How to count the active sessions in CF
After my success playing around with the underlying java that handles the application scope I was inspired to try the same on the session scope.
Get current sessions
One of the most commonly requested stats a site owner wishes to know is how many people are on their site at a moment in time. Coldfusion doesn't give an inbuilt way to get this information, but a bit of hacking in the cfusion jar file and introspection of the objects gives us what we need.
<cffunction name="getSessionCount" returntype="numeric" output="false">
<cfset var oSession = createObject("java","coldfusion.runtime.SessionTracker")>
<cfreturn oSession.getSessionCount()>
</cffunction>
<cfset var oSession = createObject("java","coldfusion.runtime.SessionTracker")>
<cfreturn oSession.getSessionCount()>
</cffunction>
Get current sessions per application
But then we may have a number of applications running on our site - and we want to see what the breakdown of activity is among each of our applications.
<cffunction name="getApplicationSessionCount" returntype="numeric" output="false">
<cfargument name="appName" type="string" required="true">
<cfscript>
var oSession = createObject("java","coldfusion.runtime.SessionTracker");
var mySessions= oSession.getSessionCollection(arguments.appName);
return StructCount(mySessions);
</cfscript>
</cffunction>
<cfargument name="appName" type="string" required="true">
<cfscript>
var oSession = createObject("java","coldfusion.runtime.SessionTracker");
var mySessions= oSession.getSessionCollection(arguments.appName);
return StructCount(mySessions);
</cfscript>
</cffunction>
By passing in the application name this will return the number of sessions for a particular application. Neato.
If you link this code up with the the Application scope hackery you can create a nice table of session counts for all you applications.
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