1/*
2 * Copyright (C) 2009 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.util.concurrent;
18
19import com.google.common.annotations.Beta;
20import com.google.common.collect.ForwardingObject;
21
22/**
23 * A {@link Service} that forwards all method calls to another service.
24 *
25 * @author Chris Nokleberg
26 * @since 1.0
27 */
28@Beta
29public abstract class ForwardingService extends ForwardingObject
30    implements Service {
31
32  /** Constructor for use by subclasses. */
33  protected ForwardingService() {}
34
35  @Override protected abstract Service delegate();
36
37  @Override public ListenableFuture<State> start() {
38    return delegate().start();
39  }
40
41  @Override public State state() {
42    return delegate().state();
43  }
44
45  @Override public ListenableFuture<State> stop() {
46    return delegate().stop();
47  }
48
49  @Override public State startAndWait() {
50    return delegate().startAndWait();
51  }
52
53  @Override public State stopAndWait() {
54    return delegate().stopAndWait();
55  }
56
57  @Override public boolean isRunning() {
58    return delegate().isRunning();
59  }
60
61  /**
62   * A sensible default implementation of {@link #startAndWait()}, in terms of
63   * {@link #start}. If you override {@link #start}, you may wish to override
64   * {@link #startAndWait()} to forward to this implementation.
65   * @since 9.0
66   */
67  protected State standardStartAndWait() {
68    return Futures.getUnchecked(start());
69  }
70
71  /**
72   * A sensible default implementation of {@link #stopAndWait()}, in terms of
73   * {@link #stop}. If you override {@link #stop}, you may wish to override
74   * {@link #stopAndWait()} to forward to this implementation.
75   * @since 9.0
76   */
77  protected State standardStopAndWait() {
78    return Futures.getUnchecked(stop());
79  }
80}
81