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
017 package com.google.common.util.concurrent;
018
019 import 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 */
030 public 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 }