/*
* Created on 23 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 org.gudy.azureus2.core3.util.AESemaphore;
import org.gudy.azureus2.core3.util.AEThread2;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.core3.util.SystemTime;
import com.aelitis.azureus.core.networkmanager.impl.TransportHelper;
public class
UDPSelector
{
private static final int POLL_FREQUENCY = 100;
private List ready_set = new LinkedList();
private AESemaphore ready_sem = new AESemaphore( "UDPSelector" );
private volatile boolean destroyed;
protected
UDPSelector(
final UDPConnectionManager manager )
{
new AEThread2( "UDPSelector", true )
{
public void
run()
{
boolean quit = false;
long last_poll = 0;
while( !quit ){
if ( destroyed ){
// one last dispatch cycle
quit = true;
}
long now = SystemTime.getCurrentTime();
if ( now < last_poll || now - last_poll >= POLL_FREQUENCY ){
manager.poll();
last_poll = now;
}
if ( ready_sem.reserve(POLL_FREQUENCY/2)){
Object[] entry;
synchronized( ready_set ){
if ( ready_set.size() == 0 ){
continue;
}
entry = (Object[])ready_set.remove(0);
}
TransportHelper transport = (TransportHelper)entry[0];
TransportHelper.selectListener listener = (TransportHelper.selectListener)entry[1];
if ( listener == null ){
Debug.out( "Null listener" );
}else{
Object attachment = entry[2];
try{
if ( entry.length == 3 ){
listener.selectSuccess( transport, attachment );
}else{
listener.selectFailure( transport, attachment, (Throwable)entry[3] );
}
}catch( Throwable e ){
Debug.printStackTrace(e);
}
}
}
}
}
}.start();
}
protected void
destroy()
{
synchronized( ready_set ){
destroyed = true;
}
}
protected void
ready(
TransportHelper transport,
TransportHelper.selectListener listener,
Object attachment )
{
boolean removed = false;
synchronized( ready_set ){
if( destroyed ){
Debug.out( "Selector has been destroyed" );
throw( new RuntimeException( "Selector has been destroyed" ));
}
Iterator it = ready_set.iterator();
while( it.hasNext()){
Object[] entry = (Object[])it.next();
if ( entry[1] == listener ){
it.remove();
removed = true;
break;
}
}
ready_set.add( new Object[]{ transport, listener, attachment });
}
if ( !removed ){
ready_sem.release();
}
}
protected void
ready(
TransportHelper transport,
TransportHelper.selectListener listener,
Object attachment,
Throwable error )
{
boolean removed = false;
synchronized( ready_set ){
if( destroyed ){
Debug.out( "Selector has been destroyed" );
throw( new RuntimeException( "Selector has been destroyed" ));
}
Iterator it = ready_set.iterator();
while( it.hasNext()){
Object[] entry = (Object[])it.next();
if ( entry[1] == listener ){
it.remove();
removed = true;
break;
}
}
ready_set.add( new Object[]{ transport, listener, attachment, error });
}
if ( !removed ){
ready_sem.release();
}
}
protected void
cancel(
TransportHelper transport,
TransportHelper.selectListener listener )
{
synchronized( ready_set ){
Iterator it = ready_set.iterator();
while( it.hasNext()){
Object[] entry = (Object[])it.next();
if ( entry[0] == transport && entry[1] == listener ){
it.remove();
break;
}
}
}
}
}