JAMon Data for Java Applications

Recently i used JAMon for gathering important metric in one application which was not j2ee application. For JDK based application how do you get information in absence of JAMon Web Interface. I asked about it to Steve Souza who imeedaitedly returned with answer : MonitorFactory.getData() and MonitorFactory.getHeader(). Based on this data jsmons.jsp is written. For JDK based application i thought we can give same information via JMX. Below is small wrapeer to do

• Register JAmon Factory as MBean and implement some key functions like Attributes and Operations

   JAMonMBean mbean = new JAMon();
   ObjectName name = new ObjectName("jamon.perf:type=JAMonBean");
   MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
   mbs.registerMBean(mbean, name);

• JAMon Client

   ObjectName name = new ObjectName("jamon.perf:type=JAMonBean");
   MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
   String arr[] = {key};
   String[] signature = new String[] { "java.lang.String" };
   obj = mbs.invoke(name,operationName, arr,signature );

• Start background thread to store information in file

   Object[][] data= client.getData();   
   // record format date : label : Hits : Avg : Total : StdDev
   String timestamp = "" + System.currentTimeMillis();
   if(data!=null)
   {
    for(int i=0;i<data.length;i++)
    {
     StringBuilder sb = new StringBuilder();
     sb.append(timestamp).append(" : ");
     sb.append(data[i][0]).append(" : ");
     sb.append(data[i][1]).append(" : ");
     sb.append(data[i][2]).append(" : ");
     sb.append(data[i][3]).append(" : ");
     sb.append(data[i][4]);
     pw.println(sb.toString());
     pw.flush();
     //System.out.println(sb.toString());
    }
   }

Equipped with above, I have also written a small utility which outputs information of all counters periodically in the format

timestamp : label : avg. response time : hits : std. deviation

I have uploaded code used to demonstrate the JAMon Bean have been uploaded at http://tushar.khairnar.googlepages.com/perf-sample.zip.

Please see Sample Program for the same.