com.viaoa.process.OAThreadMonitor Maven / Gradle / Ivy

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package com.viaoa.process;

import java.lang.management.ManagementFactory;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import com.sun.management.OperatingSystemMXBean;

import com.viaoa.util.OAString;

/**
 * used to monitor running threads and look for any alerts.
 * 20180410 under dev
 * @author vvia
 *
 */
public class OAThreadMonitor {
    protected final HashMap hmThreadInfo = new HashMap<>();

    static class ThreadInfo {
        Thread thread;
        long tsCreated;
        StackTraceElement[] stes;
    }

    public void checkThreadDump() throws Exception {
        long tsNow = System.currentTimeMillis();
        Map map = Thread.getAllStackTraces();
        Iterator it = map.entrySet().iterator();

        for (int i = 1; it.hasNext(); i++) {
            Map.Entry me = (Map.Entry) it.next();
            Thread t = (Thread) me.getKey();
            StackTraceElement[] stes = (StackTraceElement[]) me.getValue();

            System.out.println(t.getName());

            ThreadInfo ti = hmThreadInfo.get(t);
            if (ti == null) {
                ti = new ThreadInfo();
                hmThreadInfo.put(t, ti);
                ti.stes = stes;
                continue;
            }

            for (StackTraceElement ste : stes) {
                int xx = 4;
                xx++;
            }
        }
    }

    public static void main(String[] args) throws Exception {
/*        
        OperatingSystemMXBean osBean = ManagementFactory.getPlatformMXBean(OperatingSystemMXBean.class);
        // What % CPU load this current JVM is taking, from 0.0-1.0
        double d = osBean.getProcessCpuLoad();
        double d2 = osBean.getSystemCpuLoad();
*/        
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                for ( ;;) {
                    Math.random();
                }
            }
        });
        // t.start();
        
        OAThreadMonitor tm = new OAThreadMonitor();
        for (;;) {
            tm.checkThreadDump();
            Thread.sleep(1000);
        }
    }

}