/*
* Created on 22 Jun 2006
* Created by Paul Gardner
* Copyright (C) 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.udp;
import java.util.*;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.gudy.azureus2.core3.util.AESemaphore;
public class
UDPConnection
{
private UDPConnectionSet set;
private int id;
private UDPTransportHelper transport;
private List read_buffers = new LinkedList();
private AESemaphore read_buffer_sem = new AESemaphore( "UDPConnection", 64 );
private volatile boolean connected = true;
protected
UDPConnection(
UDPConnectionSet _set,
int _id,
UDPTransportHelper _transport )
{
set = _set;
id = _id;
transport = _transport;
}
protected
UDPConnection(
UDPConnectionSet _set,
int _id )
{
set = _set;
id = _id;
}
protected UDPSelector
getSelector()
{
return( set.getSelector());
}
protected int
getID()
{
return( id );
}
protected void
setID(
int _id )
{
id = _id;
}
public boolean
isIncoming()
{
return( transport.isIncoming());
}
protected void
setSecret(
byte[] session_secret )
{
set.setSecret( this, session_secret );
}
protected void
setTransport(
UDPTransportHelper _transport )
{
transport = _transport;
}
protected UDPTransportHelper
getTransport()
{
return( transport );
}
protected void
receive(
ByteBuffer data )
throws IOException
{
// packets reach us using 8K space regardless of content - trim this back for small protocol
// messages to save memory
int rem = data.remaining();
if ( rem < 256 ){
byte[] temp = new byte[rem];
data.get( temp );
data = ByteBuffer.wrap( temp );
}
read_buffer_sem.reserve();
if ( !connected ){
throw( new IOException( "Transport closed" ));
}
boolean was_empty = false;
synchronized( read_buffers ){
was_empty = read_buffers.size() == 0;
read_buffers.add( data );
}
if ( was_empty ){
transport.canRead();
}
}
protected void
sent()
{
// notification that a packet has been sent
transport.canWrite();
}
protected boolean
canRead()
{
synchronized( read_buffers ){
return( read_buffers.size() > 0 );
}
}
protected boolean
canWrite()
{
return( set.canWrite( this ));
}
protected int
write(
ByteBuffer[] buffers,
int offset,
int length )
throws IOException
{
int written = set.write( this, buffers, offset, length );
// System.out.println( "Connection(" + getID() + ") - write -> " + written );
return( written );
}
protected int
read(
ByteBuffer buffer )
throws IOException
{
int total = 0;
synchronized( read_buffers ){
while( read_buffers.size() > 0 ){
int rem = buffer.remaining();
if ( rem == 0 ){
break;
}
ByteBuffer b = (ByteBuffer)read_buffers.get(0);
int old_limit = b.limit();
if ( b.remaining() > rem ){
b.limit( b.position() + rem );
}
buffer.put( b );
b.limit( old_limit );
total += rem - buffer.remaining();
if ( b.hasRemaining()){
break;
}else{
read_buffers.remove(0);
read_buffer_sem.release();
}
}
}
// System.out.println( "Connection(" + getID() + ") - read -> " +total );
return( total );
}
protected void
close(
String reason )
{
if ( transport != null ){
transport.close( reason );
}else{
closeSupport( reason );
}
}
protected void
failed(
Throwable reason )
{
if ( transport != null ){
transport.failed( reason );
}else{
failedSupport( reason );
}
}
protected void
closeSupport(
String reason )
{
connected = false;
read_buffer_sem.releaseForever();
set.close( this, reason );
}
protected void
failedSupport(
Throwable reason )
{
connected = false;
read_buffer_sem.releaseForever();
set.failed( this, reason );
}
protected boolean
isConnected()
{
return( connected );
}
protected void
poll()
{
if ( transport != null ){
transport.poll();
}
}
}