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Java > Open Source Codes > org > objectweb > proactive > ext > locationserver > util > MicroTimer


1 package org.objectweb.proactive.ext.locationserver.util;
2
3 public class MicroTimer {
4
5   static {
6     System.loadLibrary("Util_timer_MicroTimer");
7   }
8
9
10   private long[] cumulatedTime;
11   private long[] startTime;
12   private long[] endTime;
13
14
15   public native long[] currentTime();
16
17
18   public MicroTimer() {
19
20   }
21
22
23   public void start() {
24     this.startTime = currentTime();
25     this.endTime = currentTime();
26     this.cumulatedTime = new long[2];
27   }
28
29
30   /**
31    * Stop the timer and
32    * returns the cumulated time
33    */
34
35   public void stop() {
36     this.endTime = currentTime();
37     //this.cumulatedTime = this.updateCumulatedTime(startTime, endTime);
38 //return this.cumulatedTime;
39
40   }
41
42
43  // /**
44 // * Resume the Microtimer
45 // * Doesn't reset the cumulatedTime value
46 // */
47 // public void resume() {
48 // this.startTime = currentTime();
49 // }
50
51
52   /**
53    * Return the newly computed cumulated time
54    * as measured by this MicroTimer
55    * in microseconds
56    */
57   public long getCumulatedTime() {
58       long[] tmp = this.updateCumulatedTime(startTime, endTime); //this.stop();
59
60     // this.resume();
61 return tmp[0] * 1000000 + tmp[1];
62   }
63
64
65   protected long[] updateCumulatedTime(long[] t1, long[] t2) {
66       long[] tmp = new long[2]; // this.cumulatedTime;
67 tmp[0] = t2[0] - t1[0];
68     // System.out.println(" updateCumulatedTime: " + t1[0] + " " + t1[1]);
69 // System.out.println(" with updateCumulatedTime: " + t2[0] + " " + t2[1]);
70 if (t2[1] - t1[1] < 0) {
71       //one second has gone
72 tmp[0]--;
73       tmp[1] = t2[1] + 1000000 - t1[1];
74         
75       //tmp[1]+=t1[1]-t2[1];
76 //tmp[0]++;
77 } else {
78       tmp[1] += t2[1] - t1[1];
79     }
80     return tmp;
81   }
82
83
84   public static void main(String JavaDoc[] args) {
85     MicroTimer timer = new MicroTimer();
86     long[] startTime;
87     long[] endTime;
88     int i = 0;
89     timer.start();
90     while (i < 10) {
91       // try {
92 // Thread.sleep(500);
93 // } catch (Exception e) {e.printStackTrace();}
94 System.out.println("Time is " + timer.getCumulatedTime());
95       i++;
96     }
97     timer.stop();
98     System.out.println("Sleeping 1s");
99     try {
100       Thread.sleep(1000);
101     } catch (Exception JavaDoc e) {
102       e.printStackTrace();
103     }
104     i = 0;
105     // timer.resume();
106 while (i < 10) {
107     long startTime2=System.currentTimeMillis();
108     timer.start();
109     try {
110         Thread.sleep(500);
111     } catch (Exception JavaDoc e) {e.printStackTrace();}
112     timer.stop();
113     long endTimeMicro = timer.getCumulatedTime();
114     long endTime2=System.currentTimeMillis();
115       System.out.println("Time is " + endTimeMicro);
116       System.out.println("Time in ms is " + (endTime2-startTime2));
117       i++;
118     }
119   }
120 }
121
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