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OpenCms is an enterprise-ready, easy to use website content management system based on Java and XML technology. Offering a complete set of features, OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently.

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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * For further information about Alkacon Software GmbH & Co. KG, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.monitor;

/**
 * Data structure for dealing with memory status information.

* * @since 6.0.0 */ public class CmsMemoryStatus { /** The count used to calculate the average. */ private int m_count; /** The current free memory, in megabytes. */ private long m_freeMemory; /** The maximum available memory, in megabytes. */ private long m_maxMemory; /** The amount of memory currently availble to the JVM, in megabytes. */ private long m_totalMemory; /** The current memory usage, in percent. */ private long m_usage; /** The amount of memory currently used, in megabytes. */ private long m_usedMemory; /** * Initializes a new instance of the memory status with the current memory values.

*/ public CmsMemoryStatus() { update(); } /** * Calculates the average memory consumption by updating the stored information with * the provided current information.

* * @param currentStatus the memory status to update the average with */ public void calculateAverage(CmsMemoryStatus currentStatus) { int newCount = m_count + 1; m_maxMemory = ((m_count * m_maxMemory) + currentStatus.getMaxMemory()) / newCount; m_totalMemory = ((m_count * m_totalMemory) + currentStatus.getTotalMemory()) / newCount; m_usedMemory = ((m_count * m_usedMemory) + currentStatus.getUsedMemory()) / newCount; m_freeMemory = ((m_count * m_freeMemory) + currentStatus.getFreeMemory()) / newCount; m_usage = (m_usedMemory * 100) / m_maxMemory; m_count = newCount; } /** * Returns the count used to calculate the average.

* * @return the count used to calculate the average */ public int getCount() { return m_count; } /** * Returns the current free memory, in megabytes.

* * @return the current free memory, in megabytes */ public long getFreeMemory() { return m_freeMemory; } /** * Returns the maximum available memory, in megabytes.

* * @return the maximum available memory, in megabytes */ public long getMaxMemory() { return m_maxMemory; } /** * Returns the amount of memory currently availble to the JVM, in megabytes.

* * @return the amount of memory currently availble to the JVM, in megabytes */ public long getTotalMemory() { return m_totalMemory; } /** * Returns the current memory usage, in percent.

* * @return the current memory usage, in percent */ public long getUsage() { return m_usage; } /** * Returns the amount of memory currently used, in megabytes.

* * @return the amount of memory currently used, in megabytes */ public long getUsedMemory() { return m_usedMemory; } /** * Updates this memory status with the current memory information.

*/ public void update() { m_maxMemory = Runtime.getRuntime().maxMemory() / 1048576; m_totalMemory = Runtime.getRuntime().totalMemory() / 1048576; m_usedMemory = (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1048576; m_freeMemory = m_maxMemory - m_usedMemory; m_usage = (m_usedMemory * 100) / m_maxMemory; } }





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