connectdisconnectmanager.java

这是一个基于java编写的torrent的P2P源码

/*
 * Created on Sep 13, 2004
 * Created by Alon Rohter
 * 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 com.aelitis.azureus.core.networkmanager.impl.tcp;

import java.net.*;
import java.nio.channels.*;
import java.util.*;

import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.config.ParameterListener;
import org.gudy.azureus2.core3.logging.*;
import org.gudy.azureus2.core3.util.*;

import com.aelitis.azureus.core.networkmanager.VirtualChannelSelector;
import com.aelitis.azureus.core.networkmanager.admin.NetworkAdmin;
import com.aelitis.azureus.core.stats.AzureusCoreStats;
import com.aelitis.azureus.core.stats.AzureusCoreStatsProvider;




/**
 * Manages new connection establishment and ended connection termination.
 */
public class ConnectDisconnectManager {
  private static final LogIDs LOGID = LogIDs.NWMAN;

  private static int MIN_SIMULTANIOUS_CONNECT_ATTEMPTS = 3;  
  public static int MAX_SIMULTANIOUS_CONNECT_ATTEMPTS = 5;  //NOTE: WinXP SP2 limits to 10 max at any given time
  static {
    MAX_SIMULTANIOUS_CONNECT_ATTEMPTS = COConfigurationManager.getIntParameter( "network.max.simultaneous.connect.attempts" );
    
    if( MAX_SIMULTANIOUS_CONNECT_ATTEMPTS < 1 ) { //should never happen, but hey
   	 MAX_SIMULTANIOUS_CONNECT_ATTEMPTS = 1;
   	 COConfigurationManager.setParameter( "network.max.simultaneous.connect.attempts", 1 );
    }
    
    MIN_SIMULTANIOUS_CONNECT_ATTEMPTS = MAX_SIMULTANIOUS_CONNECT_ATTEMPTS - 2;
    
    if( MIN_SIMULTANIOUS_CONNECT_ATTEMPTS < 1 ) {
      MIN_SIMULTANIOUS_CONNECT_ATTEMPTS = 1;
    }

    COConfigurationManager.addParameterListener( "network.max.simultaneous.connect.attempts", new ParameterListener() {
      public void parameterChanged( String parameterName ) {
        MAX_SIMULTANIOUS_CONNECT_ATTEMPTS = COConfigurationManager.getIntParameter( "network.max.simultaneous.connect.attempts" );
        MIN_SIMULTANIOUS_CONNECT_ATTEMPTS = MAX_SIMULTANIOUS_CONNECT_ATTEMPTS - 2;
        if( MIN_SIMULTANIOUS_CONNECT_ATTEMPTS < 1 ) {
          MIN_SIMULTANIOUS_CONNECT_ATTEMPTS = 1;
        }
      }
    });
  }
  
  private static final int CONNECT_ATTEMPT_TIMEOUT = 30*1000;  //30sec
  private static final int CONNECT_ATTEMPT_STALL_TIME = 3*1000;  //3sec
  private static final boolean SHOW_CONNECT_STATS = false;
  
  private final VirtualChannelSelector connect_selector = new VirtualChannelSelector( "Connect/Disconnect Manager", VirtualChannelSelector.OP_CONNECT, true );
  
  private final LinkedList new_requests = new LinkedList();
  private final ArrayList canceled_requests = new ArrayList();
  private final AEMonitor	new_canceled_mon= new AEMonitor( "ConnectDisconnectManager:NCM");
  
  private final HashMap pending_attempts = new HashMap();
  
  private final LinkedList 	pending_closes 	= new LinkedList();
  private final Map			delayed_closes	= new HashMap();
  
  private final AEMonitor	pending_closes_mon = new AEMonitor( "ConnectDisconnectManager:PC");
     
  private final Random random = new Random();
  
  
  
  public 
  ConnectDisconnectManager() 
  {
	  Set	types = new HashSet();
	  
	  types.add( AzureusCoreStats.ST_NET_TCP_OUT_CONNECT_QUEUE_LENGTH );
	  types.add( AzureusCoreStats.ST_NET_TCP_OUT_CANCEL_QUEUE_LENGTH );
	  types.add( AzureusCoreStats.ST_NET_TCP_OUT_CLOSE_QUEUE_LENGTH );
	  types.add( AzureusCoreStats.ST_NET_TCP_OUT_PENDING_QUEUE_LENGTH );
		
