/*
* 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
*
* 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.common.util.concurrent;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import javax.annotation.Nullable;
/**
* A callback for accepting the results of a {@link java.util.concurrent.Future}
* computation asynchronously.
*
* <p>To attach to a {@link ListenableFuture} use {@link Futures#addCallback}.
*
* @author Anthony Zana
* @since 10.0
*/
public interface FutureCallback<V> {
/**
* Invoked with the result of the {@code Future} computation when it is
* successful.
*/
void onSuccess(@Nullable V result);
/**
* Invoked when a {@code Future} computation fails or is canceled.
*
* <p>If the future's {@link Future#get() get} method throws an {@link
* ExecutionException}, then the cause is passed to this method. Any other
* thrown object is passed unaltered.
*/
void onFailure(Throwable t);
}