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/* TestMemoryPool.java -- Tests the memory pool beans.

   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath examples.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA. */

package gnu.classpath.examples.management;

import java.lang.management.ManagementFactory;

import java.lang.management.MemoryPoolMXBean;

import java.util.Arrays;

import java.util.Iterator;

public class TestMemoryPool

{

  /**

   * 1mb in bytes

   */

  private static final int MB = 1 << 20;

  public static void main(String[] args)

  {

    Iterator beans = ManagementFactory.getMemoryPoolMXBeans().iterator();

    while (beans.hasNext())

      {

        MemoryPoolMXBean bean = (MemoryPoolMXBean) beans.next();

        System.out.println("Bean: " + bean);

        System.out.println("Name: " + bean.getName());

        System.out.println("Collection usage: " + bean.getCollectionUsage());

        boolean collectionUsage = bean.isCollectionUsageThresholdSupported();

        System.out.println("Collection usage threshold supported: "

                           + collectionUsage);

        if (collectionUsage)

          {

            System.out.println("Collection usage threshold: "

                               + bean.getCollectionUsageThreshold());

            System.out.println("Setting collection usage threshold to 1MB ("

                               + MB + " bytes)");

            bean.setCollectionUsageThreshold(MB);

            System.out.println("Collection usage threshold: "

                               + bean.getCollectionUsageThreshold());

            System.out.println("Collection usage threshold count: "

                               + bean.getCollectionUsageThresholdCount());

            System.out.println("Collection usage threshold exceeded: "

                               + (bean.isCollectionUsageThresholdExceeded()

                                  ? "yes" : "no"));

          }

        System.out.println("Memory manager names: "

                           + Arrays.toString(bean.getMemoryManagerNames()));

        System.out.println("Peak usage: " + bean.getPeakUsage());

        System.out.println("Current usage: " + bean.getUsage());

        System.out.println("Resetting peak usage...");

        bean.resetPeakUsage();

        System.out.println("Peak usage: " + bean.getPeakUsage());

        System.out.println("Current usage: " + bean.getUsage());

        boolean usage = bean.isUsageThresholdSupported();

        System.out.println("Usage threshold supported: " + usage);

        if (usage)

          {

            System.out.println("Usage threshold: "

                               + bean.getUsageThreshold());

            System.out.println("Setting usage threshold to 1MB ("

                               + MB + " bytes)");

            bean.setUsageThreshold(MB);

            System.out.println("Usage threshold: "

                               + bean.getUsageThreshold());

            System.out.println("Usage threshold count: "

                               + bean.getUsageThresholdCount());

            System.out.println("Usage threshold exceeded: "

                               + (bean.isUsageThresholdExceeded()

                                  ? "yes" : "no"));

          }

        System.out.println("Valid: " + (bean.isValid() ? "yes" : "no"));

      }

  }

}