1/*
2 * Copyright (C) 2013 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 */
16package com.google.common.util.concurrent;
17
18import java.util.concurrent.Callable;
19import java.util.concurrent.ScheduledExecutorService;
20import java.util.concurrent.ScheduledFuture;
21import java.util.concurrent.TimeUnit;
22
23/**
24 * An abstract {@code ScheduledExecutorService} that allows subclasses to
25 * {@linkplain #wrapTask(Callable) wrap} tasks before they are submitted to the underlying executor.
26 *
27 * <p>Note that task wrapping may occur even if the task is never executed.
28 *
29 * @author Luke Sandberg
30 */
31abstract class WrappingScheduledExecutorService extends WrappingExecutorService
32    implements ScheduledExecutorService {
33  final ScheduledExecutorService delegate;
34
35  protected WrappingScheduledExecutorService(ScheduledExecutorService delegate) {
36    super(delegate);
37    this.delegate = delegate;
38  }
39
40  @Override
41  public final ScheduledFuture<?> schedule(Runnable command, long delay, TimeUnit unit) {
42    return delegate.schedule(wrapTask(command), delay, unit);
43  }
44
45  @Override
46  public final <V> ScheduledFuture<V> schedule(Callable<V> task, long delay, TimeUnit unit) {
47    return delegate.schedule(wrapTask(task), delay, unit);
48  }
49
50  @Override
51  public final ScheduledFuture<?> scheduleAtFixedRate(
52      Runnable command, long initialDelay, long period, TimeUnit unit) {
53    return delegate.scheduleAtFixedRate(wrapTask(command), initialDelay, period, unit);
54  }
55
56  @Override
57  public final ScheduledFuture<?> scheduleWithFixedDelay(
58      Runnable command, long initialDelay, long delay, TimeUnit unit) {
59    return delegate.scheduleWithFixedDelay(wrapTask(command), initialDelay, delay, unit);
60  }
61}
62