/*

 * Copyright (c) 2014, 2015, 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.

 */

import jdk.test.lib.Asserts;

import jdk.test.lib.Utils;

import java.lang.management.ManagementFactory;

import java.lang.management.MemoryNotificationInfo;

import java.lang.management.MemoryPoolMXBean;

import java.util.HashMap;

import java.util.Map;

import java.util.concurrent.atomic.AtomicInteger;

import javax.management.ListenerNotFoundException;

import javax.management.Notification;

import javax.management.NotificationEmitter;

import javax.management.NotificationListener;

import sun.hotspot.code.BlobType;

/*

 * @test PoolsIndependenceTest

 * @build PoolsIndependenceTest

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *     sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:-UseCodeCacheFlushing

 *     -XX:-MethodFlushing -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI

 *     -XX:+SegmentedCodeCache PoolsIndependenceTest

 * @summary testing of getUsageThreshold()

 */

public class PoolsIndependenceTest implements NotificationListener {

    private final Map<String, AtomicInteger> counters;

    private final BlobType btype;

    private volatile long lastEventTimestamp;

    public PoolsIndependenceTest(BlobType btype) {

        counters = new HashMap<>();

        for (BlobType bt : BlobType.getAvailable()) {

            counters.put(bt.getMemoryPool().getName(), new AtomicInteger(0));

        }

        this.btype = btype;

        lastEventTimestamp = 0;

        CodeCacheUtils.disableCollectionUsageThresholds();

    }

    public static void main(String[] args) {

        for (BlobType bt : BlobType.getAvailable()) {

            new PoolsIndependenceTest(bt).runTest();

        }

    }

    protected void runTest() {

        MemoryPoolMXBean bean = btype.getMemoryPool();

        ((NotificationEmitter) ManagementFactory.getMemoryMXBean()).

                addNotificationListener(this, null, null);

        bean.setUsageThreshold(bean.getUsage().getUsed() + 1);

        long beginTimestamp = System.currentTimeMillis();

        CodeCacheUtils.WB.allocateCodeBlob(

                CodeCacheUtils.ALLOCATION_SIZE, btype.id);

        CodeCacheUtils.WB.fullGC();

        /* waiting for expected event to be received plus double the time took

         to receive expected event(for possible unexpected) and

         plus 1 second in case expected event received (almost)immediately */

        Utils.waitForCondition(() -> {

            long currentTimestamp = System.currentTimeMillis();

            int eventsCount

                    = counters.get(btype.getMemoryPool().getName()).get();

            if (eventsCount > 0) {

                if (eventsCount > 1) {

                    return true;

                }

                long timeLastEventTook

                        = beginTimestamp - lastEventTimestamp;

                long timeoutValue

                        = 1000L + beginTimestamp + 3L * timeLastEventTook;

                return currentTimestamp > timeoutValue;

            }

            return false;

        });

        for (BlobType bt : BlobType.getAvailable()) {

            int expectedNotificationsAmount = bt.equals(btype) ? 1 : 0;

            CodeCacheUtils.assertEQorGTE(btype, counters.get(bt.getMemoryPool().getName()).get(),

                    expectedNotificationsAmount, String.format("Unexpected "

                            + "amount of notifications for pool: %s",

                            bt.getMemoryPool().getName()));

        }

        try {

            ((NotificationEmitter) ManagementFactory.getMemoryMXBean()).

                    removeNotificationListener(this);

        } catch (ListenerNotFoundException ex) {

            throw new AssertionError("Can't remove notification listener", ex);

        }

        System.out.printf("INFO: Scenario with %s finished%n", bean.getName());

    }

    @Override

    public void handleNotification(Notification notification, Object handback) {

        String nType = notification.getType();

        String poolName

                = CodeCacheUtils.getPoolNameFromNotification(notification);

        // consider code cache events only

        if (CodeCacheUtils.isAvailableCodeHeapPoolName(poolName)) {

            Asserts.assertEQ(MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED,

                    nType, "Unexpected event received: " + nType);

            // receiving events from available CodeCache-related beans only

            if (counters.get(poolName) != null) {

                counters.get(poolName).incrementAndGet();

                lastEventTimestamp = System.currentTimeMillis();

            }

        }

    }

}