	  AzureusCoreStats.registerProvider( 
			  types,
			  new AzureusCoreStatsProvider()
			  {
					public void
					updateStats(
						Set		types,
						Map		values )
					{
						if ( types.contains( AzureusCoreStats.ST_NET_TCP_OUT_CONNECT_QUEUE_LENGTH )){
							
							values.put( AzureusCoreStats.ST_NET_TCP_OUT_CONNECT_QUEUE_LENGTH, new Long( new_requests.size()));
						}	
						
						if ( types.contains( AzureusCoreStats.ST_NET_TCP_OUT_CANCEL_QUEUE_LENGTH )){
							
							values.put( AzureusCoreStats.ST_NET_TCP_OUT_CANCEL_QUEUE_LENGTH, new Long( canceled_requests.size()));
						}					

						if ( types.contains( AzureusCoreStats.ST_NET_TCP_OUT_CLOSE_QUEUE_LENGTH )){
							
							values.put( AzureusCoreStats.ST_NET_TCP_OUT_CLOSE_QUEUE_LENGTH, new Long( pending_closes.size()));
						}					

						if ( types.contains( AzureusCoreStats.ST_NET_TCP_OUT_PENDING_QUEUE_LENGTH )){
							
							values.put( AzureusCoreStats.ST_NET_TCP_OUT_PENDING_QUEUE_LENGTH, new Long( pending_attempts.size()));
						}					

					}
			  });
	  
    AEThread loop = new AEThread( "ConnectDisconnectManager" ) {
      public void runSupport() {
        mainLoop();
      }
    };
    loop.setDaemon( true );
    loop.start();    
  }
  

  private void mainLoop() {      
    while( true ) {
      addNewOutboundRequests();
      runSelect();
      doClosings();
    }
  }
  
  
  private void addNewOutboundRequests() {    
    while( pending_attempts.size() < MIN_SIMULTANIOUS_CONNECT_ATTEMPTS ) {
      ConnectionRequest cr = null;
      
      try{
        new_canceled_mon.enter();
      
        if( new_requests.isEmpty() )  break;
        cr = (ConnectionRequest)new_requests.removeFirst();
      }
      finally{
        new_canceled_mon.exit();
      }
      
      if( cr != null ) {
        addNewRequest( cr ); 
      }
    }
  }
  
  

  private void addNewRequest( final ConnectionRequest request ) {
    request.listener.connectAttemptStarted();
    
    try {
      request.channel = SocketChannel.open();
      
      try {  //advanced socket options
        int rcv_size = COConfigurationManager.getIntParameter( "network.tcp.socket.SO_RCVBUF" );
        if( rcv_size > 0 ) {
          if (Logger.isEnabled())
						Logger.log(new LogEvent(LOGID, "Setting socket receive buffer size"
								+ " for outgoing connection [" + request.address + "] to: "
								+ rcv_size));
          request.channel.socket().setReceiveBufferSize( rcv_size );
        }
      
        int snd_size = COConfigurationManager.getIntParameter( "network.tcp.socket.SO_SNDBUF" );
        if( snd_size > 0 ) {
        	if (Logger.isEnabled())
        		Logger.log(new LogEvent(LOGID, "Setting socket send buffer size "
        				+ "for outgoing connection [" + request.address + "] to: "
        				+ snd_size));
          request.channel.socket().setSendBufferSize( snd_size );
        }

        String ip_tos = COConfigurationManager.getStringParameter( "network.tcp.socket.IPTOS" );
        if( ip_tos.length() > 0 ) {
        	if (Logger.isEnabled())
        		Logger.log(new LogEvent(LOGID, "Setting socket TOS field "
        				+ "for outgoing connection [" + request.address + "] to: "
        				+ ip_tos));
          request.channel.socket().setTrafficClass( Integer.decode( ip_tos ).intValue() );
        }

      
        int local_bind_port = COConfigurationManager.getIntParameter( "network.bind.local.port" );
        
        if( local_bind_port > 0 ) {
        	request.channel.socket().setReuseAddress( true );
        }
        
