1 /*
2 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @bug 6730507
27 * @summary java.util.Timer schedule delay Long.MAX_VALUE causes task to execute multiple times
28 * @author Chris Hegarty
29 * @author Martin Buchholz
30 * @key randomness
31 */
32
33 import java.util.Date;
34 import java.util.Timer;
35 import java.util.TimerTask;
36 import java.util.concurrent.*;
37 import java.util.concurrent.atomic.AtomicInteger;
38
39 public class DelayOverflow
40 {
41 void scheduleNow(Timer timer, TimerTask task, int how) {
42 switch (how) {
43 case 0 :
44 timer.schedule(task, new Date(), Long.MAX_VALUE);
45 break;
46 case 1:
47 timer.schedule(task, 0L, Long.MAX_VALUE);
48 break;
49 case 2:
50 timer.scheduleAtFixedRate(task, new Date(), Long.MAX_VALUE);
51 break;
52 case 3:
53 timer.scheduleAtFixedRate(task, 0L, Long.MAX_VALUE);
54 break;
55 default:
56 fail(String.valueOf(how));
57 }
58 }
59
60 void sleep(long millis) {
61 try { Thread.sleep(millis); }
62 catch (Throwable t) { unexpected(t); }
63 }
64
65 /** Checks that scheduledExecutionTime returns a "recent" time. */
66 void checkScheduledExecutionTime(TimerTask task) {
67 long t = System.currentTimeMillis()
68 - task.scheduledExecutionTime();
69 check(t >= 0 && t < 1000 * 600);
70 }
71
72 void test(String[] args) throws Throwable {
73 for (int how=0; how<4; how++) {
74 final CountDownLatch done = new CountDownLatch(1);
75 final AtomicInteger count = new AtomicInteger(0);
76 final Timer timer = new Timer();
77 final TimerTask task = new TimerTask() {
78 @Override
79 public void run() {
80 checkScheduledExecutionTime(this);
81 count.incrementAndGet();
82 done.countDown();
83 }};
84
85 scheduleNow(timer, task, how);
86 done.await();
87 equal(count.get(), 1);
88 checkScheduledExecutionTime(task);
89 if (new java.util.Random().nextBoolean())
90 sleep(10);
91 check(task.cancel());
92 timer.cancel();
93 checkScheduledExecutionTime(task);
94 }
95 }
96
97 //--------------------- Infrastructure ---------------------------
98 volatile int passed = 0, failed = 0;
99 void pass() {passed++;}
100 void fail() {failed++; Thread.dumpStack();}
101 void fail(String msg) {System.err.println(msg); fail();}
102 void unexpected(Throwable t) {failed++; t.printStackTrace();}
103 void check(boolean cond) {if (cond) pass(); else fail();}
104 void equal(Object x, Object y) {
105 if (x == null ? y == null : x.equals(y)) pass();
106 else fail(x + " not equal to " + y);}
107 public static void main(String[] args) throws Throwable {
108 Class<?> k = new Object(){}.getClass().getEnclosingClass();
109 try {k.getMethod("instanceMain",String[].class)
110 .invoke( k.newInstance(), (Object) args);}
111 catch (Throwable e) {throw e.getCause();}}
112 public void instanceMain(String[] args) throws Throwable {
113 try {test(args);} catch (Throwable t) {unexpected(t);}
114 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
115 if (failed > 0) throw new AssertionError("Some tests failed");}
116 }