| /******************************************************************************* |
| * Copyright (c) 2012 Laurent CARON |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Laurent CARON (laurent.caron at gmail dot com) - initial API and implementation |
| *******************************************************************************/ |
| package org.mihalis.opal.systemMonitor; |
| |
| import java.lang.management.ManagementFactory; |
| |
| import javax.management.MBeanServerConnection; |
| import javax.management.ObjectName; |
| |
| /** |
| * Instances of this class represent a sample that contains the OS memory usage. |
| */ |
| public class PhysicalMemorySample implements Sample { |
| |
| /** The Constant TOTAL_PHYSICAL_MEMORY_SIZE. */ |
| private static final String TOTAL_PHYSICAL_MEMORY_SIZE = "TotalPhysicalMemorySize"; |
| |
| /** The Constant FREE_PHYSICAL_MEMORY_SIZE. */ |
| private static final String FREE_PHYSICAL_MEMORY_SIZE = "FreePhysicalMemorySize"; |
| |
| /** The Constant OBJECT_NAME_ATTRIBUTE. */ |
| private static final String OBJECT_NAME_ATTRIBUTE = "java.lang:type=OperatingSystem"; |
| |
| /** The m bean server connection. */ |
| private final MBeanServerConnection mBeanServerConnection = ManagementFactory.getPlatformMBeanServer(); |
| |
| /** The object name. */ |
| private ObjectName objectName; |
| |
| /** |
| * Constructor. |
| */ |
| PhysicalMemorySample() { |
| try { |
| this.objectName = new ObjectName(OBJECT_NAME_ATTRIBUTE); |
| } catch (final Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** |
| * Gets the value. |
| * |
| * @return the value |
| * @see org.mihalis.opal.systemMonitor.Sample#getValue() |
| */ |
| @Override |
| public double getValue() { |
| try { |
| final double memSize = ((Long) this.mBeanServerConnection.getAttribute(this.objectName, FREE_PHYSICAL_MEMORY_SIZE)).longValue() / 1024.0d / 1024.0d; |
| return getMaxValue() - memSize; |
| } catch (final Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** |
| * Gets the max value. |
| * |
| * @return the max value |
| * @see org.mihalis.opal.systemMonitor.Sample#getMaxValue() |
| */ |
| @Override |
| public double getMaxValue() { |
| try { |
| return ((Long) this.mBeanServerConnection.getAttribute(this.objectName, TOTAL_PHYSICAL_MEMORY_SIZE)).longValue() / 1024.0d / 1024.0d; |
| } catch (final Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| } |