1/*
2 * Copyright (C) 2008 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.testing;
18
19import com.google.common.annotations.Beta;
20import com.google.common.annotations.GwtCompatible;
21import com.google.common.base.Ticker;
22
23import java.util.concurrent.TimeUnit;
24import java.util.concurrent.atomic.AtomicLong;
25
26/**
27 * A Ticker whose value can be advanced programmatically in test.
28 * <p>
29 * This class is thread-safe.
30 *
31 * @author Jige Yu
32 * @since 10.0
33 */
34@Beta
35@GwtCompatible
36public class FakeTicker extends Ticker {
37
38  private final AtomicLong nanos = new AtomicLong();
39
40  /** Advances the ticker value by {@code time} in {@code timeUnit}. */
41  public FakeTicker advance(long time, TimeUnit timeUnit) {
42    return advance(timeUnit.toNanos(time));
43  }
44
45  /** Advances the ticker value by {@code nanoseconds}. */
46  public FakeTicker advance(long nanoseconds) {
47    nanos.addAndGet(nanoseconds);
48    return this;
49  }
50
51  @Override public long read() {
52    return nanos.get();
53  }
54}
55