/*

 * 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.

 *

 */

/*

 * @bug     4982289

 * @summary Utility class.

 * @author Mandy Chung

 */

import java.lang.management.*;

import java.util.*;

public class MemoryUtil {

    private static String INDENT = "    ";

    private static String formatSize(String name, long value) {

        StringBuffer buf = new StringBuffer(name + " = " + value);

        if (value > 0) {

            buf.append(" (" + (value >> 10) + "K)");

        }

        return buf.toString();

    }

    public static void printMemoryUsage(MemoryUsage usage) {

        System.out.println(INDENT + formatSize("Initial size  ", usage.getInit()));

        System.out.println(INDENT + formatSize("Used size     ", usage.getUsed()));

        System.out.println(INDENT + formatSize("Committd size ", usage.getCommitted()));

        System.out.println(INDENT + formatSize("Max size      ", usage.getMax()));

    }

    public static void printMemoryPool(MemoryPoolMXBean pool) {

        System.out.println(INDENT + "Memory Pool name: " + pool.getName());

        System.out.println(INDENT + "Type: " + pool.getType());

        System.out.println(INDENT + "Memory Usage: " +

            pool.getUsage());

        System.out.println(INDENT + "Threshold: " +

            (pool.isUsageThresholdSupported() ? pool.getUsageThreshold() : -1));

        System.out.print(INDENT + "Manager = [");

        String[] mgrs = pool.getMemoryManagerNames();

        for (int i = 0; i < mgrs.length; i++) {

            System.out.print(mgrs[i]);

            if (i < (mgrs.length - 1)) {

                System.out.print(" | ");

            }

        }

        System.out.println("]");

    }

    public static void printMemoryPools(List pools) {

        ListIterator iter = pools.listIterator();

        System.out.println(INDENT + "Number of memory pools = " + pools.size());

        while (iter.hasNext()) {

            MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();

            printMemoryPool(pool);

        }

    }

    public static void printMemoryManager(MemoryManagerMXBean mgr) {

        if (mgr instanceof GarbageCollectorMXBean) {

            GarbageCollectorMXBean gc = (GarbageCollectorMXBean) mgr;

            System.out.println(INDENT + "Garbage Collector name: " + gc.getName());

            System.out.println(INDENT + "GC Count: " + gc.getCollectionCount());

            System.out.println(INDENT + "GC Time : " + gc.getCollectionTime());

        } else {

            System.out.println(INDENT + "Memory Manager name: " + mgr.getName());

        }

        System.out.print("Pool = [");

        String[] pools = mgr.getMemoryPoolNames();

        for (int i = 0; i < pools.length; i++) {

            System.out.print(INDENT + pools[i]);

            if (i < (pools.length - 1)) {

                System.out.print(" | ");

            }

        }

        System.out.println("]");

    }

    public static void printMemoryManagers(List managers) {

        ListIterator iter = managers.listIterator();

        System.out.println(INDENT + "Number of memory managers = " +

            managers.size());

        while (iter.hasNext()) {

            MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();

            printMemoryManager(mgr);

        }

    }

    public static void printMemoryNotificationInfo

        (MemoryNotificationInfo minfo, String type) {

        System.out.print("Notification for " + minfo.getPoolName());

        System.out.print(" [type = " + type);

        System.out.println(" count = " + minfo.getCount() + "]");

        System.out.println(INDENT + "usage = " + minfo.getUsage());

    }

}