Hi,
I'm trying to work out a way to cache binary image data in an application
scoped CFC and output it directly to the output stream without needing to
hit the hard disk at all. The objective is to tweak all the performance i
can get out of a server.
Here's what i've got so far:
--
ImageCache.cfc ------------------------------------------------------------
<cfcomponent displayname="ImageCache">
<cffunction name="init" access="public" returntype="ImageCache"
output="false">
<cfargument name="imagePaths" required="Yes" type="string"
hint="Comma
delimited list of fully qualified paths to directories with images to cache
in memory" />
<cfset variables.imagePaths = listToArray(arguments.imagePaths)
/>
<cfset cacheImageData() />
<cfreturn this />
</cffunction>
<cffunction name="cacheImageData" access="private" returntype="void"
output="false">
<cfset var imagePath = "" />
<cfset var imageNames = "" />
<cfset var imageKey= "" />
<cfset var binImage = 0 />
<cfloop from="1" to="#arrayLen(variables.imagePaths)#"
index="i">
<cfdirectory action="LIST"
directory="#variables.imagePaths[i]#"
name="imageNames" />
<cfloop query="imageNames">
<cfif
ListContains("gif,jpg,jpeg,png,bmp",ListLast(imageNames.name,
"."))>
<cffile action="readBinary"
file="#variables.imagePaths[i]##imageNames.name#" variable="binImage">
<cfset imageKey =
Replace(imageNames.name, ".","","all") />
<cfset variables[imageKey]['data'] =
binImage />
<cfset variables[imageKey]['type'] =
ListLast(imageNames.name, ".") />
</cfif>
</cfloop>
</cfloop>
</cffunction>
<cffunction name="getImage" access="public" returntype="any"
output="false">
<cfargument name="imageName" required="Yes" type="string" />
<cfset var imageKey = Replace(arguments.imageName,
".","","all") />
<cfset var image = "missing" />
<cfif StructKeyExists(variables,imageKey)>
<cfsavecontent variable="image">
<cfcontent
type="image/#variables[imageKey]['type']#" reset="No"
variable="#variables[imageKey]['data']#">
</cfsavecontent>
</cfif>
<cfreturn image />
</cffunction>
</cfcomponent>
----------------------------------------------------------------------------
-- imageCacheTest.cfm --
<cfif NOT StructKeyExists(application, "ImageCache") OR StructKeyExists(url,
"reset")>
<cfset currentDirectory = GetDirectoryFromPath(GetTemplatePath())>
<cfset application.ImageCache =
createObject('component','ImageCache').init(currentDirectory)>
</cfif>
<cfoutput>
Other content???
#application.ImageCache.getImage('adminGreen.gif')#
</cfoutput>
----------------------------------------------------------------------------
What's happening is that the cfcontent tag in the CFC is preventing any
other content from being displayed on imageCacheTest.cfm
I do have something working, but it involves introducing a small hit to the
hard disk like so.
-- image.cfm ---------------------------------------------------------------
<cfoutput>
#application.ImageCache.getImage(url.image)#
</cfoutput>
----------------------------------------------------------------------------
-- imageCacheTest2.cfm ----------------------------------------------------
<cfif NOT StructKeyExists(application, "ImageCache") OR StructKeyExists(url,
"reset")>
<cfset currentDirectory = GetDirectoryFromPath(GetTemplatePath())>
<cfset application.ImageCache =
createObject('component','ImageCache').init(currentDirectory)>
</cfif>
Other content???
<img src="image.cfm?image=arrows_small.gif" alt="" border="0" />
----------------------------------------------------------------------------
My thinking is that this may help under load, because it minimizes the hit
to the hard disk, but i'd like to eliminate it completely.
Anyone have any suggestions?
thanks,
Nando
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