/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.epl.variable;
/**
* A callback interface for indicating a change in variable value.
*/
public interface VariableChangeCallback
{
/**
* Indicate a change in variable value.
* @param newValue new value
* @param oldValue old value
*/
public void update(Object newValue, Object oldValue);
}