001/*
002 * Copyright (C) 2011 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.util.concurrent;
018
019import java.util.concurrent.Callable;
020
021/**
022 * A listening executor service which forwards all its method calls to another
023 * listening executor service. Subclasses should override one or more methods to
024 * modify the behavior of the backing executor service as desired per the <a
025 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
026 *
027 * @author Isaac Shum
028 * @since 10.0
029 */
030public abstract class ForwardingListeningExecutorService
031    extends ForwardingExecutorService implements ListeningExecutorService {
032  /** Constructor for use by subclasses. */
033  protected ForwardingListeningExecutorService() {}
034
035  @Override
036  protected abstract ListeningExecutorService delegate();
037
038  @Override
039  public <T> ListenableFuture<T> submit(Callable<T> task) {
040    return delegate().submit(task);
041  }
042
043  @Override
044  public ListenableFuture<?> submit(Runnable task) {
045    return delegate().submit(task);
046  }
047
048  @Override
049  public <T> ListenableFuture<T> submit(Runnable task, T result) {
050    return delegate().submit(task, result);
051  }
052}