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