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 * 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

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 * questions.

 */

/*

 * @test

 * @bug     6173675

 * @summary Basic test of ThreadMXBean.getThreadAllocatedBytes

 * @author  Paul Hohensee

 */

import java.lang.management.*;

public class ThreadAllocatedMemory {

    private static com.sun.management.ThreadMXBean mbean =

        (com.sun.management.ThreadMXBean)ManagementFactory.getThreadMXBean();

    private static boolean testFailed = false;

    private static boolean done = false;

    private static boolean done1 = false;

    private static Object obj = new Object();

    private static final int NUM_THREADS = 10;

    private static Thread[] threads = new Thread[NUM_THREADS];

    private static long[] sizes = new long[NUM_THREADS];

    public static void main(String[] argv)

        throws Exception {

        if (!mbean.isThreadAllocatedMemorySupported()) {

            return;

        }

        // disable allocated memory measurement

        if (mbean.isThreadAllocatedMemoryEnabled()) {

            mbean.setThreadAllocatedMemoryEnabled(false);

        }

        if (mbean.isThreadAllocatedMemoryEnabled()) {

            throw new RuntimeException(

                "ThreadAllocatedMemory is expected to be disabled");

        }

        Thread curThread = Thread.currentThread();

        long id = curThread.getId();

        long s = mbean.getThreadAllocatedBytes(id);

        if (s != -1) {

            throw new RuntimeException(

                "Invalid ThreadAllocatedBytes returned = " +

                s + " expected = -1");

        }

        // enable allocated memory measurement

        if (!mbean.isThreadAllocatedMemoryEnabled()) {

            mbean.setThreadAllocatedMemoryEnabled(true);

        }

        if (!mbean.isThreadAllocatedMemoryEnabled()) {

            throw new RuntimeException(

                "ThreadAllocatedMemory is expected to be enabled");

        }

        long size = mbean.getThreadAllocatedBytes(id);

        // implementation could have started measurement when

        // measurement was enabled, in which case size can be 0

        if (size < 0) {

            throw new RuntimeException(

                "Invalid allocated bytes returned = " + size);

        }

        doit();

        // Expected to be size1 >= size

        long size1 = mbean.getThreadAllocatedBytes(id);

        if (size1 < size) {

            throw new RuntimeException("Allocated bytes " + size1 +

                " expected >= " + size);

        }

        System.out.println(curThread.getName() +

            " Current thread allocated bytes = " + size +

            " allocated bytes = " + size1);

        // start threads, wait for them to block

        for (int i = 0; i < NUM_THREADS; i++) {

            threads[i] = new MyThread("MyThread-" + i);

            threads[i].start();

        }

        // threads block after doing some allocation

        waitUntilThreadBlocked();

        for (int i = 0; i < NUM_THREADS; i++) {

            sizes[i] = mbean.getThreadAllocatedBytes(threads[i].getId());

        }

        // let threads go and do some more allocation

        synchronized (obj) {

            done = true;

            obj.notifyAll();

        }

        // wait for threads to get going again.  we don't care if we

        // catch them in mid-execution or if some of them haven't

        // restarted after we're done sleeping.

        goSleep(400);

        for (int i = 0; i < NUM_THREADS; i++) {

            long newSize = mbean.getThreadAllocatedBytes(threads[i].getId());

            if (sizes[i] > newSize) {

                throw new RuntimeException("TEST FAILED: " +

                    threads[i].getName() +

                    " previous allocated bytes = " + sizes[i] +

                    " > current allocated bytes = " + newSize);

            }

            System.out.println(threads[i].getName() +

                " Previous allocated bytes = " + sizes[i] +

                " Current allocated bytes = " + newSize);

        }

        // let threads exit

        synchronized (obj) {

            done1 = true;

            obj.notifyAll();

        }

        for (int i = 0; i < NUM_THREADS; i++) {

            try {

                threads[i].join();

            } catch (InterruptedException e) {

                System.out.println("Unexpected exception is thrown.");

                e.printStackTrace(System.out);

                testFailed = true;

                break;

            }

        }

        if (testFailed) {

            throw new RuntimeException("TEST FAILED");

        }

        System.out.println("Test passed");

    }

    private static void goSleep(long ms) throws Exception {

        try {

            Thread.sleep(ms);

        } catch (InterruptedException e) {

            System.out.println("Unexpected exception is thrown.");

            throw e;

        }

    }

    private static void waitUntilThreadBlocked()

        throws Exception {

        int count = 0;

        while (count != NUM_THREADS) {

            goSleep(100);

            count = 0;

            for (int i = 0; i < NUM_THREADS; i++) {

                ThreadInfo info = mbean.getThreadInfo(threads[i].getId());

                if (info.getThreadState() == Thread.State.WAITING) {

                    count++;

                }

            }

        }

    }

    public static void doit() {

        String tmp = "";

        long hashCode = 0;

        for (int counter = 0; counter < 1000; counter++) {

            tmp += counter;

            hashCode = tmp.hashCode();

        }

        System.out.println(Thread.currentThread().getName() +

                           " hashcode: " + hashCode);

    }

    static class MyThread extends Thread {

        public MyThread(String name) {

            super(name);

        }

        public void run() {

            ThreadAllocatedMemory.doit();

            synchronized (obj) {

                while (!done) {

                    try {

                        obj.wait();

                    } catch (InterruptedException e) {

                        System.out.println("Unexpected exception is thrown.");

                        e.printStackTrace(System.out);

                        testFailed = true;

                        break;

                    }

                }

            }

            long size1 = mbean.getThreadAllocatedBytes(getId());

            ThreadAllocatedMemory.doit();

            long size2 = mbean.getThreadAllocatedBytes(getId());

            System.out.println(getName() + ": " +

                "ThreadAllocatedBytes  = " + size1 +

                " ThreadAllocatedBytes  = " + size2);

            if (size1 > size2) {

                throw new RuntimeException("TEST FAILED: " + getName() +

                    " ThreadAllocatedBytes = " + size1 +

                    " > ThreadAllocatedBytes = " + size2);

            }

            synchronized (obj) {

                while (!done1) {

                    try {

                        obj.wait();

                    } catch (InterruptedException e) {

                        System.out.println("Unexpected exception is thrown.");

                        e.printStackTrace(System.out);

                        testFailed = true;

                        break;

                    }

                }

            }

        }

    }

}