| /* |
| * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 6362121 |
| * @summary Test one ScheduledThreadPoolExecutor extension scenario |
| * @author Martin Buchholz |
| */ |
| |
| // based on a test kindly provided by Holger Hoffstaette <holger@wizards.de> |
| |
| import java.util.concurrent.*; |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| public class ScheduledTickleService { |
| |
| // We get intermittent ClassCastException if greater than 1 |
| // because of calls to compareTo |
| private final static int concurrency = 2; |
| |
| // Record when tasks are done |
| public final static CountDownLatch done = new CountDownLatch(concurrency); |
| |
| public static void realMain(String... args) throws InterruptedException { |
| // our tickle service |
| ScheduledExecutorService tickleService = |
| new ScheduledThreadPoolExecutor(concurrency) { |
| // We override decorateTask() to return a custom |
| // RunnableScheduledFuture which explicitly removes |
| // itself from the queue after cancellation. |
| protected <V> RunnableScheduledFuture<V> |
| decorateTask(Runnable runnable, |
| RunnableScheduledFuture<V> task) { |
| final ScheduledThreadPoolExecutor exec = this; |
| return new CustomRunnableScheduledFuture<V>(task) { |
| // delegate to wrapped task, except for: |
| public boolean cancel(boolean b) { |
| // cancel wrapped task & remove myself from the queue |
| return (task().cancel(b) |
| && exec.remove(this));}};}}; |
| |
| for (int i = 0; i < concurrency; i++) |
| new ScheduledTickle(i, tickleService) |
| .setUpdateInterval(25, MILLISECONDS); |
| |
| done.await(); |
| tickleService.shutdown(); |
| pass(); |
| } |
| |
| // our Runnable |
| static class ScheduledTickle implements Runnable { |
| public volatile int failures = 0; |
| |
| // my tickle service |
| private final ScheduledExecutorService service; |
| |
| // remember my own scheduled ticket |
| private ScheduledFuture ticket = null; |
| |
| // remember the number of times I've been tickled |
| private int numTickled = 0; |
| |
| // my private name |
| private final String name; |
| |
| public ScheduledTickle(int i, ScheduledExecutorService service) { |
| super(); |
| this.name = "Tickler-"+i; |
| this.service = service; |
| } |
| |
| // set my tickle interval; 0 to disable further tickling. |
| public synchronized void setUpdateInterval(long interval, |
| TimeUnit unit) { |
| // cancel & remove previously created ticket |
| if (ticket != null) { |
| ticket.cancel(false); |
| ticket = null; |
| } |
| |
| if (interval > 0 && ! service.isShutdown()) { |
| // requeue with new interval |
| ticket = service.scheduleAtFixedRate(this, interval, |
| interval, unit); |
| } |
| } |
| |
| public synchronized void run() { |
| try { |
| check(numTickled < 6); |
| numTickled++; |
| System.out.println(name + ": Run " + numTickled); |
| |
| // tickle 3 times and then slow down |
| if (numTickled == 3) { |
| System.out.println(name + ": slower please!"); |
| this.setUpdateInterval(100, MILLISECONDS); |
| } |
| // ..but only 5 times max. |
| else if (numTickled == 5) { |
| System.out.println(name + ": OK that's enough."); |
| this.setUpdateInterval(0, MILLISECONDS); |
| ScheduledTickleService.done.countDown(); |
| } |
| } catch (Throwable t) { unexpected(t); } |
| } |
| } |
| |
| // This is just a generic wrapper to make up for the private ScheduledFutureTask |
| static class CustomRunnableScheduledFuture<V> |
| implements RunnableScheduledFuture<V> { |
| // the wrapped future |
| private RunnableScheduledFuture<V> task; |
| |
| public CustomRunnableScheduledFuture(RunnableScheduledFuture<V> task) { |
| super(); |
| this.task = task; |
| } |
| |
| public RunnableScheduledFuture<V> task() { return task; } |
| |
| // Forwarding methods |
| public boolean isPeriodic() { return task.isPeriodic(); } |
| public boolean isCancelled() { return task.isCancelled(); } |
| public boolean isDone() { return task.isDone(); } |
| public boolean cancel(boolean b) { return task.cancel(b); } |
| public long getDelay(TimeUnit unit) { return task.getDelay(unit); } |
| public void run() { task.run(); } |
| |
| public V get() |
| throws InterruptedException, ExecutionException { |
| return task.get(); |
| } |
| |
| public V get(long timeout, TimeUnit unit) |
| throws InterruptedException, ExecutionException, TimeoutException { |
| return task.get(timeout, unit); |
| } |
| |
| public int compareTo(Delayed other) { |
| if (this == other) |
| return 0; |
| else if (other instanceof CustomRunnableScheduledFuture) |
| return task.compareTo(((CustomRunnableScheduledFuture)other).task()); |
| else |
| return task.compareTo(other); |
| } |
| } |
| |
| //--------------------- Infrastructure --------------------------- |
| static volatile int passed = 0, failed = 0; |
| static void pass() {passed++;} |
| static void fail() {failed++; Thread.dumpStack();} |
| static void fail(String msg) {System.out.println(msg); fail();} |
| static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| static void check(boolean cond) {if (cond) pass(); else fail();} |
| static void equal(Object x, Object y) { |
| if (x == null ? y == null : x.equals(y)) pass(); |
| else fail(x + " not equal to " + y);} |
| public static void main(String[] args) throws Throwable { |
| try {realMain(args);} catch (Throwable t) {unexpected(t);} |
| System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| if (failed > 0) throw new AssertionError("Some tests failed");} |
| } |