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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  }