        InetAddress bindIP = NetworkAdmin.getSingleton().getDefaultBindAddress();
        if ( bindIP != null ) {
        	if (Logger.isEnabled()) 	Logger.log(new LogEvent(LOGID, "Binding outgoing connection [" + request.address + "] to local IP address: " + bindIP));
          request.channel.socket().bind( new InetSocketAddress( bindIP, local_bind_port ) );
        }
        else if( local_bind_port > 0 ) {       
        	if (Logger.isEnabled()) Logger.log(new LogEvent(LOGID, "Binding outgoing connection [" + request.address + "] to local port #: " +local_bind_port));
        	request.channel.socket().bind( new InetSocketAddress( local_bind_port ) );     
        }

      }
      catch( Throwable t ) {
        String msg = "Error while processing advanced socket options.";
        Debug.out( msg, t );
        Logger.log(new LogAlert(LogAlert.UNREPEATABLE, msg, t));
        //dont pass the exception outwards, so we will continue processing connection without advanced options set
      }
      
      request.channel.configureBlocking( false );
      request.connect_start_time = SystemTime.getCurrentTime();
      
      if( request.channel.connect( request.address ) ) {  //already connected
        finishConnect( request );
      }
      else {  //not yet connected, so register for connect selection
        pending_attempts.put( request, null );
        
        connect_selector.register( request.channel, new VirtualChannelSelector.VirtualSelectorListener() {
          public boolean selectSuccess( VirtualChannelSelector selector, SocketChannel sc, Object attachment ) {         
            pending_attempts.remove( request );
            finishConnect( request );
            return true;
          }
          
          public void selectFailure( VirtualChannelSelector selector, SocketChannel sc,Object attachment, Throwable msg ) {
            pending_attempts.remove( request );
            
            closeConnection( request.channel );
           
            request.listener.connectFailure( msg );
          }
        }, null );
      }
    }
    catch( Throwable t ) {
      
      String full = request.address.toString();
      String hostname = request.address.getHostName();
      int port = request.address.getPort();
      boolean unresolved = request.address.isUnresolved();
      InetAddress	inet_address = request.address.getAddress();
      String full_sub = inet_address==null?request.address.toString():inet_address.toString();
      String host_address = inet_address==null?request.address.toString():inet_address.getHostAddress();
      
      String msg = "ConnectDisconnectManager::address exception: full="+full+ ", hostname="+hostname+ ", port="+port+ ", unresolved="+unresolved+ ", full_sub="+full_sub+ ", host_address="+host_address;
      if( request.channel != null ) {
        String channel = request.channel.toString();
        String socket = request.channel.socket().toString();
        String local_address = request.channel.socket().getLocalAddress().toString();
        int local_port = request.channel.socket().getLocalPort();
           SocketAddress ra = request.channel.socket().getRemoteSocketAddress();
        String remote_address;
           if( ra != null )  remote_address = ra.toString();
           else remote_address = "<null>";
        int remote_port = request.channel.socket().getPort();

        msg += "\n channel="+channel+ ", socket="+socket+ ", local_address="+local_address+ ", local_port="+local_port+ ", remote_address="+remote_address+ ", remote_port="+remote_port;
      }
      else {
        msg += "\n channel=<null>";
      }
      
      if ( t instanceof UnresolvedAddressException ){
    	  Debug.outNoStack( msg );
      }else{
    	  Debug.out( msg, t );
      }
      
      
      if( request.channel != null ) {
    	  closeConnection( request.channel );
      }
      request.listener.connectFailure( t );
    }
  }
  
  
  
  
  private void finishConnect( ConnectionRequest request ) {
    try {
      if( request.channel.finishConnect() ) {
            
        if( SHOW_CONNECT_STATS ) {
          long queue_wait_time = request.connect_start_time - request.request_start_time;
          long connect_time = SystemTime.getCurrentTime() - request.connect_start_time;
          int num_queued = new_requests.size();
          int num_connecting = pending_attempts.size();
          System.out.println("S: queue_wait_time="+queue_wait_time+
                              ", connect_time="+connect_time+
                              ", num_queued="+num_queued+
                              ", num_connecting="+num_connecting);
        }
        
        //ensure the request hasn't been canceled during the select op
        boolean canceled = false;