impl.access.DMChecker;
import org.gudy.azureus2.core3.disk.impl.piecemapper.DMPieceList;
import org.gudy.azureus2.core3.disk.impl.piecemapper.DMPieceMapEntry;
import org.gudy.azureus2.core3.logging.*;
import org.gudy.azureus2.core3.util.*;

/**
 * @author parg
 *
 */

public class 
DMCheckerImpl 
	implements DMChecker
{
	protected static final LogIDs LOGID = LogIDs.DISK;
    
	private static boolean	flush_pieces;

    static{
    	
    	 ParameterListener param_listener = new ParameterListener() {
    	    public void 
			parameterChanged( 
				String  str ) 
    	    {
    	  	  flush_pieces		= COConfigurationManager.getBooleanParameter( "diskmanager.perf.cache.flushpieces" );

    	    }
    	 };

 		COConfigurationManager.addAndFireParameterListener( "diskmanager.perf.cache.flushpieces", param_listener );
    }
   
	protected DiskManagerHelper		disk_manager;
		
	protected int			async_checks;
	protected AESemaphore	async_check_sem 	= new AESemaphore("DMChecker::asyncCheck");
	
	protected int			async_reads;
	protected AESemaphore	async_read_sem 		= new AESemaphore("DMChecker::asyncRead");

	private boolean	started;
	
	protected volatile boolean	stopped;
	
	private int			pieceLength;
	private int			lastPieceLength;
	
	protected int		nbPieces;
	
	private volatile boolean	complete_recheck_in_progress;
	private volatile int		complete_recheck_progress;
	
	protected AEMonitor	this_mon	= new AEMonitor( "DMChecker" );
		
	public
	DMCheckerImpl(
		DiskManagerHelper	_disk_manager )
	{
		disk_manager	= _disk_manager;
		
		pieceLength		= disk_manager.getPieceLength();
		lastPieceLength	= disk_manager.getLastPieceLength();
		
		nbPieces		= disk_manager.getNbPieces();
	}

	public void
	start()
	{
		try{
			this_mon.enter();

			if ( started ){
				
				throw( new RuntimeException( "DMChecker: start while started"));
			}
			
			if ( stopped ){
				
				throw( new RuntimeException( "DMChecker: start after stopped"));
			}

			started	= true;
 			
		}finally{
			
			this_mon.exit();
		}
	}
	
	public void
	stop()
	{
		int	check_wait;
		int	read_wait;
		
		try{
			this_mon.enter();

			if ( stopped || !started ){
			
				return;
			}
					
				// when we exit here we guarantee that all file usage operations have completed
				// i.e. writes and checks (checks being doubly async)
			
			stopped	= true;
         			
			read_wait	= async_reads;
			check_wait	= async_checks;
			
		}finally{
			
			this_mon.exit();
		}		
	
			// wait for reads
		
		for (int i=0;i<read_wait;i++){
			
			async_read_sem.reserve();
		}
		
			// wait for checks
		
		for (int i=0;i<check_wait;i++){
			
			async_check_sem.reserve();
		}
	}
	
	public int 
	getCompleteRecheckStatus() 
	{
	   if (complete_recheck_in_progress ){
		   
		   return( complete_recheck_progress );
		   
	   }else{
		   
		   return( -1 );
	   }
	}
	  
	public DiskManagerCheckRequest
	createRequest(
		int 	pieceNumber,
		Object	user_data )
	{
		return( new DiskManagerCheckRequestImpl( pieceNumber, user_data ));
	}
	
	public void 
	enqueueCompleteRecheckRequest(
		final DiskManagerCheckRequest			request,
		final DiskManagerCheckRequestListener 	listener )
	{  	
		complete_recheck_progress		= 0;
		complete_recheck_in_progress	= true;

	 	Thread t = new AEThread("DMChecker::completeRecheck")
		{
	  		public void
			runSupport()
	  		{
	  			DiskManagerRecheckInstance	recheck_inst = disk_manager.getRecheckScheduler().register( disk_manager, true );
	  			
	  			try{	  					
	  				final AESemaphore	sem = new AESemaphore( "DMChecker::completeRecheck" );
	  				
	  				int	checks_submitted	= 0;
	  				           
		            final AESemaphore	 run_sem = new AESemaphore( "DMChecker::completeRecheck:runsem", 2 );
		            
	  				for ( int i=0; i < nbPieces; i++ ){
	  					
	  					run_sem.reserve();
	  					
		  				while( !stopped ){
			  				
			  				if ( recheck_inst.getPermission()){
			  					
			  					break;
			  				}
			  			}

	  					if ( stopped ){
	  						
	  						break;
	  					}
	  					
	  					complete_recheck_progress = 1000*i / nbPieces;
	  					
	  					enqueueCheckRequest( 
	  						createRequest( i, request.getUserData()),
	  	       				new DiskManagerCheckRequestListener()
							{
			  	       			public void 
			  	       			checkCompleted( 
			  	       				DiskManagerCheckRequest 	request,
			  	       				boolean						passed )
			  	       			{
			  	       				try{
			  	       					listener.checkCompleted( request, passed );
			  	       					
			  	       				}catch( Throwable e ){
			  	       					
			  	       					Debug.printStackTrace(e);
			  	       					
			  	       				}finally{
			  	       					
			  	       					complete();
			  	       				}
			  	       			}
			  	       			 
			  	       			public void
			  	       			checkCancelled(
			  	       				DiskManagerCheckRequest		request )
			  	       			{
			  	       				try{
			  	       					listener.checkCancelled( request );
			  	       					
			  	       				}catch( Throwable e ){
			  	       					
			  	       					Debug.printStackTrace(e);
			  	       					
			  	       				}finally{
			  	       				
			  	       					complete();
			  	       				}
			  	       			}
			  	       			
			  	       			public void 
			  	       			checkFailed( 
			  	       				DiskManagerCheckRequest 	request, 
			  	       				Throwable		 			cause )
			  	       			{
			  	       				try{
			  	       					listener.checkFailed( request, cause );
			  	       					
			  	       				}catch( Throwable e ){
			  	       					
			  	       					Debug.printStackTrace(e);
			  	       					
			  	       				}finally{
			  	       				
			  	       					complete();
			  	       				}			  	       			}
			  	       			
			  	       			protected void
			  	       			complete()
			  	       			{
	  	       						run_sem.release();
		  	       						
	  	       						sem.release();
		  	       				}
							},
							false );
	  					
	  					checks_submitted++;
	  				}
	  					  					
	  					// wait for all to complete
	  					
	  				for (int i=0;i<checks_submitted;i++){
	  						
	  					sem.reserve();
	  				}
	  	       }finally{
	  	       	
	  	       		complete_recheck_in_progress	= false;
	  	       		
	  	       		recheck_inst.unregister();
	  	       }
	        }     			
	 	};