CODEWITHSUNDEEP
coldfusioncoldfusion-10application.cfc
user778574
user778574

Reputation: 53

ColdFusion 10 application.cfc error: counting number of active sessions

In the adobe coldfusion 10 documentation, Defining the application and its event handlers in Application.cfc, there is a sample Application.cfc containing the function below. After looking at the code, I am wondering if there is a typo/bug in the following code:

<cffunction name="onSessionStart"> 
    ...
    <cflock timeout="5" throwontimeout="No" type="EXCLUSIVE" scope="SESSION"> 
        <cfset Application.sessions = Application.sessions + 1> 
    </cflock> 
    ...
</cffunction>

Should it be:

?

If it is (A) then I am confused. Can someone explain why?

Upvotes: 3

Views: 365

Answers (2)

Adam Cameron
Adam Cameron

Reputation: 29870

This is a duplicate of my answer to the same question asked on the Adobe forums:

Don't be confused... it's an error in the docs. You could do Adobe a favour by commenting at the bottom of the page: they do monitor those comments (they don't always react, but the do monitor them).
onSessionStart() is intrinsically single-threaded as far as the session scope goes: it's only ever run once per session (when the session starts...). On the other hand the code in question def wants to single-thread access to that application-scoped variable as we don't want two simultaneous sessions hitting it for any given single value of it (if that makes sense).

Upvotes: 1

BKK
BKK

Reputation: 2073

You always lock the SCOPE that you are writing to. In this case it would be APPLICATION.

Upvotes: 0

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