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The Drools and jBPM public API which is backwards compatible between releases.

There is a newer version: 6.5.0.Final

/*
 * Copyright 2005 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.event.process;

/**
 * An event when a variable inside a process instance has been changed. 
 */
public interface ProcessVariableChangedEvent
    extends
    ProcessEvent {

	/**
	 * The unique id of the process variable (definition).
	 * 
	 * @return the variable id
	 */
    String getVariableId();

    /**
     * The unique id of the process variable instance (as multiple node instances with the
     * same process variable definition exists).  This is an aggregation of the unique id of
     * the instance that contains the variable scope and the variable id.
     *  
     * @return the variable instance id
     */
    String getVariableInstanceId();

    /**
     * The old value of the variable.
     * This may be null.
     * 
     * @return the old value
     */
    Object getOldValue();

    /**
     * The new value of the variable.
     * This may be null.
     * 
     * @return the new value
     */
    Object getNewValue();

}