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TriggerQueue.java
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143 lines (120 loc) · 3.95 KB
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/*
* Copyright 1990-2008, Mark Little, University of Newcastle upon Tyne
* and others contributors as indicated
* by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 1990-2008,
*/
package org.javasim;
import java.util.LinkedList;
import java.util.NoSuchElementException;
/**
* A TriggerQueue is used to hold simulation process instances.
*/
public class TriggerQueue
{
/**
* Create a new instance.
*/
public TriggerQueue()
{
head = new LinkedList<SimulationEntity>();
}
/**
* If there is anything left on the queue when this goes out-of-scope then
* we will place them back on to the simulation queue, rather than doing
* nothing - this is the safest thing to do. THIS SHOULD NOT HAPPEN THOUGH!*
*/
public void finalize ()
{
if (head != null)
{
if (head.size() > 0)
{
System.out
.println("TriggerQueue destructor called with non-zero list!");
try
{
triggerAll();
}
catch (NoSuchElementException e)
{
}
}
}
}
/**
* Remove the first entry from the queue, possibly trigger it and then reactivate it
* at the current simulation time.
*
* @param setTrigger indicate whether or not to also trigger the removed process.
* @throws NoSuchElementException thrown if the queue is empty.
*/
public synchronized void triggerFirst (boolean setTrigger)
throws NoSuchElementException
{
if (head.size() == 0)
throw new NoSuchElementException();
SimulationEntity removed = this.remove();
if (setTrigger)
removed.trigger();
try
{
removed.reactivateAt(SimulationProcess.currentTime());
}
catch (RestartException e)
{
}
catch (SimulationException e)
{
}
}
/**
* Remove the first instance from the queue, trigger it and activate it at
* the current time.
*
* @throws NoSuchElementException thrown if the queue is empty.
*/
public synchronized void triggerFirst () throws NoSuchElementException
{
triggerFirst(true);
}
/**
* Remove all simulation processes from the queue and trigger them.
*
* @throws NoSuchElementException thrown if the queue is empty.
*/
public synchronized void triggerAll () throws NoSuchElementException
{
long currentNumber = head.size();
if (currentNumber == 0)
throw new NoSuchElementException();
for (int i = 0; i < currentNumber; i++)
triggerFirst();
}
protected synchronized void insert (SimulationEntity toAdd)
throws SimulationException
{
if (toAdd.isWaiting())
throw new SimulationException("Entity already waiting on event.");
head.add(toAdd);
}
protected synchronized SimulationEntity remove ()
throws NoSuchElementException
{
return head.removeFirst();
}
private LinkedList<SimulationEntity> head;
}