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1   /**
2    *  Copyright 2003-2006 Greg Luck
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 net.sf.ehcache;
18  
19  /**
20   * @author Greg Luck
21   * @version $Id: StopWatch.java 28 2006-04-15 05:12:32Z gregluck $
22   * A stop watch that can be useful for instrumenting for performance
23   */
24  public class StopWatch {
25  
26      private static final String SUFFIX = "ms";
27                                           
28      /**
29       * Used for performance benchmarking
30       */
31      private long timeStamp = System.currentTimeMillis();
32  
33  
34      /**
35       * Gets the time elapsed between now and for the first time, the creation
36       * time of the class, and after that, between each call to this method
37       */
38      public long getElapsedTime() {
39          long now = System.currentTimeMillis();
40          long elapsed = now - timeStamp;
41          timeStamp = now;
42          return elapsed;
43      }
44  
45      /**
46       * @return formatted elapsed Time
47       */
48      public String getElapsedTimeString() {
49          return String.valueOf(getElapsedTime()) + SUFFIX;
50      }
51  
52  }
53  
54