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  * Copyright 2011 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.jbpm.formbuilder.client.bus;
Handler to both define undo/redo actions and register an undo / redo event
public interface UndoableHandler extends EventHandler {

When event happens (to register it on the queue)
    void onEvent(UndoableEvent event);

Action done to Undo this action
    void undoAction(UndoableEvent event);
Action done to Do (and Redo) this action
    void doAction(UndoableEvent event);
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