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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License. You
 * may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License. See accompanying
 * LICENSE file.
 */

package com.gemstone.gemfire.internal;

import com.gemstone.gemfire.*;

/**
 * This class provides the interface for statistics about a
 * Linux operating system process that is using a GemFire system.
 */
public class LinuxProcessStats
{
  final static int imageSizeINT = 0;
  final static int rssSizeINT = 1;

  private final static StatisticsType myType;

  private static void checkOffset(String name, int offset) {
    int id = myType.nameToId(name);
    Assert.assertTrue(offset == id, "Expected the offset for " + name + " to be " + offset + " but it was " + id);
  }
  
  static {
    StatisticsTypeFactory f = StatisticsTypeFactoryImpl.singleton();
    myType = f.createType("LinuxProcessStats",
                          "Statistics on a Linux process.",
                          new StatisticDescriptor[] {
                            f.createIntGauge("imageSize",
                                             "The size of the process's image in megabytes.",
                                             "megabytes"),
                            f.createIntGauge("rssSize",
                                             "The size of the process's resident set size in megabytes. (assumes PAGESIZE=4096, specify -Dgemfire.statistics.linux.pageSize= to adjust)",
                                             "megabytes"),
                          });
    checkOffset("imageSize", imageSizeINT);
    checkOffset("rssSize", rssSizeINT);
  }

  private LinuxProcessStats() {
    // no instances allowed
  }
  public static StatisticsType getType() {
    return myType;
  }

  /**
   * Returns a ProcessStats that wraps Linux process
   * Statistics. 
   *
   * @since 3.5
   */
  static ProcessStats createProcessStats(final Statistics stats) {
    if (stats instanceof LocalStatisticsImpl) {
      HostStatHelper.refresh((LocalStatisticsImpl) stats);
    } // otherwise its a Dummy implementation so do nothing
    return new ProcessStats(stats) {
      @Override
        public long getProcessSize() {
          return stats.getInt(rssSizeINT);
        }
      };
  }

}