/*
* Title: CloudSim Toolkit
* Description: CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
* Licence: GPL - http://www.gnu.org/copyleft/gpl.html
*
* Copyright (c) 2009-2012, The University of Melbourne, Australia
*/
package org.cloudbus.cloudsim.core.predicates;
import org.cloudbus.cloudsim.core.SimEvent;
/**
* Predicates are used to select events from the deferred queue. This class is abstract and must be
* extended when writing a new predicate. Some standard predicates are provided.<br>
* The idea of simulation predicates was copied from SimJava 2.
*
* @author Marcos Dias de Assuncao
* @since CloudSim Toolkit 1.0
* @see PredicateType
* @see PredicateFrom
* @see PredicateAny
* @see PredicateNone
* @see Simulation
*/
public abstract class Predicate {
/**
* The match function which must be overridden when writing a new predicate. The function is
* called with each event in the deferred queue as its parameter when a
* <code>Simulation.select()</code> call is made by the user.
*
* @param event The event to test for a match.
* @return The function should return <code>true</code> if the event matches and should be
* selected, or <code>false</code> if it does not match the predicate.
*/
public abstract boolean match(SimEvent event);
}