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Java example source code file (SetMaxPriority.java)

This example Java source code file (SetMaxPriority.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

exception, runtimeexception, setmaxpriority, threadgroup

The SetMaxPriority.java Java example source code

/*
 * Copyright (c) 2007, 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 4708197 6497629
 * @summary Test for max priority setting that matches spec
 * @author Pete Soper
 */

public class SetMaxPriority {

    public static void main(String args[]) throws Exception {
        ThreadGroup tg = new ThreadGroup("foo");
        ThreadGroup ptg = tg.getParent();
        int currentMaxPriority = tg.getMaxPriority();
        int halfMaxPriority = ptg.getMaxPriority() / 2;
        if (halfMaxPriority - Thread.MIN_PRIORITY < 2) {
            throw new RuntimeException("SetMaxPriority test no longer valid: starting parent max priority too close to Thread.MIN_PRIORITY");
        }
        tg.setMaxPriority(halfMaxPriority - 2);
        currentMaxPriority = tg.getMaxPriority();
        if (currentMaxPriority != halfMaxPriority - 2) {
            throw new RuntimeException("SetMaxPriority failed: max priority not changed");
        }

        // This will fail if bug 6497629 is present because the min tests is
        // being made with the (just lowered) max instead of the parent max,
        // preventing the priority from being moved back up.
        tg.setMaxPriority(currentMaxPriority + 1);
        int newMaxPriority = tg.getMaxPriority();
        if (newMaxPriority != currentMaxPriority + 1) {
            throw new RuntimeException("SetMaxPriority failed: defect 6497629 present");
        }

        // Confirm that max priorities out of range on both ends have no
        // effect.
        for (int badPriority : new int[] {Thread.MIN_PRIORITY - 1,
                                          Thread.MAX_PRIORITY + 1}) {
            int oldPriority = tg.getMaxPriority();
            tg.setMaxPriority(badPriority);
            if (oldPriority != tg.getMaxPriority())
                throw new RuntimeException(
                    "setMaxPriority bad arg not ignored as specified");
        }

        System.out.println("SetMaxPriority passed");
    }
}

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