1 cananian 1.1.2.2 // Timer.java, created Tue Jan 23 16:09:55 2001 by wbeebee
2 wbeebee 1.1.2.1 // Copyright (C) 2001 Wes Beebee <wbeebee@mit.edu>
3 wbeebee 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 wbeebee 1.1.2.1 package harpoon.Util;
5 wbeebee 1.1.2.1
6 wbeebee 1.1.2.1 /**
7 wbeebee 1.1.2.1 * <code>Timer</code> keeps track of how much time accumulates between
8 wbeebee 1.1.2.1 * successive calls to start and stop. This is useful when profiling the
9 wbeebee 1.1.2.1 * compiler.
10 wbeebee 1.1.2.1 *
11 wbeebee 1.1.2.1 * <code>Timer t = new Timer();
12 wbeebee 1.1.2.1 *
13 wbeebee 1.1.2.1 * for (int i=0; i<10; i++) {
14 wbeebee 1.1.2.1 * bar();
15 wbeebee 1.1.2.1 * t.start();
16 wbeebee 1.1.2.1 * foo();
17 wbeebee 1.1.2.1 * t.stop();
18 wbeebee 1.1.2.1 * }
19 wbeebee 1.1.2.1 *
20 wbeebee 1.1.2.1 * System.out.println(t.timeElapsed());</code>
21 wbeebee 1.1.2.1 *
22 wbeebee 1.1.2.1 * This prints the total time spent in foo in milliseconds.
23 wbeebee 1.1.2.1 */
24 wbeebee 1.1.2.1
25 wbeebee 1.1.2.1 public class Timer {
26 wbeebee 1.1.2.1 private long timeElapsed, timerStart;
27 wbeebee 1.1.2.1
28 wbeebee 1.1.2.1 /** Create a new Timer and initialize timeElapsed to 0. */
29 wbeebee 1.1.2.1
30 wbeebee 1.1.2.1 public Timer() {
31 wbeebee 1.1.2.1 timeElapsed = 0;
32 wbeebee 1.1.2.1 timerStart = -1;
33 wbeebee 1.1.2.1 }
34 wbeebee 1.1.2.1
35 wbeebee 1.1.2.1 /** Ask if the timer is currently running. */
36 wbeebee 1.1.2.1
37 wbeebee 1.1.2.1 public boolean running() {
38 wbeebee 1.1.2.1 return timerStart != -1;
39 wbeebee 1.1.2.1 }
40 wbeebee 1.1.2.1
41 wbeebee 1.1.2.1 /** Start the timer running. */
42 wbeebee 1.1.2.1
43 wbeebee 1.1.2.1 public void start() {
44 cananian 1.3.2.1 assert timerStart == -1 : "Two Timer.start() without Timer.stop()";
45 wbeebee 1.1.2.1 timerStart = System.currentTimeMillis();
46 wbeebee 1.1.2.1 }
47 wbeebee 1.1.2.1
48 wbeebee 1.1.2.1 /** Stop the timer. */
49 wbeebee 1.1.2.1
50 wbeebee 1.1.2.1 public void stop() {
51 wbeebee 1.1.2.1 timeElapsed += System.currentTimeMillis() - timerStart;
52 cananian 1.3.2.1 assert timerStart != -1 : "Two Timer.stop() without Timer.start()";
53 wbeebee 1.1.2.1 timerStart = -1;
54 wbeebee 1.1.2.1 }
55 wbeebee 1.1.2.1
56 wbeebee 1.1.2.1 /** Return the cumulative amount of time elapsed between starts and stops
57 wbeebee 1.1.2.1 * in milliseconds.
58 wbeebee 1.1.2.1 */
59 wbeebee 1.1.2.1
60 wbeebee 1.1.2.1 public long timeElapsed() {
61 wbeebee 1.1.2.1 return timeElapsed;
62 wbeebee 1.1.2.1 }
63 wbeebee 1.1.2.1
64 wbeebee 1.1.2.1 /** Return a string representing the current state of the timer. */
65 wbeebee 1.1.2.1
66 wbeebee 1.1.2.1 public String toString() {
67 wbeebee 1.1.2.1 StringBuffer sb = new StringBuffer("Timer ");
68 wbeebee 1.1.2.1 if (timerStart != -1) {
69 wbeebee 1.1.2.1 sb.append("running: ");
70 wbeebee 1.1.2.1 sb.append(((System.currentTimeMillis() -
71 wbeebee 1.1.2.1 timerStart + timeElapsed) / 1000.0));
72 salcianu 1.5 sb.append(" s elapsed.");
73 wbeebee 1.1.2.1 } else {
74 wbeebee 1.1.2.1 sb.append("stopped: ");
75 wbeebee 1.1.2.1 sb.append(timeElapsed / 1000.0);
76 salcianu 1.5 sb.append(" s elapsed.");
77 wbeebee 1.1.2.1 }
78 wbeebee 1.1.2.1 return sb.toString();
79 wbeebee 1.1.2.1 }
80 cananian 1.2 }