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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
 *
 * 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.
 *
 * To attach to a {@link ListenableFuture} use {@link Futures#addCallback}.
 *
 * @author Anthony Zana
 * @since 10.0
 */
public interface FutureCallback {
  /**
   * 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.
   *
   * 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);
}