/*

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

 *

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 * 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.

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import java.util.List;

import java.lang.management.*;

import jdk.test.lib.Platform;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

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

/* @test TestMetaspaceMemoryPool

 * @bug 8000754

 * @summary Tests that a MemoryPoolMXBeans is created for metaspace and that a

 *          MemoryManagerMXBean is created.

 * @library /test/lib

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

 *          java.management

 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops TestMetaspaceMemoryPool

 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:MaxMetaspaceSize=60m TestMetaspaceMemoryPool

 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers TestMetaspaceMemoryPool

 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:CompressedClassSpaceSize=60m TestMetaspaceMemoryPool

 */

public class TestMetaspaceMemoryPool {

    public static void main(String[] args) {

        verifyThatMetaspaceMemoryManagerExists();

        boolean isMetaspaceMaxDefined = InputArguments.containsPrefix("-XX:MaxMetaspaceSize");

        verifyMemoryPool(getMemoryPool("Metaspace"), isMetaspaceMaxDefined);

        if (Platform.is64bit()) {

            if (InputArguments.contains("-XX:+UseCompressedOops")) {

                MemoryPoolMXBean cksPool = getMemoryPool("Compressed Class Space");

                verifyMemoryPool(cksPool, true);

            }

        }

    }

    private static void verifyThatMetaspaceMemoryManagerExists() {

        List<MemoryManagerMXBean> managers = ManagementFactory.getMemoryManagerMXBeans();

        for (MemoryManagerMXBean manager : managers) {

            if (manager.getName().equals("Metaspace Manager")) {

                return;

            }

        }

        throw new RuntimeException("Expected to find a metaspace memory manager");

    }

    private static MemoryPoolMXBean getMemoryPool(String name) {

        List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();

        for (MemoryPoolMXBean pool : pools) {

            if (pool.getName().equals(name)) {

                return pool;

            }

        }

        throw new RuntimeException("Expected to find a memory pool with name " + name);

    }

    private static void verifyMemoryPool(MemoryPoolMXBean pool, boolean isMaxDefined) {

        MemoryUsage mu = pool.getUsage();

        long init = mu.getInit();

        long used = mu.getUsed();

        long committed = mu.getCommitted();

        long max = mu.getMax();

        assertGTE(init, 0L);

        assertGTE(used, init);

        assertGTE(committed, used);

        if (isMaxDefined) {

            assertGTE(max, committed);

        } else {

            assertEQ(max, -1L);

        }

    }

}