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/*
 * Copyright 2011 Google 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 com.google.gwt.core.client;

/**
 * A callback for any asynchronous call that can result in success or failure.
 * 
 * @param  The type returned on success
 * @param  The type returned on failure
 */
public interface Callback {

  /**
   * Called when an asynchronous call fails to complete normally.
   * 
   * @param reason failure encountered
   */
  void onFailure(F reason);

  /**
   * Called when an asynchronous call completes successfully.
   * 
   * @param result the value returned
   */
  void onSuccess(T result);
}




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