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/*
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* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6431315
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* @summary ExecutorService.invokeAll might hang
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* @author Martin Buchholz
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*/
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import java.util.*;
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import java.util.concurrent.*;
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/**
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* Adapted from Doug Lea, which was...
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* adapted from a posting by Tom Sugden tom at epcc.ed.ac.uk
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*/
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public class BlockingTaskExecutor {
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static void realMain(String[] args) throws Throwable {
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for (int i = 1; i <= 100; i++) {
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System.out.print(".");
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test();
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}
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}
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static void test() throws Throwable {
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final ExecutorService executor = Executors.newCachedThreadPool();
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final NotificationReceiver notifiee1 = new NotificationReceiver();
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final NotificationReceiver notifiee2 = new NotificationReceiver();
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final Collection<Callable<Object>> tasks =
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new ArrayList<Callable<Object>>();
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tasks.add(new BlockingTask(notifiee1));
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tasks.add(new BlockingTask(notifiee2));
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tasks.add(new NonBlockingTask());
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// start a thread to invoke the tasks
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Thread thread = new Thread() { public void run() {
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try { executor.invokeAll(tasks); }
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catch (RejectedExecutionException t) {/* OK */}
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catch (Throwable t) { unexpected(t); }}};
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thread.start();
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// Wait until tasks begin execution
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notifiee1.waitForNotification();
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notifiee2.waitForNotification();
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// Now try to shutdown the executor service while tasks
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// are blocked. This should cause the tasks to be
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// interrupted.
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executor.shutdownNow();
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if (! executor.awaitTermination(5, TimeUnit.SECONDS))
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throw new Error("Executor stuck");
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// Wait for the invocation thread to complete.
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thread.join(1000);
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if (thread.isAlive()) {
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thread.interrupt();
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thread.join(1000);
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throw new Error("invokeAll stuck");
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}
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}
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/**
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* A helper class with a method to wait for a notification.
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*
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* The notification is received via the
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* {@code sendNotification} method.
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*/
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static class NotificationReceiver {
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/** Has the notifiee been notified? */
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boolean notified = false;
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/**
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* Notify the notification receiver.
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*/
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public synchronized void sendNotification() {
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notified = true;
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notifyAll();
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}
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/**
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* Waits until a notification has been received.
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*
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* @throws InterruptedException if the wait is interrupted
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*/
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public synchronized void waitForNotification()
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throws InterruptedException {
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while (! notified)
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wait();
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}
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}
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/**
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* A callable task that blocks until it is interrupted.
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* This task sends a notification to a notification receiver when
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* it is first called.
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*/
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static class BlockingTask implements Callable<Object> {
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private final NotificationReceiver notifiee;
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BlockingTask(NotificationReceiver notifiee) {
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this.notifiee = notifiee;
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}
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public Object call() throws InterruptedException {
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notifiee.sendNotification();
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// wait indefinitely until task is interrupted
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while (true) {
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synchronized (this) {
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wait();
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}
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}
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}
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}
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/**
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* A callable task that simply returns a string result.
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*/
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static class NonBlockingTask implements Callable<Object> {
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public Object call() {
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return "NonBlockingTaskResult";
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}
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}
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//--------------------- Infrastructure ---------------------------
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static volatile int passed = 0, failed = 0;
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static void pass() {passed++;}
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static void fail() {failed++; Thread.dumpStack();}
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static void fail(String msg) {System.out.println(msg); fail();}
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static void unexpected(Throwable t) {failed++; t.printStackTrace();}
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static void check(boolean cond) {if (cond) pass(); else fail();}
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static void equal(Object x, Object y) {
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if (x == null ? y == null : x.equals(y)) pass();
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else fail(x + " not equal to " + y);}
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public static void main(String[] args) throws Throwable {
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try {realMain(args);} catch (Throwable t) {unexpected(t);}
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
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if (failed > 0) throw new AssertionError("Some tests failed");}
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}
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