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/*
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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package org.glassfish.admin.monitor.jvm;

import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;
import org.glassfish.external.statistics.CountStatistic;
import org.glassfish.external.statistics.impl.CountStatisticImpl;
import org.glassfish.gmbal.AMXMetadata;
import org.glassfish.gmbal.Description;
import org.glassfish.gmbal.ManagedAttribute;
import org.glassfish.gmbal.ManagedObject;

/* jvm.class-loading-system */
// v2: com.sun.appserv:name=class-loading-system,type=class-loading-system,category=monitor,server=server
// v3: 
@AMXMetadata(type="class-loading-system-mon", group="monitoring")
@ManagedObject
@Description( "JVM Class Loading Statistics" )
public class JVMClassLoadingStatsProvider {

    private ClassLoadingMXBean clBean = ManagementFactory.getClassLoadingMXBean();

    private CountStatisticImpl loadedClassCount = new CountStatisticImpl("LoadedClassCount", CountStatisticImpl.UNIT_COUNT,
            "Number of classes currently loaded in the Java virtual machine");
    private CountStatisticImpl totalLoadedClassCount = new CountStatisticImpl("TotalLoadedClassCount", CountStatisticImpl.UNIT_COUNT,
            "Total number of classes that have been loaded since the Java virtual machine has started execution");
    private CountStatisticImpl unloadedClassCount = new CountStatisticImpl("UnLoadedClassCount", CountStatisticImpl.UNIT_COUNT,
            "Total number of classes unloaded since the Java virtual machine has started execution");

    @ManagedAttribute(id="loadedclass-count")
    @Description( "number of classes currently loaded in the JVM" )
    public CountStatistic getLoadedClassCount() {
        loadedClassCount.setCount(clBean.getLoadedClassCount());
        return loadedClassCount;
    }

    @ManagedAttribute(id="totalloadedclass-count")
    @Description( "total number of classes loaded since the JVM started" )
    public CountStatistic getTotalLoadedClassCount() {
        totalLoadedClassCount.setCount(clBean.getTotalLoadedClassCount());
        return totalLoadedClassCount;
    }

    @ManagedAttribute(id="unloadedclass-count")
    @Description( "total number of classes unloaded since the JVM started" )
    public CountStatistic getUnloadedClassCount() {
        unloadedClassCount.setCount(clBean.getUnloadedClassCount());
        return unloadedClassCount;
    }
}