/*

 * Copyright (c) 2013, 2018, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package jdk.jfr.event.runtime;

import static jdk.test.lib.Asserts.assertFalse;

import static jdk.test.lib.Asserts.assertTrue;

import java.time.Duration;

import java.util.List;

import java.util.concurrent.CountDownLatch;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.Events;

import jdk.test.lib.management.ThreadMXBeanTool;

import jdk.test.lib.thread.TestThread;

import jdk.test.lib.thread.XRun;

/*

 * @test

 * @key jfr

 * @library /test/lib

 *

 * @run main/othervm jdk.jfr.event.runtime.TestJavaBlockedEvent

 */

public class TestJavaBlockedEvent {

    private static final String EVENT_NAME = EventNames.JavaMonitorEnter;

    private static final long THRESHOLD_MILLIS = 1;

    static class Lock {

    }

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

        Recording recording = new Recording();

        recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(THRESHOLD_MILLIS));

        recording.start();

        final Lock lock = new Lock();

        final CountDownLatch blockerInLock = new CountDownLatch(1);

        final CountDownLatch blockingFinished = new CountDownLatch(1);

        final CountDownLatch blockedFinished = new CountDownLatch(1);

        TestThread blockerThread = new TestThread(new XRun() {

            @Override

            public void xrun() throws Throwable {

                synchronized (lock) {

                    blockerInLock.countDown();

                    blockingFinished.await();

                }

                blockedFinished.await();

            }

        });

        TestThread blockedThread = new TestThread(new XRun() {

            @Override

            public void xrun() throws Throwable {

                blockerInLock.await();

                synchronized (lock) {

                    blockedFinished.countDown();

                }

            }

        });

        blockerThread.start();

        blockedThread.start();

        blockerInLock.await();

        ThreadMXBeanTool.waitUntilBlockingOnObject(blockedThread, Thread.State.BLOCKED, lock);

        Thread.sleep(2 * THRESHOLD_MILLIS);

        blockingFinished.countDown();

        blockedFinished.await();

        blockedThread.join();

        blockerThread.join();

        recording.stop();

        List<RecordedEvent> events = Events.fromRecording(recording);

        boolean isAnyFound = false;

        for (RecordedEvent event : events) {

            System.out.println("Event:" + event);

            if (event.getThread().getJavaThreadId() == blockedThread.getId()) {

                if (isMyLock(Events.assertField(event, "monitorClass.name").getValue())) {

                    Events.assertEventThread(event, "previousOwner", blockerThread);

                    Events.assertField(event, "address").above(0L);

                    assertFalse(isAnyFound, "Found multiple events");

                    isAnyFound = true;

                }

            }

        }

        assertTrue(isAnyFound, "No blocking event from " + blockedThread.getName());

    }

    private static boolean isMyLock(String className) {

        return Lock.class.getName().replace('.', '/').equals(className);

    }

}