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 */
31
32 import java.util.Date;
33 import java.util.Timer;
34 import java.util.TimerTask;
35 import java.util.concurrent.*;
36 import java.util.concurrent.atomic.AtomicInteger;
37
38 public class DelayOverflow
39 {
40 void scheduleNow(Timer timer, TimerTask task, int how) {
41 switch (how) {
42 case 0 :
43 timer.schedule(task, new Date(), Long.MAX_VALUE);
44 break;
45 case 1:
46 timer.schedule(task, 0L, Long.MAX_VALUE);
47 break;
48 case 2:
49 timer.scheduleAtFixedRate(task, new Date(), Long.MAX_VALUE);
50 break;
51 case 3:
52 timer.scheduleAtFixedRate(task, 0L, Long.MAX_VALUE);
53 break;
54 default:
55 fail(String.valueOf(how));
56 }
57 }
58
59 void sleep(long millis) {
60 try { Thread.sleep(millis); }
61 catch (Throwable t) { unexpected(t); }
62 }
63
64 /** Checks that scheduledExecutionTime returns a "recent" time. */
65 void checkScheduledExecutionTime(TimerTask task) {
66 long t = System.currentTimeMillis()
67 - task.scheduledExecutionTime();
68 check(t >= 0 && t < 1000 * 600);
69 }
70
71 void test(String[] args) throws Throwable {
72 for (int how=0; how<4; how++) {
73 final CountDownLatch done = new CountDownLatch(1);
74 final AtomicInteger count = new AtomicInteger(0);
75 final Timer timer = new Timer();
76 final TimerTask task = new TimerTask() {
77 @Override
78 public void run() {
79 checkScheduledExecutionTime(this);
80 count.incrementAndGet();
81 done.countDown();
82 }};
83
84 scheduleNow(timer, task, how);
85 done.await();
86 equal(count.get(), 1);
87 checkScheduledExecutionTime(task);
88 if (new java.util.Random().nextBoolean())
89 sleep(10);
90 check(task.cancel());
91 timer.cancel();
92 checkScheduledExecutionTime(task);
93 }
94 }
95
96 //--------------------- Infrastructure ---------------------------
97 volatile int passed = 0, failed = 0;
98 void pass() {passed++;}
99 void fail() {failed++; Thread.dumpStack();}
100 void fail(String msg) {System.err.println(msg); fail();}
101 void unexpected(Throwable t) {failed++; t.printStackTrace();}
102 void check(boolean cond) {if (cond) pass(); else fail();}
103 void equal(Object x, Object y) {
104 if (x == null ? y == null : x.equals(y)) pass();
105 else fail(x + " not equal to " + y);}
106 public static void main(String[] args) throws Throwable {
107 Class<?> k = new Object(){}.getClass().getEnclosingClass();
108 try {k.getMethod("instanceMain",String[].class)
109 .invoke( k.newInstance(), (Object) args);}
110 catch (Throwable e) {throw e.getCause();}}
111 public void instanceMain(String[] args) throws Throwable {
112 try {test(args);} catch (Throwable t) {unexpected(t);}
113 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
114 if (failed > 0) throw new AssertionError("Some tests failed");}
115 }