dmcheckerimpl.java

这是一个基于java编写的torrent的P2P源码

/*
 * 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.DiskManagerFileInfoImpl;
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.*;

import com.aelitis.azureus.core.diskmanager.cache.CacheFile;

/**
 * @author parg
 *
 */

public class 
DMCheckerImpl 
	implements DMChecker
{
	protected static final LogIDs LOGID = LogIDs.DISK;
    
	private static boolean	flush_pieces;
	private static boolean	checking_read_priority;
	
    static{
    	
    	 ParameterListener param_listener = new ParameterListener() {
    	    public void 
			parameterChanged( 
				String  str ) 
    	    {
    	   	    flush_pieces				= COConfigurationManager.getBooleanParameter( "diskmanager.perf.cache.flushpieces" );
    	   	  	checking_read_priority		= COConfigurationManager.getBooleanParameter( "diskmanager.perf.checking.read.priority" );

    	    }
    	 };

 		COConfigurationManager.addAndFireParameterListeners( 
 			new String[]{
 				"diskmanager.perf.cache.flushpieces",
 				"diskmanager.perf.checking.read.priority" },
 				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();
		}		
	
		long	log_time 		= SystemTime.getCurrentTime();
		
			// wait for reads
		
		for (int i=0;i<read_wait;i++){
			
			long	now = SystemTime.getCurrentTime();

			if ( now < log_time ){
				
				log_time = now;
				
			}else{
								
				if ( now - log_time > 1000 ){
					
					log_time	= now;
					
					if ( Logger.isEnabled()){
						
						Logger.log(new LogEvent(disk_manager, LOGID, "Waiting for check-reads to complete - " + (read_wait-i) + " remaining" ));
					}
				}
			}
			
			async_read_sem.reserve();
		}
		
		log_time 		= SystemTime.getCurrentTime();

			// wait for checks
		
		for (int i=0;i<check_wait;i++){
			
			long	now = SystemTime.getCurrentTime();

			if ( now < log_time ){
				
				log_time = now;
				
			}else{
								
				if ( now - log_time > 1000 ){
					
					log_time	= now;
					
					if ( Logger.isEnabled()){
						
						Logger.log(new LogEvent(disk_manager, LOGID, "Waiting for checks to complete - " + (read_wait-i) + " remaining" ));
					}
				}
			}
			
			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++ ){
	  					
	  					complete_recheck_progress = 1000*i / nbPieces;
	  					
	  					DiskManagerPiece	dm_piece = disk_manager.getPiece(i);
	  					
  							// only recheck the piece if it happens to be done (a complete dnd file that's
  							// been set back to dnd for example) or the piece is part of a non-dnd file 
  					
	  					if ( dm_piece.isDone() || !dm_piece.isSkipped()){

		  					run_sem.reserve();
		  					
			  				while( !stopped ){
				  				
				  				if ( recheck_inst.getPermission()){
				  					
				  					break;
				  				}
				  			}
	
		  					if ( stopped ){
		  						
		  						break;
		  					}
		  					
		  					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();
	  	       }
	        }     			
	 	};