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//******************************************************************************
//
// File: Event.java
// Package: edu.rit.sim
// Unit: Class edu.rit.sim.Event
//
// This Java source file is copyright (C) 2011 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ 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 3 of the License, or (at your option) any later version.
//
// PJ 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.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.sim;
/**
* Class Event is the abstract base class for an event in a discrete event
* simulation.
*
* @author Alan Kaminsky
* @version 29-Jul-2011
*/
public abstract class Event
{
// Hidden data members.
// Simulation in which this event occurs.
Simulation sim;
// Simulation time of this event.
double time;
// Exported constructors.
/**
* Construct a new event.
*/
public Event()
{
}
// Exported operations.
/**
* Returns the simulation in which this event occurs.
*
* @return Simulation.
*/
public final Simulation simulation()
{
return sim;
}
/**
* Returns this event's simulation time, the time when this event is
* scheduled to take place.
*
* @return Simulation time.
*/
public final double time()
{
return time;
}
/**
* Schedule the given event to be performed at the given time in this
* event's simulation.
*
* @param t Simulation time for <TT>event</TT>.
* @param event Event to be performed.
*
* @exception IllegalArgumentException
* (unchecked exception) Thrown if <TT>t</TT> is less than the current
* simulation time.
* @exception NullPointerException
* (unchecked exception) Thrown if <TT>event</TT> is null.
*/
public final void doAt
(double t,
Event event)
{
sim.doAt (t, event);
}
/**
* Schedule the given event to be performed at a time <TT>dt</TT> in the
* future (at current simulation time + <TT>dt</TT>) in this event's
* simulation.
*
* @param dt Simulation time delta for <TT>event</TT>.
* @param event Event to be performed.
*
* @exception IllegalArgumentException
* (unchecked exception) Thrown if <TT>dt</TT> is less than zero.
* @exception NullPointerException
* (unchecked exception) Thrown if <TT>event</TT> is null.
*/
public final void doAfter
(double dt,
Event event)
{
sim.doAfter (dt, event);
}
/**
* Perform this event. Called by the {@linkplain Simulation} when the
* simulation time equals the time when this event is scheduled to take
* place.
*/
public abstract void perform();
}
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