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  * Copyright (C) 2011 The Guava Authors
  * 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.
import  javax.annotation.Nullable;

A callback for accepting the results of a java.util.concurrent.Future computation asynchronously.

To attach to a ListenableFuture use Futures.addCallback.

Anthony Zana
public interface FutureCallback<V> {
Invoked with the result of the Future computation when it is successful.
  void onSuccess(@Nullable V result);

Invoked when a Future computation fails or is canceled.

If the future's get method throws an ExecutionException, then the cause is passed to this method. Any other thrown object is passed unaltered.

  void onFailure(Throwable t);
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