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package org.glassfish.admin.monitor.jvm;

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
import org.glassfish.external.statistics.CountStatistic;
import org.glassfish.external.statistics.StringStatistic;
import org.glassfish.external.statistics.impl.CountStatisticImpl;
import org.glassfish.external.statistics.impl.StatisticImpl;
import org.glassfish.external.statistics.impl.StringStatisticImpl;
import org.glassfish.gmbal.AMXMetadata;
import org.glassfish.gmbal.Description;
import org.glassfish.gmbal.ManagedAttribute;
import org.glassfish.gmbal.ManagedObject;

/* server.jvm.thread-system */
// v2 mbean: com.sun.appserv:name=thread-system,type=thread-system,category=monitor,server=server
// v3 mbean:
@AMXMetadata(type="thread-system-mon", group="monitoring")
@ManagedObject
@Description( "JVM Thread System Statistics" )
public class JVMThreadSystemStatsProvider {
    
    private ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
    
    private StringStatisticImpl allThreadIds = new StringStatisticImpl(
            "LiveThreads", "String", "Returns all live thread IDs" );
    private CountStatisticImpl currentThreadCpuTime = new CountStatisticImpl(
            "CurrentThreadCpuTime", StatisticImpl.UNIT_NANOSECOND,
                "Returns the total CPU time for the current thread in nanoseconds" );
    private CountStatisticImpl currentThreadUserTime = new CountStatisticImpl(
            "CurrentThreadUserTime", StatisticImpl.UNIT_NANOSECOND,
                "Returns the CPU time that the current thread has executed in user mode in nanoseconds" );
    private CountStatisticImpl daemonThreadCount = new CountStatisticImpl(
            "DaemonThreadCount", StatisticImpl.UNIT_COUNT,
                "Returns the current number of live daemon threads" );
    private StringStatisticImpl deadlockedThreads = new StringStatisticImpl(
            "DeadlockedThreads", "String",
                "Finds cycles of threads that are in deadlock waiting to acquire object monitors or ownable synchronizers" );
    private StringStatisticImpl monitorDeadlockedThreads = new StringStatisticImpl(
            "MonitorDeadlockedThreads", "String",
                "Finds cycles of threads that are in deadlock waiting to acquire object monitors" );
    private CountStatisticImpl peakThreadCount = new CountStatisticImpl(
            "PeakThreadCount", StatisticImpl.UNIT_COUNT,
                "Returns the peak live thread count since the Java virtual machine started or peak was reset" );
    private CountStatisticImpl threadCount = new CountStatisticImpl(
            "ThreadCount", StatisticImpl.UNIT_COUNT,
                "Returns the current number of live threads including both daemon and non-daemon threads" );
    private CountStatisticImpl totalStartedThreadCount = new CountStatisticImpl(
            "TotalStartedThreadCount", StatisticImpl.UNIT_COUNT,
                "Returns the total number of threads created and also started since the Java virtual machine started" );

    @ManagedAttribute(id="allthreadids")
    @Description( "Returns all live thread IDs" )
    public StringStatistic getAllThreadIds() {
        long[] ids = this.threadBean.getAllThreadIds();
        StringBuffer sb = new StringBuffer();
        boolean first = true;
        for (long id : ids) {
            if(first)
                first = false;
            else
                sb.append(',');

            sb.append(id);
        }
        this.allThreadIds.setCurrent(sb.toString());
        return allThreadIds;
    }

    @ManagedAttribute(id="currentthreadcputime")
    @Description( "Returns the total CPU time for the current thread in nanoseconds" )
    public CountStatistic getCurrentThreadCpuTime() {
        this.currentThreadCpuTime.setCount(threadBean.getCurrentThreadCpuTime());
        return this.currentThreadCpuTime;
    }

    @ManagedAttribute(id="currentthreadusertime")
    @Description( "Returns the CPU time that the current thread has executed in user mode in nanoseconds" )
    public CountStatistic getCurrentThreadUserTime() {
        this.currentThreadUserTime.setCount(threadBean.getCurrentThreadUserTime());
        return this.currentThreadUserTime;
    }

    @ManagedAttribute(id="daemonthreadcount")
    @Description( "Returns the current number of live daemon threads" )
    public CountStatistic getDaemonThreadCount() {
        this.daemonThreadCount.setCount(threadBean.getDaemonThreadCount());
        return this.daemonThreadCount;
    }

    @ManagedAttribute(id="deadlockedthreads")
    @Description( "Finds cycles of threads that are in deadlock waiting to acquire object monitors or ownable synchronizers" )
    public StringStatistic getDeadlockedThreads() {
        long[] threads = threadBean.findDeadlockedThreads();
        if (threads == null) {
            this.deadlockedThreads.setCurrent("None of the threads are deadlocked.");
        } else {
            StringBuffer sb = new StringBuffer();
            for (long thread : threads) {
                sb.append(thread);
                sb.append(',');
            }
            this.deadlockedThreads.setCurrent(sb.toString());
        }
        return deadlockedThreads;
    }

    @ManagedAttribute(id="monitordeadlockedthreads")
    @Description( "Finds cycles of threads that are in deadlock waiting to acquire object monitors" )
    public StringStatistic getMonitorDeadlockedThreads() {
        long[] threads = threadBean.findMonitorDeadlockedThreads();
        if (threads == null) {
            this.monitorDeadlockedThreads.setCurrent("None of the threads are monitor deadlocked.");
        } else {
            StringBuffer sb = new StringBuffer();
            for (long thread : threads) {
                sb.append(thread);
                sb.append(',');
            }
            this.monitorDeadlockedThreads.setCurrent(sb.toString());
        }
        return this.monitorDeadlockedThreads;
    }

    @ManagedAttribute(id="peakthreadcount")
    @Description( "Returns the peak live thread count since the Java virtual machine started or peak was reset" )
    public CountStatistic getPeakThreadCount() {
        this.peakThreadCount.setCount(threadBean.getPeakThreadCount());
        return this.peakThreadCount;
    }

    @ManagedAttribute(id="threadcount")
    @Description( "Returns the current number of live threads including both daemon and non-daemon threads" )
    public CountStatistic getThreadCount() {
        threadCount.setCount(threadBean.getThreadCount());
        return threadCount;
    }

    @ManagedAttribute(id="totalstartedthreadcount")
    @Description( "Returns the total number of threads created and also started since the Java virtual machine started" )
    public CountStatistic getTotalStartedThreadCount() {
        totalStartedThreadCount.setCount(threadBean.getTotalStartedThreadCount());
        return totalStartedThreadCount;
    }
}