/*
* Created on 17 Jul 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 org.gudy.azureus2.core3.util;
import java.util.LinkedList;
public class
AsyncDispatcher
{
private String name;
private AEThread2 thread;
private int priority = Thread.NORM_PRIORITY;
private AERunnable queue_head;
private LinkedList<AERunnable> queue_tail;
private AESemaphore queue_sem = new AESemaphore( "AsyncDispatcher" );
private int num_priority;
private int quiesce_after_millis;
public
AsyncDispatcher()
{
this( "AsyncDispatcher", 10000 );
}
public
AsyncDispatcher(
String name )
{
this( name, 10000 );
}
public
AsyncDispatcher(
int quiesce_after_millis )
{
this( "AsyncDispatcher", quiesce_after_millis );
}
public
AsyncDispatcher(
String _name,
int _quiesce_after_millis )
{
name = _name;
quiesce_after_millis = _quiesce_after_millis;
}
public void
dispatch(
AERunnable target )
{
dispatch( target, false );
}
public void
dispatch(
AERunnable target,
boolean is_priority )
{
synchronized( this ){
if ( queue_head == null ){
queue_head = target;
if ( is_priority ){
num_priority++;
}
}else{
if ( queue_tail == null ){
queue_tail = new LinkedList<AERunnable>();
}
if ( is_priority ){
if ( num_priority == 0 ){
queue_tail.add( 0, queue_head );
queue_head = target;
}else{
queue_tail.add( num_priority-1, target );
}
num_priority++;
}else{
queue_tail.add( target );
}
}
if ( thread == null ){
thread =
new AEThread2( name, true )
{
public void
run()
{
while( true ){
queue_sem.reserve( quiesce_after_millis );
AERunnable to_run = null;
synchronized( AsyncDispatcher.this ){
if ( queue_head == null){
queue_tail = null;
thread = null;
break;
}
to_run = queue_head;
if ( queue_tail != null && !queue_tail.isEmpty()){
queue_head = queue_tail.removeFirst();
}else{
queue_head = null;
}
if ( num_priority > 0 ){
num_priority--;
}
}
try{
to_run.runSupport();
}catch( Throwable e ){
Debug.printStackTrace(e);
}
}
}
};
thread.setPriority( priority );
thread.start();
}
}
queue_sem.release();
}
public boolean
isQuiescent()
{
synchronized( this ){
return( thread == null );
}
}
public int
getQueueSize()
{
synchronized( this ){
int result = queue_head == null?0:1;
if ( queue_tail != null ){
result += queue_tail.size();
}
return( result );
}
}
public void
setPriority(
int p )
{
priority = p;
}
public boolean
isDispatchThread()
{
synchronized( this ){
return( thread != null && thread.isCurrentThread());
}
}
}