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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * This code is distributed in the hope that it will be useful, but WITHOUT

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 * 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

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package jdk.jfr.event.runtime;

import java.time.Duration;

import java.util.List;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedClass;

import jdk.jfr.consumer.RecordedClassLoader;

import jdk.jfr.consumer.RecordedEvent;

import jdk.test.lib.Asserts;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.Events;

import jdk.test.lib.jfr.TestClassLoader;

/**

 * @test

 * @summary The test verifies that a class unload event is created when class is unloaded

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib /test/jdk

 * @build jdk.jfr.event.runtime.TestClasses

 * @run main/othervm -Xlog:class+unload -Xlog:gc -Xmx16m jdk.jfr.event.runtime.TestClassUnloadEvent

 */

public final class TestClassUnloadEvent {

    private final static String TEST_CLASS_NAME = "jdk.jfr.event.runtime.TestClasses";

    private final static String EVENT_PATH = EventNames.ClassUnload;

    // Declare unloadableClassLoader as "public static"

    // to prevent the compiler to optimize away all unread writes

    public static TestClassLoader unloadableClassLoader;

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

        Recording recording = new Recording();

        recording.enable(EVENT_PATH).withThreshold(Duration.ofMillis(0));

        unloadableClassLoader = new TestClassLoader();

        recording.start();

        unloadableClassLoader.loadClass(TEST_CLASS_NAME);

        unloadableClassLoader = null;

        System.gc();

        recording.stop();

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

        Events.hasEvents(events);

        boolean isAnyFound = false;

        for (RecordedEvent event : events) {

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

            RecordedClass unloadedClass = event.getValue("unloadedClass");

            if (TEST_CLASS_NAME.equals(unloadedClass.getName())) {

                RecordedClassLoader definingClassLoader = unloadedClass.getClassLoader();

                Asserts.assertEquals(TestClassLoader.class.getName(), definingClassLoader.getType().getName(),

                    "Expected " + TestClassLoader.class.getName() + ", got " + definingClassLoader.getType().getName());

                Asserts.assertEquals(TestClassLoader.CLASS_LOADER_NAME, definingClassLoader.getName(),

                    "Expected " + TestClassLoader.CLASS_LOADER_NAME + ", got " + definingClassLoader.getName());

                Asserts.assertFalse(isAnyFound, "Found more than 1 event");

                isAnyFound = true;

            }

        }

        Asserts.assertTrue(isAnyFound, "No events found");

    }

}