/*

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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

 * accompanied this code).

 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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 */

/*

 * @test

 * @summary Ensure module information is cleaned when owning class loader unloads

 * @requires vm.opt.final.ClassUnloading

 * @modules java.base/jdk.internal.misc

 * @library /test/lib ..

 * @build sun.hotspot.WhiteBox

 * @compile/module=java.base java/lang/ModuleHelper.java

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx64m -Xmx64m LoadUnloadModuleStress 15000

 */

import java.lang.ref.WeakReference;

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

public class LoadUnloadModuleStress {

    private static long timeout;

    private static long timeStamp;

    public static byte[] garbage;

    public static volatile WeakReference<MyClassLoader> clweak;

    public static Object createModule() throws Throwable {

        MyClassLoader cl = new MyClassLoader();

        Object module = ModuleHelper.ModuleObject("mymodule", cl, new String [] {"PackageA"});

        assertNotNull(module);

        ModuleHelper.DefineModule(module, false, "9.0", "mymodule", new String[] { "PackageA" });

        clweak = new WeakReference<>(cl);

        return module;

    }

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

        timeout = Long.valueOf(args[0]);

        timeStamp = System.currentTimeMillis();

        while(System.currentTimeMillis() - timeStamp < timeout) {

            WeakReference<Object> modweak = new WeakReference<>(createModule());

            while(clweak.get() != null) {

                garbage = new byte[8192];

                System.gc();

            }

            assertNull(modweak.get());

        }

    }

    static class MyClassLoader extends ClassLoader { }

}