/*

 * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 * @test

 * @bug 6717789

 * @summary Check that a lock is not held when a LeaseManager expires.

 * @author Eamonn McManus

 * @compile -XDignore.symbol.file=true LeaseManagerDeadlockTest.java

 */

import com.sun.jmx.event.LeaseManager;

import java.lang.management.ManagementFactory;

import java.lang.management.ThreadMXBean;

import java.util.Arrays;

import java.util.concurrent.Semaphore;

import java.util.concurrent.TimeUnit;

public class LeaseManagerDeadlockTest {

    public static String failure;

    public static LeaseManager leaseManager;

    public static Semaphore callbackThreadCompleted = new Semaphore(0);

    public static Object lock = new Object();

    public static Runnable triggerDeadlock = new Runnable() {

        public void run() {

            Runnable pingLeaseManager = new Runnable() {

                public void run() {

                    System.out.println("Ping thread starts");

                    synchronized (lock) {

                        leaseManager.lease(1);

                    }

                    System.out.println("Ping thread completes");

                }

            };

            Thread t = new Thread(pingLeaseManager);

            t.start();

            try {

                Thread.sleep(10);  // enough time for ping thread to grab lock

                synchronized (lock) {

                    t.join();

                }

            } catch (InterruptedException e) {

                fail(e.toString());

            }

            System.out.println("Callback thread completes");

            callbackThreadCompleted.release();

        }

    };

    public static void main(String[] args) throws Exception {

        // Also test that we can shorten the lease from its initial value.

        leaseManager = new LeaseManager(triggerDeadlock, 1000000);

        leaseManager.lease(1L);

        boolean callbackRan =

                callbackThreadCompleted.tryAcquire(3, TimeUnit.SECONDS);

        if (!callbackRan) {

            fail("Callback did not complete - probable deadlock");

            ThreadMXBean threads = ManagementFactory.getThreadMXBean();

            System.out.println(Arrays.toString(threads.findDeadlockedThreads()));

            System.out.println("PRESS RETURN");

            System.in.read();

        }

        if (failure == null)

            System.out.println("TEST PASSED");

        else

            throw new Exception("TEST FAILED: " + failure);

    }

    public static void fail(String why) {

        System.out.println("TEST FAILS: " + why);

        failure = why;

    }

}