/*
* 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.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import org.gudy.azureus2.core3.util.Debug;
import com.aelitis.azureus.core.networkmanager.impl.TransportHelper;
public class
UDPTransportHelper
implements TransportHelper
{
public static final int READ_TIMEOUT = 30*1000;
public static final int CONNECT_TIMEOUT = 60*1000;
private UDPConnectionManager manager;
private UDPSelector selector;
private InetSocketAddress address;
private UDPTransport transport;
private boolean incoming;
private UDPConnection connection;
private selectListener read_listener;
private Object read_attachment;
private boolean read_selects_paused;
private selectListener write_listener;
private Object write_attachment;
private boolean write_selects_paused = true; // default is paused
private boolean closed;
private IOException failed;
private ByteBuffer pending_partial_write;
private Map user_data;
protected
UDPTransportHelper(
UDPConnectionManager _manager,
InetSocketAddress _address,
UDPTransport _transport )
throws IOException
{
// outgoing
manager = _manager;
address = _address;
transport = _transport;
incoming = false;
connection = manager.registerOutgoing( this );
selector = connection.getSelector();
}
protected
UDPTransportHelper(
UDPConnectionManager _manager,
InetSocketAddress _address,
UDPConnection _connection )
{
// incoming
manager = _manager;
address = _address;
connection = _connection;
incoming = true;
selector = connection.getSelector();
}
protected void
setTransport(
UDPTransport _transport )
{
transport = _transport;
}
protected UDPTransport
getTransport()
{
return( transport );
}
protected int
getMss()
{
if ( transport == null ){
return( UDPNetworkManager.getUdpMssSize());
}
return( transport.getMssSize());
}
public boolean
minimiseOverheads()
{
return( UDPNetworkManager.MINIMISE_OVERHEADS );
}
public int
getConnectTimeout()
{
return( CONNECT_TIMEOUT );
}
public int
getReadTimeout()
{
return( READ_TIMEOUT );
}
public InetSocketAddress
getAddress()
{
return( address );
}
public String
getName()
{
return( " (UDP)" );
}
public boolean
isIncoming()
{
return( incoming );
}
protected UDPConnection
getConnection()
{
return( connection );
}
public boolean
delayWrite(
ByteBuffer buffer)
{
// TODO: support this one day?
return false;
}
public boolean
hasDelayedWrite()
{
return( false );
}
public int
write(
ByteBuffer buffer,
boolean partial_write )
throws IOException
{
synchronized( this ){
if ( failed != null ){
throw( failed );
}
if ( closed ){
throw( new IOException( "Transport closed" ));
}
}
if ( partial_write ){
if ( pending_partial_write == null ){
if ( buffer.remaining() < UDPConnectionSet.MIN_WRITE_PAYLOAD ){
ByteBuffer copy = ByteBuffer.allocate( buffer.remaining());
copy.put( buffer );
copy.position( 0 );
pending_partial_write = copy;
return( copy.remaining());
}
}
}
if ( pending_partial_write != null ){
try{
int pw_len = pending_partial_write.remaining();
int written = connection.write( new ByteBuffer[]{ pending_partial_write, buffer }, 0, 2 );
if ( written >= pw_len ){
return( written - pw_len );
}else{
return( 0 );
}
}finally{
if ( pending_partial_write.remaining() == 0 ){
pending_partial_write = null;
}
}
}else{
return( connection.write( new ByteBuffer[]{ buffer }, 0, 1 ));
}
}
public long
write(
ByteBuffer[] buffers,
int array_offset,
int length )
throws IOException
{
synchronized( this ){
if ( failed != null ){
throw( failed );
}
if ( closed ){
throw( new IOException( "Transport closed" ));
}
}
if ( pending_partial_write != null ){
ByteBuffer[] buffers2 = new ByteBuffer[length+1];
buffers2[0] = pending_partial_write;
int pos = 1;
for (int i=array_offset;i<array_offset+length;i++){
buffers2[pos++] = buffers[i];
}
try{
int pw_len = pending_partial_write.remaining();
int written = connection.write( buffers2, 0, buffers2.length );
if ( written >= pw_len ){
return( written - pw_len );
}else{
return( 0 );
}
}finally{
if ( pending_partial_write.remaining() == 0 ){
