com.sun.enterprise.v3.services.impl.monitor.stats.ThreadPoolStatsProvider Maven / Gradle / Ivy

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// Portions Copyright [2016] [Payara Foundation and/or its affiliates]

package com.sun.enterprise.v3.services.impl.monitor.stats;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.glassfish.external.probe.provider.annotations.ProbeListener;
import org.glassfish.external.probe.provider.annotations.ProbeParam;
import org.glassfish.external.statistics.CountStatistic;
import org.glassfish.external.statistics.annotations.Reset;
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;
import org.glassfish.grizzly.threadpool.ThreadPoolConfig;

/**
 * Thread Pool statistics
 * 
 * @author Alexey Stashok
 */
@AMXMetadata(type = "thread-pool-mon", group = "monitoring")
@ManagedObject
@Description("Thread Pool Statistics")
public class ThreadPoolStatsProvider implements StatsProvider {

    private final String name;
    protected final CountStatisticImpl maxThreadsCount = new CountStatisticImpl("MaxThreads", "count", "Maximum number of threads allowed in the thread pool");
    protected final CountStatisticImpl coreThreadsCount = new CountStatisticImpl("CoreThreads", "count", "Core number of threads in the thread pool");
    
    protected final CountStatisticImpl totalExecutedTasksCount = new CountStatisticImpl("TotalExecutedTasksCount", "count", "Provides the total number of tasks, which were executed by the thread pool");
    protected final CountStatisticImpl currentThreadCount = new CountStatisticImpl("CurrentThreadCount", "count", "Provides the number of request processing threads currently in the listener thread pool");
    protected final CountStatisticImpl currentThreadsBusy = new CountStatisticImpl("CurrentThreadsBusy", "count", "Provides the number of request processing threads currently in use in the listener thread pool serving requests");

    protected volatile ThreadPoolConfig threadPoolConfig;
    
    // We need to keep track of the thread pool names for calculating the global values
    protected volatile static List threadPoolNames = Collections.synchronizedList(new ArrayList());
    
    public ThreadPoolStatsProvider(String name) {
        this.name = name;
    }

    @Override
    public Object getStatsObject() {
        return threadPoolConfig;
    }

    @Override
    public void setStatsObject(Object object) {
        if (object instanceof ThreadPoolConfig) {
            threadPoolConfig = (ThreadPoolConfig) object;
            
            // We don't want to add the global thread pool
            if (!threadPoolConfig.getPoolName().equals("")) {
                threadPoolNames.add(threadPoolConfig.getPoolName());
            }
        } else {
            threadPoolConfig = null;
        }
    }

    @ManagedAttribute(id = "maxthreads")
    @Description("Maximum number of threads allowed in the thread pool")
    public CountStatistic getMaxThreadsCount() {
        return maxThreadsCount;
    }

    @ManagedAttribute(id = "corethreads")
    @Description("Core number of threads in the thread pool")
    public CountStatistic getCoreThreadsCount() {
        return coreThreadsCount;
    }

    @ManagedAttribute(id = "totalexecutedtasks")
    @Description("Provides the total number of tasks, which were executed by the thread pool")
    public CountStatistic getTotalExecutedTasksCount() {
        return totalExecutedTasksCount;
    }

    @ManagedAttribute(id = "currentthreadcount")
    @Description("Provides the number of request processing threads currently in the listener thread pool")
    public CountStatistic getCurrentThreadCount() {
        countThreadsInThreadPool();
        return currentThreadCount;
    }

    @ManagedAttribute(id = "currentthreadsbusy")
    @Description("Provides the number of request processing threads currently in use in the listener thread pool serving requests.")
    public CountStatistic getCurrentThreadsBusy() {
        return currentThreadsBusy;
    }

    public CountStatistic getCurrentThreadUsage() {
        long usage = 100 * getCurrentThreadsBusy().getCount() / getCurrentThreadCount().getCount();
        CountStatisticImpl stats = new CountStatisticImpl("CurrentThreadUsage",
                "%", "Percentage of threads currently busy");
        stats.setCount(usage);
        return stats;
    }

    @ProbeListener("glassfish:kernel:thread-pool:setMaxThreadsEvent")
    public void setMaxThreadsEvent(
            @ProbeParam("monitoringId") String monitoringId,
            @ProbeParam("maxNumberOfThreads") int maxNumberOfThreads) {

        if (name.equals(monitoringId)) {
            maxThreadsCount.setCount(maxNumberOfThreads);
        }
    }

    @ProbeListener("glassfish:kernel:thread-pool:setCoreThreadsEvent")
    public void setCoreThreadsEvent(
            @ProbeParam("monitoringId") String monitoringId,
            @ProbeParam("coreNumberOfThreads") int coreNumberOfThreads) {

        if (name.equals(monitoringId)) {
            coreThreadsCount.setCount(coreNumberOfThreads);
        }
    }

    @ProbeListener("glassfish:kernel:thread-pool:threadDispatchedFromPoolEvent")
    public void threadDispatchedFromPoolEvent(
            @ProbeParam("monitoringId") String monitoringId,
            @ProbeParam("threadId") long threadId) {

        if (name.equals(monitoringId)) {
            currentThreadsBusy.increment();
        }
    }

    @ProbeListener("glassfish:kernel:thread-pool:threadReturnedToPoolEvent")
    public void threadReturnedToPoolEvent(
            @ProbeParam("monitoringId") String monitoringId,
            @ProbeParam("threadId") long threadId) {

        if (name.equals(monitoringId)) {
            totalExecutedTasksCount.increment();
            
            if (currentThreadsBusy.getCount() > 0) {
                currentThreadsBusy.decrement();
            }
        }
    }

    @Reset
    public void reset() {
        if (threadPoolConfig != null) {
            maxThreadsCount.setCount(threadPoolConfig.getMaxPoolSize());
            coreThreadsCount.setCount(threadPoolConfig.getCorePoolSize());
            currentThreadCount.setCount(coreThreadsCount.getCount());
            currentThreadsBusy.setCount(0);
        }

        totalExecutedTasksCount.setCount(0);
    }
    
    public void unregisterThreadPool(String name) {
        threadPoolNames.remove(name);
    }
    
    /**
     * Counts the threads in the given thread pool by querying the JVM.
     * @param threadPoolName The name of the thread pool to count the threads of
     */
    private void countThreadsInThreadPool() {     
        // Set to 0 as we want to reset them
        currentThreadCount.setCount(0);
        
        // Get all the threads currently in the JVM
        Set threads = Thread.getAllStackTraces().keySet();
        
        // Count only the threads for this thread pool
        for (Thread thread : threads) {
            String threadName = thread.getName();
            if (thread.isAlive() && threadName.contains(this.name + "(")) {
                currentThreadCount.increment();
            }
        }
    }
}