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 package test.java.util.Timer;
34 
35 import java.util.Date;
36 import java.util.Timer;
37 import java.util.TimerTask;
38 import java.util.concurrent.*;
39 import java.util.concurrent.atomic.AtomicInteger;
40 
41 public class DelayOverflow
42 {
scheduleNow(Timer timer, TimerTask task, int how)43     void scheduleNow(Timer timer, TimerTask task, int how) {
44         switch (how) {
45             case 0 :
46                 timer.schedule(task, new Date(), Long.MAX_VALUE);
47                 break;
48             case 1:
49                 timer.schedule(task, 0L, Long.MAX_VALUE);
50                 break;
51             case 2:
52                 timer.scheduleAtFixedRate(task, new Date(), Long.MAX_VALUE);
53                 break;
54             case 3:
55                 timer.scheduleAtFixedRate(task, 0L, Long.MAX_VALUE);
56                 break;
57             default:
58                 fail(String.valueOf(how));
59         }
60     }
61 
sleep(long millis)62     void sleep(long millis) {
63         try { Thread.sleep(millis); }
64         catch (Throwable t) { unexpected(t); }
65     }
66 
67     /** Checks that scheduledExecutionTime returns a "recent" time. */
checkScheduledExecutionTime(TimerTask task)68     void checkScheduledExecutionTime(TimerTask task) {
69         long t = System.currentTimeMillis()
70             - task.scheduledExecutionTime();
71         check(t >= 0 && t < 1000 * 600);
72     }
73 
test(String[] args)74     void test(String[] args) throws Throwable {
75         for (int how=0; how<4; how++) {
76             final CountDownLatch done = new CountDownLatch(1);
77             final AtomicInteger count = new AtomicInteger(0);
78             final Timer timer = new Timer();
79             final TimerTask task = new TimerTask() {
80                 @Override
81                 public void run() {
82                     checkScheduledExecutionTime(this);
83                     count.incrementAndGet();
84                     done.countDown();
85                 }};
86 
87             scheduleNow(timer, task, how);
88             done.await();
89             equal(count.get(), 1);
90             checkScheduledExecutionTime(task);
91             if (new java.util.Random().nextBoolean())
92                 sleep(10);
93             check(task.cancel());
94             timer.cancel();
95             checkScheduledExecutionTime(task);
96         }
97     }
98 
99     //--------------------- Infrastructure ---------------------------
100     volatile int passed = 0, failed = 0;
pass()101     void pass() {passed++;}
fail()102     void fail() {failed++; Thread.dumpStack();}
fail(String msg)103     void fail(String msg) {System.err.println(msg); fail();}
unexpected(Throwable t)104     void unexpected(Throwable t) {failed++; t.printStackTrace();}
check(boolean cond)105     void check(boolean cond) {if (cond) pass(); else fail();}
equal(Object x, Object y)106     void equal(Object x, Object y) {
107         if (x == null ? y == null : x.equals(y)) pass();
108         else fail(x + " not equal to " + y);}
main(String[] args)109     public static void main(String[] args) throws Throwable {
110         Class<?> k = new Object(){}.getClass().getEnclosingClass();
111         try {k.getMethod("instanceMain",String[].class)
112                 .invoke( k.newInstance(), (Object) args);}
113         catch (Throwable e) {throw e.getCause();}}
instanceMain(String[] args)114     public void instanceMain(String[] args) throws Throwable {
115         try {test(args);} catch (Throwable t) {unexpected(t);}
116         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
117         if (failed > 0) throw new AssertionError("Some tests failed");}
118 }
119