pending_partial_write = null;
}
}
}else{
return( connection.write( buffers, array_offset, length ));
}
}
public int
read(
ByteBuffer buffer )
throws IOException
{
synchronized( this ){
if ( failed != null ){
throw( failed );
}
if ( closed ){
throw( new IOException( "Transport closed" ));
}
}
return( connection.read( buffer ));
}
public long
read(
ByteBuffer[] buffers,
int array_offset,
int length )
throws IOException
{
synchronized( this ){
if ( failed != null ){
throw( failed );
}
if ( closed ){
throw( new IOException( "Transport closed" ));
}
}
long total = 0;
for (int i=array_offset;i<array_offset+length;i++){
ByteBuffer buffer = buffers[i];
int max = buffer.remaining();
int read = connection.read( buffer );
total += read;
if ( read < max ){
break;
}
}
//System.out.println( "total = " + total );
return( total );
}
protected void
canRead()
{
fireReadSelect();
}
protected void
canWrite()
{
fireWriteSelect();
}
public synchronized void
pauseReadSelects()
{
if ( read_listener != null ){
selector.cancel( this, read_listener );
}
read_selects_paused = true;
}
public synchronized void
pauseWriteSelects()
{
if ( write_listener != null ){
selector.cancel( this, write_listener );
}
write_selects_paused = true;
}
public synchronized void
resumeReadSelects()
{
read_selects_paused = false;
fireReadSelect();
}
public synchronized void
resumeWriteSelects()
{
write_selects_paused = false;
fireWriteSelect();
}
public void
registerForReadSelects(
selectListener listener,
Object attachment )
{
synchronized( this ){
read_listener = listener;
read_attachment = attachment;
}
resumeReadSelects();
}
public void
registerForWriteSelects(
selectListener listener,
Object attachment )
{
synchronized( this ){
write_listener = listener;
write_attachment = attachment;
}
resumeWriteSelects();
}
public synchronized void
cancelReadSelects()
{
selector.cancel( this, read_listener );
read_selects_paused = true;
read_listener = null;
read_attachment = null;
}
public synchronized void
cancelWriteSelects()
{
selector.cancel( this, write_listener );
write_selects_paused = true;
write_listener = null;
write_attachment = null;
}
protected void
fireReadSelect()
{
synchronized( this ){
if ( read_listener != null && !read_selects_paused ){
if ( failed != null ){
selector.ready( this, read_listener, read_attachment, failed );
}else if ( closed ){
selector.ready( this, read_listener, read_attachment, new Throwable( "Transport closed" ));
}else if ( connection.canRead()){
selector.ready( this, read_listener, read_attachment );
}
}
}
}
protected void
fireWriteSelect()
{
synchronized( this ){
if ( write_listener != null && !write_selects_paused ){
if ( failed != null ){
write_selects_paused = true;
selector.ready( this, write_listener, write_attachment, failed );
}else if ( closed ){
write_selects_paused = true;
selector.ready( this, write_listener, write_attachment, new Throwable( "Transport closed" ));
}else if ( connection.canWrite()){
write_selects_paused = true;
selector.ready( this, write_listener, write_attachment );
}
}
}
}
public void
failed(
Throwable reason )
{
synchronized( this ){
if ( reason instanceof IOException ){
failed = (IOException)reason;
}else{
failed = new IOException( Debug.getNestedExceptionMessageAndStack(reason));
}
fireReadSelect();
fireWriteSelect();
}
connection.failedSupport( reason );
}
public void
close(
String reason )
{
synchronized( this ){
closed = true;
fireReadSelect();
fireWriteSelect();
}
connection.closeSupport( reason );
}
protected void
poll()
{
synchronized( this ){
fireReadSelect();
fireWriteSelect();
}
}
public synchronized void
setUserData(
Object key,
Object data )
{
if ( user_data == null ){
user_data = new HashMap();
}
user_data.put( key, data );
}
public synchronized Object
getUserData(
Object key )
{
if ( user_data == null ){
return(null);
}
return( user_data.get( key ));
}
public void
setTrace(
boolean on )
{
}
public void setScatteringMode(long forBytes) {
// currently not implemented for UDP
}
}