Main.java revision 2ad60cfc28e14ee8f0bb038720836a4696c478ad 
1// Copyright 2007 The Android Open Source Project
2
3/**
4 * Exercise Object.wait(), comparing results against wall clock time.
5 */
6public class Main {
7    /* delays, in milliseconds */
8    private final static long[] DELAYS = {
9        200, 500, 1000, 2000, 3500, 8000
10    };
11
12    public static void main(String[] args) {
13        boolean timing = (args.length >= 1) && args[0].equals("--timing");
14        doit(timing);
15    }
16
17    public static void doit(boolean timing) {
18        Object sleepy = new Object();
19        long start, end;
20
21        synchronized (sleepy) {
22            try {
23                sleepy.wait(-500);
24                System.out.println("HEY: didn't throw on negative arg");
25            } catch (IllegalArgumentException iae) {
26                System.out.println("Caught expected exception on neg arg");
27            } catch (InterruptedException ie) {
28                ie.printStackTrace();
29            }
30
31            for(long delay : DELAYS) {
32                System.out.println("Waiting for " + delay + "ms...");
33
34                start = System.currentTimeMillis();
35                try {
36                    sleepy.wait(delay);
37                } catch (InterruptedException ie) {
38                    ie.printStackTrace();
39                }
40                end = System.currentTimeMillis();
41
42                long elapsed = end - start;
43                boolean showTime = timing;
44
45                if (! timing) {
46                    long epsilon = delay / 10;
47                    if (epsilon > 50) {
48                        epsilon = 50;
49                    }
50
51                    long min = delay - epsilon;
52                    long max = delay + epsilon;
53
54                    if (elapsed < min) {
55                        System.out.println("  Elapsed time was too short");
56                        showTime = true;
57                    } else if (elapsed > max) {
58                        System.out.println("  Elapsed time was too long: "
59                            + "elapsed=" + elapsed + " max=" + max);
60                        showTime = true;
61                    }
62                }
63
64                if (showTime) {
65                    System.out.println("  Wall clock elapsed "
66                            + elapsed + "ms");
67                }
68            }
69        }
70    }
71}
72
73