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

By Ben Nadel

Published 2007-03-14 in ColdFusion — 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>

view raw code-1.cfm hosted with ❤ by GitHub

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"
        
          	/>

view raw code-2.cfm hosted with ❤ by GitHub

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.

Short link: https://bennadel.com/575

Reader Comments

6mm6 Oct 8, 2009 at 11:58 AM

2 Comments

thank you....

Oh my chickens, this post is old!

Hit me up on Twitter if you want to discuss it further.

	<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>

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