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Java > Open Source Codes > com > google > inject > util > Stopwatch


1 /**
2  * Copyright (C) 2006 Google Inc.
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
17 package com.google.inject.util;
18
19 import java.util.logging.Logger JavaDoc;
20
21 /**
22  * Enables simple performance monitoring.
23  *
24  * @author crazybob@google.com (Bob Lee)
25  */
26 public class Stopwatch {
27
28   long start = System.currentTimeMillis();
29
30   /**
31    * Resets and returns elapsed time in milliseconds.
32    */
33   public long reset() {
34     long now = System.currentTimeMillis();
35     try {
36       return now - start;
37     } finally {
38       start = now;
39     }
40   }
41
42   /**
43    * Resets and logs elapsed time in milliseconds.
44    */
45   public void resetAndLog(Logger JavaDoc logger, String JavaDoc label) {
46     logger.fine(label + ": " + reset() + "ms");
47   }
48 }
49
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