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    1   /**
    2    * Copyright (c) 2002-2011 "Neo Technology,"
    3    * Network Engine for Objects in Lund AB [http://neotechnology.com]
    4    *
    5    * This file is part of Neo4j.
    6    *
    7    * Neo4j is free software: you can redistribute it and/or modify
    8    * it under the terms of the GNU General Public License as published by
    9    * the Free Software Foundation, either version 3 of the License, or
    10   * (at your option) any later version.
    11   *
    12   * This program is distributed in the hope that it will be useful,
    13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    15   * GNU General Public License for more details.
    16   *
    17   * You should have received a copy of the GNU General Public License
    18   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    19   */
    20  package org.neo4j.server.rrd;
    21
    22  import javax.management.MBeanServer;
    23  import javax.management.MalformedObjectNameException;
    24  import javax.management.ObjectName;
    25  import javax.management.openmbean.CompositeDataSupport;
    26  import java.lang.management.ManagementFactory;
    27
    28  public class MemoryUsedSampleable implements Sampleable
    29  {
    30      private ObjectName memoryName;
    31      private MBeanServer mbeanServer;
    32
    33      public MemoryUsedSampleable() throws MalformedObjectNameException
    34      {
    35          memoryName = new ObjectName( "java.lang:type=Memory" );
    36          mbeanServer = ManagementFactory.getPlatformMBeanServer();
    37      }
    38
    39      public String getName()
    40      {
    41          return "memory_usage_percent";
    42      }
    43
    44      public long getValue()
    45      {
    46          try
    47          {
    48              long used = (Long)( (CompositeDataSupport)mbeanServer.getAttribute( memoryName, "HeapMemoryUsage" ) ).get( "used" );
    49              long max =  (Long)( (CompositeDataSupport)mbeanServer.getAttribute( memoryName, "HeapMemoryUsage" ) ).get( "max" );
    50              return (long) Math.ceil((used / (double)max) * 100);
    51          }
    52          catch ( Exception e )
    53          {
    54              throw new RuntimeException( e );
    55          }
    56      }
    57  }