/*
* Minha.pt: middleware testing platform.
* Copyright (c) 2011-2014, Universidade do Minho.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package pt.minha.models.global.io;
import java.util.HashSet;
import java.util.Set;
import pt.minha.kernel.simulation.Event;
/**
* Manages waiting on I/O.
*
* @author jop
*/
public abstract class BlockingHelper {
private Set<Event> waiting = new HashSet<Event>();
/**
* Test if ready for I/O operation.
*
* @return true if will not block
*/
public abstract boolean isReady();
/**
* Shloud be called by derived classes when becoming ready.
*/
public void wakeup() {
for(Event ev: waiting)
ev.schedule(0);
waiting.clear();
}
/**
* Queue an event to schedule when ready.
*
* @param ev the event
*/
public void queue(Event ev) {
waiting.add(ev);
}
/**
* Cancel a previously queued event.
*
* @param ev the event
*/
public void cancel(Event ev) {
waiting.remove(ev);
}
}