com.clustercontrol.selfcheck.monitor.JVMHeapMonitor.java Source code

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Here is the source code for com.clustercontrol.selfcheck.monitor.JVMHeapMonitor.java

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/*
    
Copyright (C) 2010 NTT DATA Corporation
    
This program is free software; you can redistribute it and/or
Modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, version 2.
    
This program 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 General Public License for more details.
    
 */

package com.clustercontrol.selfcheck.monitor;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.clustercontrol.bean.PriorityConstant;
import com.clustercontrol.maintenance.util.HinemosPropertyUtil;
import com.clustercontrol.util.MessageConstant;
import com.clustercontrol.util.apllog.AplLogger;

/**
 * Java VM????????
 */
public class JVMHeapMonitor extends SelfCheckMonitorBase {

    private static Log m_log = LogFactory.getLog(JVMHeapMonitor.class);

    public final String monitorId = "SYS_JVM_HEAP";
    public final String subKey = "";
    public final String application = "SELFCHECK (Java VM Heap)";

    private static final String JVM_FREEHEAP_THRESHOLD = "selfcheck.monitoring.jvm.freeheap.threshold";
    private static final String JVM_FREEHEAP = "selfcheck.monitoring.jvm.freeheap";

    /**
     * ????
     */
    @Override
    public String toString() {
        int jvmMinHeapThreshold = HinemosPropertyUtil
                .getHinemosPropertyNum(JVM_FREEHEAP_THRESHOLD, Long.valueOf(32)).intValue();
        return "monitoring jvm free heap (threshold = " + jvmMinHeapThreshold + " [mbyte] )";
    }

    /**
     * ID
     */
    @Override
    public String getMonitorId() {
        return monitorId;
    }

    /**
     * Java VM????????????
     * @return ????
     */
    @Override
    public void execute() {
        if (!HinemosPropertyUtil.getHinemosPropertyBool(JVM_FREEHEAP, true)) {
            m_log.debug("skip");
            return;
        }

        /**  */
        int freeHeapMByte = 0;
        boolean warn = true;

        /** ? */
        if (m_log.isDebugEnabled())
            m_log.debug("monitoring java vm heap size.");

        // ???MByte?????
        freeHeapMByte = getJVMHeapSize();
        int jvmMinHeapThreshold = HinemosPropertyUtil
                .getHinemosPropertyNum(JVM_FREEHEAP_THRESHOLD, Long.valueOf(32)).intValue();

        if (jvmMinHeapThreshold >= 0 && freeHeapMByte >= jvmMinHeapThreshold) {
            m_log.debug("size of java vm's free heap is enough. (free heap's size = " + freeHeapMByte
                    + " [MByte], threshold = " + jvmMinHeapThreshold + " [MByte])");
            warn = false;
        }

        if (warn) {
            m_log.info("size of java vm's free heap is low. (free heap's size = " + freeHeapMByte
                    + " [MByte], threshold = " + jvmMinHeapThreshold + " [MByte])");
        }
        if (!isNotify(subKey, warn)) {
            return;
        }

        String[] msgAttr1 = { Integer.toString(freeHeapMByte), Integer.toString(jvmMinHeapThreshold) };
        AplLogger.put(PriorityConstant.TYPE_WARNING, PLUGIN_ID, MessageConstant.MESSAGE_SYS_003_SYS_SFC, msgAttr1,
                "free heap of jvm (" + freeHeapMByte + " [mbyte]) is not enough (threshold " + jvmMinHeapThreshold
                        + " [mbyte]).");

        return;
    }

    /**
     * ???MByte?????<br/>
     * @return ???
     */
    public static int getJVMHeapSize() {
        return (int) (Runtime.getRuntime().freeMemory() / 1024 / 1024);
    }

}