undoableactionhandler.java

一个java工作流引擎

package org.jbpm.delegation;

/**
 * is an ActionHandler that allows to perform compensating actions when a user
 * undoes a process instance.
 *
 * <p>When a process instance is undone, all variable updates will be undone
 * automatically.  When the execute method of an ActionHandler sets the value
 * of a variable, this will be done automatic after the engine calls the undo
 * method.</p>  
 */
public interface UndoableActionHandler extends ActionHandler {
  
  /**
   * performs the compensating transaction for the execute method from the ActionHandler.
   */
  void undo( ExecutionContext executionContext );
}