J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 6362121 |
| 27 | * @summary Test one ScheduledThreadPoolExecutor extension scenario |
| 28 | * @author Martin Buchholz |
| 29 | */ |
| 30 | |
| 31 | // based on a test kindly provided by Holger Hoffstaette <holger@wizards.de> |
| 32 | |
| 33 | import java.util.concurrent.*; |
| 34 | import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 35 | |
| 36 | public class ScheduledTickleService { |
| 37 | |
| 38 | // We get intermittent ClassCastException if greater than 1 |
| 39 | // because of calls to compareTo |
| 40 | private final static int concurrency = 2; |
| 41 | |
| 42 | // Record when tasks are done |
| 43 | public final static CountDownLatch done = new CountDownLatch(concurrency); |
| 44 | |
| 45 | public static void realMain(String... args) throws InterruptedException { |
| 46 | // our tickle service |
| 47 | ScheduledExecutorService tickleService = |
| 48 | new ScheduledThreadPoolExecutor(concurrency) { |
| 49 | // We override decorateTask() to return a custom |
| 50 | // RunnableScheduledFuture which explicitly removes |
| 51 | // itself from the queue after cancellation. |
| 52 | protected <V> RunnableScheduledFuture<V> |
| 53 | decorateTask(Runnable runnable, |
| 54 | RunnableScheduledFuture<V> task) { |
| 55 | final ScheduledThreadPoolExecutor exec = this; |
| 56 | return new CustomRunnableScheduledFuture<V>(task) { |
| 57 | // delegate to wrapped task, except for: |
| 58 | public boolean cancel(boolean b) { |
| 59 | // cancel wrapped task & remove myself from the queue |
| 60 | return (task().cancel(b) |
| 61 | && exec.remove(this));}};}}; |
| 62 | |
| 63 | for (int i = 0; i < concurrency; i++) |
| 64 | new ScheduledTickle(i, tickleService) |
| 65 | .setUpdateInterval(25, MILLISECONDS); |
| 66 | |
| 67 | done.await(); |
| 68 | tickleService.shutdown(); |
| 69 | pass(); |
| 70 | } |
| 71 | |
| 72 | // our Runnable |
| 73 | static class ScheduledTickle implements Runnable { |
| 74 | public volatile int failures = 0; |
| 75 | |
| 76 | // my tickle service |
| 77 | private final ScheduledExecutorService service; |
| 78 | |
| 79 | // remember my own scheduled ticket |
| 80 | private ScheduledFuture ticket = null; |
| 81 | |
| 82 | // remember the number of times I've been tickled |
| 83 | private int numTickled = 0; |
| 84 | |
| 85 | // my private name |
| 86 | private final String name; |
| 87 | |
| 88 | public ScheduledTickle(int i, ScheduledExecutorService service) { |
| 89 | super(); |
| 90 | this.name = "Tickler-"+i; |
| 91 | this.service = service; |
| 92 | } |
| 93 | |
| 94 | // set my tickle interval; 0 to disable further tickling. |
| 95 | public synchronized void setUpdateInterval(long interval, |
| 96 | TimeUnit unit) { |
| 97 | // cancel & remove previously created ticket |
| 98 | if (ticket != null) { |
| 99 | ticket.cancel(false); |
| 100 | ticket = null; |
| 101 | } |
| 102 | |
| 103 | if (interval > 0 && ! service.isShutdown()) { |
| 104 | // requeue with new interval |
| 105 | ticket = service.scheduleAtFixedRate(this, interval, |
| 106 | interval, unit); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | public synchronized void run() { |
| 111 | try { |
| 112 | check(numTickled < 6); |
| 113 | numTickled++; |
| 114 | System.out.println(name + ": Run " + numTickled); |
| 115 | |
| 116 | // tickle 3 times and then slow down |
| 117 | if (numTickled == 3) { |
| 118 | System.out.println(name + ": slower please!"); |
| 119 | this.setUpdateInterval(100, MILLISECONDS); |
| 120 | } |
| 121 | // ..but only 5 times max. |
| 122 | else if (numTickled == 5) { |
| 123 | System.out.println(name + ": OK that's enough."); |
| 124 | this.setUpdateInterval(0, MILLISECONDS); |
| 125 | ScheduledTickleService.done.countDown(); |
| 126 | } |
| 127 | } catch (Throwable t) { unexpected(t); } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | // This is just a generic wrapper to make up for the private ScheduledFutureTask |
| 132 | static class CustomRunnableScheduledFuture<V> |
| 133 | implements RunnableScheduledFuture<V> { |
| 134 | // the wrapped future |
| 135 | private RunnableScheduledFuture<V> task; |
| 136 | |
| 137 | public CustomRunnableScheduledFuture(RunnableScheduledFuture<V> task) { |
| 138 | super(); |
| 139 | this.task = task; |
| 140 | } |
| 141 | |
| 142 | public RunnableScheduledFuture<V> task() { return task; } |
| 143 | |
| 144 | // Forwarding methods |
| 145 | public boolean isPeriodic() { return task.isPeriodic(); } |
| 146 | public boolean isCancelled() { return task.isCancelled(); } |
| 147 | public boolean isDone() { return task.isDone(); } |
| 148 | public boolean cancel(boolean b) { return task.cancel(b); } |
| 149 | public long getDelay(TimeUnit unit) { return task.getDelay(unit); } |
| 150 | public void run() { task.run(); } |
| 151 | |
| 152 | public V get() |
| 153 | throws InterruptedException, ExecutionException { |
| 154 | return task.get(); |
| 155 | } |
| 156 | |
| 157 | public V get(long timeout, TimeUnit unit) |
| 158 | throws InterruptedException, ExecutionException, TimeoutException { |
| 159 | return task.get(timeout, unit); |
| 160 | } |
| 161 | |
| 162 | public int compareTo(Delayed other) { |
| 163 | if (this == other) |
| 164 | return 0; |
| 165 | else if (other instanceof CustomRunnableScheduledFuture) |
| 166 | return task.compareTo(((CustomRunnableScheduledFuture)other).task()); |
| 167 | else |
| 168 | return task.compareTo(other); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | //--------------------- Infrastructure --------------------------- |
| 173 | static volatile int passed = 0, failed = 0; |
| 174 | static void pass() {passed++;} |
| 175 | static void fail() {failed++; Thread.dumpStack();} |
| 176 | static void fail(String msg) {System.out.println(msg); fail();} |
| 177 | static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| 178 | static void check(boolean cond) {if (cond) pass(); else fail();} |
| 179 | static void equal(Object x, Object y) { |
| 180 | if (x == null ? y == null : x.equals(y)) pass(); |
| 181 | else fail(x + " not equal to " + y);} |
| 182 | public static void main(String[] args) throws Throwable { |
| 183 | try {realMain(args);} catch (Throwable t) {unexpected(t);} |
| 184 | System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| 185 | if (failed > 0) throw new AssertionError("Some tests failed");} |
| 186 | } |