9 Writing and Running JavaScript Clients to Monitor GlassFish Server

Example 9-8 Counting the Number of Loaded JSP Technology Pages

This example uses the glassfish:web:jsp:jspLoadedEvent event to count the number of JavaServer Pages (JSP) technology pages that GlassFish Server has loaded.

var njspLoaded=0;

function jspLoaded(hostName) {
    njspLoaded = njspLoaded + 1;
    client.print( '\n js> jsp loaded event called on ' +
            'host = ' + hostName +
            ' and count = ' + njspLoaded);
}

params = java.lang.reflect.Array.newInstance(java.lang.String, 1);
params[0]="hostName";

scriptContainer.registerListener('glassfish:web:jsp:jspLoadedEvent', 
    params, 'jspLoaded');

This script can be run with a command similar to the following:

asadmin run-script jsp-loaded-count.js

Information similar to the following is displayed each time that GlassFish Server loads a JSP technology page:

js> jsp loaded event called on host = server and count = 1

The script runs until a user types Ctrl-C to stop the script.

Example 9-9 Measuring the Time to Process Web Service Requests

This example uses the following events to measure the time to process web service requests:

• glassfish:web:http-service:requestStartEvent

• glassfish:web:http-service:requestEndEvent

The script also displays the information that is contained in the parameters of these events.

// http request related probes

// glassfish:web:http-service:requestStartEvent requestStartEvent(
// java.lang.String appName,
// java.lang.String hostName,
// java.lang.String serverName,
// int serverPort,
// java.lang.String contextPath,
// java.lang.String servletPath)


request_params = java.lang.reflect.Array.newInstance(java.lang.String, 6);
request_params[0]="appName";
request_params[1]="hostName";
request_params[2]="serverName";
request_params[3]="serverPort";
request_params[4]="contextPath";
request_params[5]="servletPath";

var startTime;
var object = new Object();
var nrequestStartEvent=0;

function requestStartEvent(appName,hostName,serverName,serverPort,contextPath,
    servletPath){

    nrequestStartEvent=nrequestStartEvent+1;
        startTime = (new Date()).getTime();
    //insert the request time in Map
        key = java.lang.Thread.currentThread().getId();
        object[key] = startTime;

        client.print(
            'Count: '+ nrequestStartEvent +'\n'+ 
            'Event: glassfish:web:http-service:requestStartEvent' +'\n'+ 
            'Application: '+appName+'\n'+ 
            'Host: ' + hostName +'\n'+ 
            'Server: ' + serverName +'\n'+ 
            'HTTP Port: ' + serverPort +'\n'+ 
            'Context Path: ' + contextPath +'\n'+ 
            'Servlet Path: ' + servletPath + '\n' + 
            'Current Thread: ' + java.lang.Thread.currentThread().getId() + 
        '\n\n');
}

scriptContainer.registerListener('glassfish:web:http-service:requestStartEvent',
    request_params , 'requestStartEvent');

// glassfish:web:http-service:requestEndEvent requestEndEvent(
// java.lang.String appName,
// java.lang.String hostName,
// java.lang.String serverName,
// int server Port,
// java.lang.String contextPath,
// java.lang.String servletPath,
// int statusCode)

request1_params = java.lang.reflect.Array.newInstance(java.lang.String, 7);
request1_params[0]="appName";
request1_params[1]="hostName";
request1_params[2]="serverName";
request1_params[3]="serverPort";
request1_params[4]="contextPath";
request1_params[5]="servletPath";
request1_params[6]="statusCode";


var nrequestEndEvent=0;

function requestEndEvent(appName,hostName,serverName,serverPort,contextPath,
    servletPath,statusCode){

    nrequestEndEvent=nrequestEndEvent+1;
        key = java.lang.Thread.currentThread().getId();
        startTime = object[key];
        if (startTime == null)
            client.print("Error getting the startTime for thread = " + key);
        else
            delete[key];
        totalTime = (new Date()).getTime() - startTime;

        client.print(
            'Time Taken: ' + ((new Date()).getTime()-startTime) + ' ms\n' + 
            'Count: '+nrequestEndEvent+'\n'+ 
            'Event: glassfish:web:http-service:requestEndEvent' +'\n'+ 
            'Application: '+appName+'\n'+ 
            'Host: ' + hostName +'\n'+ 
            'Server: ' + serverName +'\n'+ 
            'HTTP Port: ' + serverPort +'\n'+ 
            'Context Path: ' + contextPath +'\n'+ 
            'Servlet Path: ' + servletPath +'\n'+ 
            'Status Code: ' + statusCode + '\n' + 
            'Current Thread: ' + java.lang.Thread.currentThread().getId() + '\n' + 
         '\n\n');
}
scriptContainer.registerListener('glassfish:web:http-service:requestEndEvent', 
    request1_params, 'requestEndEvent');

This script can be run with a command similar to the following:

asadmin run-script web-service-request-timer.js

Information similar to the following is displayed each time that a web service request is initiated:

Count: 2
Event: glassfish:web:http-service:requestStartEvent
Application: __admingui
Host: __asadmin
Server: localhost
HTTP Port: 4848
Context Path: 
Servlet Path: /common/commonTask.jsf
Current Thread: 98

Information similar to the following is displayed each time that a web service request is completed:

Time Taken: 1704 ms
Count: 2
Event: glassfish:web:http-service:requestEndEvent
Application: __admingui
Host: __asadmin
Server: localhost
HTTP Port: 4848
Context Path: 
Servlet Path: /common/commonTask.jsf
Status Code: 200
Current Thread: 98

The script runs until a user types Ctrl-C to stop the script.