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Ben Nadel at CFUNITED 2009 (Lansdowne, VA) with: Patrick McGraw
Ben Nadel at CFUNITED 2009 (Lansdowne, VA) with: Patrick McGraw ( @norasdaddy )

What Happens When I Cache Application.cfc Within The APPLICATION Scope?

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Published in Comments (1)

Pretty much nothing exciting :) But I wanted to try it to see if stuff would blow up. If nothing else, it proves that a new Application.cfc instance is created for every single page request. This test is super, ultra simple. Here is my Application.cfc ColdFusion component:

<cfcomponent>

	<cfset THIS.Name = "App Cache Test" />
	<cfset THIS.ApplicationTimeout = CreateTimeSpan( 0, 0, 5, 0 ) />

	<!---
		Here, I am creating a unique ID for this Application.cfc
		just to help see if one instance is the same as another.
	--->
	<cfset THIS.ID = CreateUUID() />

	<cffunction
		name="OnRequestStart"
		access="public"
		returntype="boolean"
		output="false">

		<!---
			Param an array in the APPLICATION scope to hold all
			of our App.cfc instances.
		--->
		<cfparam
			name="APPLICATION.Apps"
			type="array"
			default="#ArrayNew( 1 )#"
			/>

		<!---
			Append THIS application.cfc instance to our
			cached array.
		--->
		<cfset ArrayAppend(
			APPLICATION.Apps,
			THIS
			) />

		<cfreturn true />
	</cffunction>

</cfcomponent>

Then, my index.cfm page merely CFDumps out the APPLICATION scope:

<!---
	Dump out the APPLICATION scope. Put in a TOP 10 to
	make sure nothing goes crazy.
--->
<cfdump
	var="#APPLICATION#"
	top="10"
	/>

After running that page a few times, here is what I get:

Application.cfc Caching In APPLICATION Scope

As you can see, nothing exciting going on here. At least it didn't go kabooom!

Want to use code from this post? Check out the license.

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Ben Nadel