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FakeTime xref
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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.giraph.time;
20  
21  import java.util.Date;
22  import java.util.concurrent.atomic.AtomicLong;
23  
24  /**
25   * Thread-safe implementation of Time for testing that can help get time based
26   * ordering of events when desired.
27   */
28  public class FakeTime implements Time {
29    /** Nanoseconds from the fake epoch */
30    private final AtomicLong nanosecondsSinceEpoch = new AtomicLong();
31  
32    @Override
33    public long getMilliseconds() {
34      return nanosecondsSinceEpoch.get() / NS_PER_MS;
35    }
36  
37    @Override
38    public long getMicroseconds() {
39      return nanosecondsSinceEpoch.get() / NS_PER_US;
40    }
41  
42    @Override
43    public long getNanoseconds() {
44      return nanosecondsSinceEpoch.get();
45    }
46  
47    @Override
48    public int getSeconds() {
49      return (int) (nanosecondsSinceEpoch.get() / NS_PER_SECOND);
50    }
51  
52    @Override
53    public Date getCurrentDate() {
54      return new Date(getMilliseconds());
55    }
56  
57    @Override
58    public void sleep(long milliseconds) throws InterruptedException {
59      nanosecondsSinceEpoch.getAndAdd(milliseconds * NS_PER_MS);
60    }
61  }