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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * accompanied this code).
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package jdk.jfr.event.runtime;

import java.nio.ByteBuffer;
import java.util.List;

import jdk.internal.misc.VM;

import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.test.lib.Asserts;
import jdk.test.lib.jfr.EventNames;
import jdk.test.lib.jfr.Events;

/**
 * @test
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 * @run main/othervm -XX:MaxDirectMemorySize=128m jdk.jfr.event.runtime.TestDirectMemoryStatisticsEvent
 * @run main/othervm jdk.jfr.event.runtime.TestDirectMemoryStatisticsEvent
 */
public class TestDirectMemoryStatisticsEvent {

    private static final String EVENT_PATH = EventNames.DirectMemoryStatistics;

    public static void main(String[] args) throws Throwable {
        try (Recording recording = new Recording()) {
            recording.enable(EVENT_PATH);
            recording.start();
            int rounds = 16;
            int size = 1 * 1024 * 1024; // 1M
            for (int i = 0; i < rounds; i++) {
                ByteBuffer.allocateDirect(size);
            }
            recording.stop();

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

            long count = 0;
            long totalCapacity = 0;
            long memoryUsed = 0;

            for (RecordedEvent event : events) {
                System.out.println(event);
                Asserts.assertTrue(Events.isEventType(event, EVENT_PATH), "Wrong event type");
                count = Math.max(count, Events.assertField(event, "count").getValue());
                totalCapacity = Math.max(totalCapacity, Events.assertField(event, "totalCapacity").getValue());
                memoryUsed = Math.max(memoryUsed, Events.assertField(event, "memoryUsed").getValue());
                Asserts.assertEquals(VM.maxDirectMemory(), Events.assertField(event, "maxCapacity").getValue());
            }

            Asserts.assertGreaterThanOrEqual(count, (long)rounds, "Too few count in statistics event");
            Asserts.assertGreaterThanOrEqual(totalCapacity, (long)(rounds * size), "Too few totalCapacity in statistics event");
            Asserts.assertGreaterThanOrEqual(memoryUsed, totalCapacity, "Too few memoryUsed in statistics event");
        }
    }
}