Java example source code file (ThrowingRunnable.java)

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Java - Java tags/keywords

assertionerror, object, override, phaser, runtimeexception, some, string, this, threading, threads, throwable, throwingrunnable, uncaughtexceptionhandler

The ThrowingRunnable.java Java example source code

/*
 * 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.
 */

/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

/*
 * @test
 * @bug 8008378
 * @run main/othervm -Djava.util.concurrent.ForkJoinPool.common.exceptionHandler=ThrowingRunnable
 *                   ThrowingRunnable
 * @summary FJP.execute(Runnable), uncaught exception should cause worker thread
 *          to die.
 * @author Chris Hegarty
 */

import java.lang.Thread.UncaughtExceptionHandler;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.Phaser;
import java.util.concurrent.TimeUnit;

public class ThrowingRunnable implements Runnable, UncaughtExceptionHandler {

    static final Phaser phaser = new Phaser(2);

    private static void realMain(String[] args) throws Throwable {
        ThrowingRunnable r = new ThrowingRunnable();
        ForkJoinPool.commonPool().execute(r);
        phaser.awaitAdvanceInterruptibly(phaser.arrive(), 10, TimeUnit.SECONDS);
        pass();
    }

    @Override
    public void run() {
        throw new RuntimeException("This is an exception.");
    }

    @Override
    public void uncaughtException(Thread t, Throwable e) {
        pass();
        phaser.arrive();
    }

    //--------------------- 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, String msg) {if (cond) pass(); else fail(msg);}
    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");}
}