VariableChangeCallback.java

/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  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);
}