Callback.java

/*
   Copyright (c) 2012 LinkedIn Corp.

   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.
*/

/* $Id$ */
package com.linkedin.common.callback;

/**
 * A callback provides a means for the user to get notification when an asynchronous
 * operation has completed.
 *
 * @author Chris Pettitt
 * @version $Revision$
 */
public interface Callback<T> extends SuccessCallback<T>
{
  /**
   * Called if the asynchronous operation failed with an error.
   *
   * TODO: Should we take Throwable instead of Exception?
   *
   * @param e the error
   */
  void onError(Throwable e);
}