/*

 * Copyright (c) 2016, 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.

 */

/*

 * @test

 * @key gc

 * @bug 8114823

 * @requires vm.gc == null

 * @requires vm.opt.ExplicitGCInvokesConcurrent != true

 * @requires vm.opt.ClassUnloading != true

 * @library /test/lib

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

 *          java.management

 * @build sun.hotspot.WhiteBox

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 *

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

 *                   -XX:-ClassUnloading -XX:+UseG1GC TestClassUnloadingDisabled

 *

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

 *                   -XX:-ClassUnloading -XX:+UseSerialGC TestClassUnloadingDisabled

 *

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

 *                   -XX:-ClassUnloading -XX:+UseParallelGC TestClassUnloadingDisabled

 *

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

 *                   -XX:-ClassUnloading -XX:+UseConcMarkSweepGC TestClassUnloadingDisabled

 */

import java.io.File;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import sun.hotspot.WhiteBox;

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

public class TestClassUnloadingDisabled {

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

        final WhiteBox wb = WhiteBox.getWhiteBox();

        // Fetch the dir where the test class and the class

        // to be loaded resides.

        String classDir = TestClassUnloadingDisabled.class.getProtectionDomain().getCodeSource().getLocation().getPath();

        String className = "ClassToLoadUnload";

        assertFalse(wb.isClassAlive(className), "Should not be loaded yet");

        // The NoPDClassLoader handles loading classes in the test directory

        // and loads them without a protection domain, which in some cases

        // keeps the class live regardless of marking state.

        NoPDClassLoader nopd = new NoPDClassLoader(classDir);

        nopd.loadClass(className);

        assertTrue(wb.isClassAlive(className), "Class should be loaded");

        // Clear the class-loader, class and object references to make

        // class unloading possible.

        nopd = null;

        System.gc();

        assertTrue(wb.isClassAlive(className), "Class should not have ben unloaded");

    }

}

class NoPDClassLoader extends ClassLoader {

    String path;

    NoPDClassLoader(String path) {

        this.path = path;

    }

    public Class<?> loadClass(String name) throws ClassNotFoundException {

        byte[] cls = null;

        File f = new File(path,name + ".class");

        // Delegate class loading if class not present in the given

        // directory.

        if (!f.exists()) {

            return super.loadClass(name);

        }

        try {

            Path path = Paths.get(f.getAbsolutePath());

            cls = Files.readAllBytes(path);

        } catch (IOException e) {

            throw new ClassNotFoundException(name);

        }

        // Define class with no protection domain and resolve it.

        return defineClass(name, cls, 0, cls.length, null);

    }

}

class ClassToLoadUnload {

}