CFLOCK

[iccsi]

I just wanted to know when I need use CFLOCK.

For example, do I need to CFLOCK when I assign my data source database in my Application.cfc.

If I use CFLOCK then web server will lock the database for timeout seconds to connect the database server?

Your information and help is great appreciated,

Regards,

Iccsi,

[Adam Cameron. · Accepted solution]

You need to lock when there will be a race condition, that's about it. http://en.wikipedia.org/wiki/Race_condition#Example

onApplicationStart() is single threaded when it's called as part of the application lifecycle (http://adamcameroncoldfusion.blogspot.co.nz/2012/07/onapplicationstart-is-not-intrinsically.html), so there's no need to worry about locking application-scoped stuff in there.

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Adam

[iccsi]

Thanks a million for the information and help.

I see onApplicationStart even in the file.

Must I put this event within cfcomponent?

Should this event only can have once and in Application.cfc, since it trigger on application start.

Thanks again for a million for helping and information,

Regards,

Iccsi,

[Adam Cameron.]

onApplicationStart() must be in a CFC, yes - specifically Application.cfc as you say. One can only have one method of a given name in a CFC, and Application.cfc is no different in this regard, so only one onApplicationStart() method, yes. I think that's what you're asking.

However one can use inheritance with Application.cfcs just like with any other CFC, so one can have this:

/mainapp/Application.cfc

/mainapp/subsection/Application.cfc - extends /mainapp/Application.cfc.

This means one can implement your general-case event handlers in /mainapp/Application.cfc, and if the subsection requires different behaviour, then the Application.cfc there can override the event handlers as required. Plus they can call the extended Application.cfc's event handlers too, via - for example - super.onApplicationStart().

It's all well documented:

Application.cfc reference:

http://help.adobe.com/en_US/ColdFusion/10.0/CFMLRef/WSc3ff6d0ea77859461172e0811cbec22c24-74fa.html

Defining the application and its event handlers in Application.cfc

http://help.adobe.com/en_US/ColdFusion/10.0/Developing/WSc3ff6d0ea77859461172e0811cbec22c24-7d39.htm...

And also google for "application.cfc". Plenty of people have blogged about it.

HTH.

--

Adam

[iccsi]

Thanks a million for helping and information,

Regards,

Iccsi,