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GiraphTimerContext 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.metrics;
20  
21  import org.apache.giraph.time.SystemTime;
22  import org.apache.giraph.time.Time;
23  import org.apache.giraph.time.Times;
24  
25  import java.util.concurrent.TimeUnit;
26  
27  /**
28   * Context to use with GiraphTimer for timing an event.
29   */
30  public class GiraphTimerContext {
31    /** Object to use for time measurement */
32    private static Time TIME = SystemTime.get();
33  
34    /** GiraphTimer to callback to with result of timing */
35    private GiraphTimer giraphTimer;
36    /** Beginning time to compare against */
37    private long startTime;
38  
39    /**
40     * Create with GiraphTimer to callback to.
41     *
42     * @param giraphTimer GiraphTimer to use.
43     */
44    public GiraphTimerContext(GiraphTimer giraphTimer) {
45      this.giraphTimer = giraphTimer;
46      this.startTime = TIME.getNanoseconds();
47    }
48  
49    /**
50     * End timing. Set time elapsed in GiraphTimer.
51     */
52    public void stop() {
53      giraphTimer.set(Times.getNanosecondsSince(TIME, startTime),
54                      TimeUnit.NANOSECONDS);
55    }
56  }