trnonblockingserver.java

这是一个基于java编写的torrent的P2P源码

/*
 * Created on 02-Jan-2005
 * 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.tracker.server.impl.tcp.nonblocking;

import java.util.*;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;

import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.logging.*;
import org.gudy.azureus2.core3.tracker.server.TRTrackerServerException;
import org.gudy.azureus2.core3.tracker.server.impl.tcp.TRTrackerServerTCP;
import org.gudy.azureus2.core3.util.AEMonitor;
import org.gudy.azureus2.core3.util.AEThread;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.core3.util.SystemTime;

import com.aelitis.azureus.core.networkmanager.VirtualChannelSelector;
import com.aelitis.azureus.core.networkmanager.VirtualServerChannelSelector;
import com.aelitis.azureus.core.networkmanager.VirtualServerChannelSelectorFactory;
import com.aelitis.azureus.core.networkmanager.admin.NetworkAdmin;

/**
 * @author parg
 *
 */

public class  
TRNonBlockingServer 
	extends 	TRTrackerServerTCP
	implements 	VirtualServerChannelSelector.SelectListener
{
	private static final LogIDs LOGID = LogIDs.TRACKER;
	private static final int TIMEOUT_CHECK_INTERVAL = 10*1000;  //10sec
	
	private static final int CLOSE_DELAY			= 5*1000;
	
	private TRNonBlockingServerProcessorFactory	processor_factory;
	
	private final VirtualChannelSelector read_selector;
	private final VirtualChannelSelector write_selector;
	
	private 	  List			connections_to_close 		= new ArrayList();
	
	private		  List		processors					= new ArrayList();
	
	/*
	private long	last_stats_time;
	private long	last_timeouts;
	private long	last_connections;
	*/
	
	private long	total_timeouts;
	private long	total_connections;
	
	public static final int MAX_CONCURRENT_CONNECTIONS	= COConfigurationManager.getIntParameter( "Tracker TCP NonBlocking Conc Max" );
	
	private final AEMonitor this_mon = new AEMonitor( "TRNonBlockingServer" );

	public
	TRNonBlockingServer(
		String								_name,
		int									_port,
		InetAddress							_bind_ip,
		boolean								_apply_ip_filter,
		TRNonBlockingServerProcessorFactory	_processor_factory )
		
		throws TRTrackerServerException
	{
		this( _name, _port, _bind_ip, _apply_ip_filter, true, _processor_factory );
	}
	
	public
	TRNonBlockingServer(
		String								_name,
		int									_port,
		InetAddress							_bind_ip,
		boolean								_apply_ip_filter,
		boolean								_start_up_ready,
		TRNonBlockingServerProcessorFactory	_processor_factory )
		
		throws TRTrackerServerException
	{
		super( _name, _port, false, _apply_ip_filter, _start_up_ready );
		
		processor_factory	= _processor_factory;
		
		read_selector	 	= new VirtualChannelSelector( _name + ":" + _port, VirtualChannelSelector.OP_READ, false );
		write_selector 		= new VirtualChannelSelector( _name + ":" + _port, VirtualChannelSelector.OP_WRITE, true );

		boolean	ok = false;
		
		if ( _port == 0 ){
			
			throw( new TRTrackerServerException( "port of 0 not currently supported"));
		}
		
		try{
			InetSocketAddress	address;
			
			if ( _bind_ip == null ){
				
				_bind_ip = NetworkAdmin.getSingleton().getDefaultBindAddress();
		
				if ( _bind_ip == null ){
					
					address = new InetSocketAddress( _port );
					
				}else{
	
					address = new InetSocketAddress( _bind_ip, _port );			
				}
			}else{
				
				address = new InetSocketAddress(  _bind_ip, _port );	
			}
			
			VirtualServerChannelSelector accept_server = VirtualServerChannelSelectorFactory.createBlocking( address, 0, this );

			
			accept_server.start();
		      
			AEThread	read_thread = 
				new AEThread( "TRTrackerServer:readSelector")
				{
					public void
					runSupport()
					{
						selectLoop( read_selector );
					}
				};
				
			read_thread.setDaemon(true);
				
			read_thread.start();
				
			AEThread	write_thread = 
				new AEThread( "TRTrackerServer:writeSelector")
				{
					public void
					runSupport()
					{
						selectLoop( write_selector );
					}
				};
				
			write_thread.setDaemon(true);
				
			write_thread.start();
			
			AEThread	close_thread = 
				new AEThread( "TRTrackerServer:closeScheduler")
				{
					public void
					runSupport()
					{
						closeLoop();
					}
				};
				
			close_thread.setDaemon(true);
				
			close_thread.start();
			
			Logger.log(new LogEvent(LOGID,
					"TRTrackerServer: Non-blocking listener established on port "
							+ getPort())); 

			ok	= true;
			
		}catch( Throwable e){
			
			Logger.logTextResource(new LogAlert(LogAlert.UNREPEATABLE,
					LogAlert.AT_ERROR, "Tracker.alert.listenfail"), new String[] { ""
					+ getPort() });
						
			throw( new TRTrackerServerException( "TRTrackerServer: accept fails", e ));
			
		}finally{
			
			if ( !ok ){
				
				destroy();
			}
		}
	}
	
	protected void
	selectLoop(
      VirtualChannelSelector	selector )
	{
		long	last_time	= 0;
		
		while( true ){
			
			try{
				selector.select( 100 );
				
					// only use one selector to trigger the timeouts!
				
				if ( selector == read_selector ){
					
					long	now = SystemTime.getCurrentTime();
					
					if ( now < last_time ){
						
						last_time	= now;
						
					}else if ( now - last_time >= TIMEOUT_CHECK_INTERVAL ){
						
						last_time	= now;
						
						checkTimeouts(now);
					}
				}
			}catch( Throwable e ){
				
				Debug.printStackTrace(e);
			}
		}
	}
	
    public void 
	newConnectionAccepted( 
		ServerSocketChannel	server,
		SocketChannel 		channel ) 
    {
        final TRNonBlockingServerProcessor processor = processor_factory.create( this, channel );
        
        int	num_processors;
        
        try{
        	this_mon.enter();
        	
        	total_connections++;
        	
        	processors.add( processor );
        
        	num_processors	= processors.size();
        	
        }finally{
        	
        	this_mon.exit();
        }
        
        if ( 	MAX_CONCURRENT_CONNECTIONS != 0 &&
        		num_processors > MAX_CONCURRENT_CONNECTIONS ){
        	
        	removeAndCloseConnection( processor );
        
        }else if ( 	isIPFilterEnabled() && 
					ip_filter.isInRange( channel.socket().getInetAddress().getHostAddress(), "Tracker" )){
        	
        	removeAndCloseConnection( processor );
        	
        }else{

          VirtualChannelSelector.VirtualSelectorListener read_listener = 
	        	new VirtualChannelSelector.VirtualSelectorListener() 
				{
        	  		private boolean	selector_registered;