/***************************************************************************
* Copyright (C) by Fabrizio Montesi *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Library 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 Library 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. *
* *
* For details about the authors of this software, see the AUTHORS file. *
***************************************************************************/
package jolie.runtime;
import java.util.LinkedList;
import java.util.List;
import jolie.ExecutionThread;
import jolie.net.CommChannel;
import jolie.net.CommMessage;
import jolie.process.LinkInProcess;
/** Internal synchronization link for parallel processes.
*
* @author Fabrizio Montesi
*/
public class InternalLink extends AbstractIdentifiableObject
{
private final List< LinkInProcess.Execution > procsList =
new LinkedList< LinkInProcess.Execution > ();
private int signals = 0;
private final CommMessage linkMessage;
public InternalLink( String id )
{
super( id );
linkMessage = new CommMessage( CommMessage.GENERIC_ID, id, "/", Value.UNDEFINED_VALUE, null );
}
public synchronized void recvMessage( CommChannel channel, CommMessage message )
{
for( int i = 0; i < procsList.size(); i++ ) {
if ( procsList.get( i ).recvMessage( null, linkMessage ) ) {
procsList.remove( i );
return;
}
}
signals++;
}
public synchronized void signForMessage( LinkInProcess.Execution process )
{
if ( signals > 0 && process.recvMessage( null, linkMessage ) ) {
signals--;
} else {
procsList.add( process );
}
}
public synchronized void cancelWaiting( LinkInProcess.Execution process )
{
procsList.remove( process );
}
public static InternalLink getById( String id )
{
return ExecutionThread.currentThread().state().getLink( id );
}
}