So, a while back, I wrote a CF_Accelerate-like tag (before I knew of
that one) and this one cached to file, memory, or cached query objects.
I think my locking is too aggressive, and is hurting performance. I
stripped down the tag below for readability...
Can you please advise me whether I can change this around in any way to
help performance? (Downgrade any cflocks from exclusive to readonly?
Maybe eliminate some locking?)
Also, which of CFFILE+Read vs. getPageContext.include() is more costly
for outputting the cached file content?
For file-basedc caching, I write to [filename]_tmp, and then move it to
[filename] on the first read. I was worried about clashes...
Any tips would be helpful...
Thanks!
-----------------------------------
<Cfparam name="attributes.mode" default="File|Memory|Query">
<Cfparam name="attributes.key">
<Cfparam name="attributes.expires">
<Cfparam name="attributes.clearcache" default="false">
<cfparam name="application.contentcache" default="#Structnew()#">
<cfparam name="application.memorycachetagoutput"
default="#Structnew()#">
<cfparam name="application.mainquerycache" default="#Structnew()#">
<cfif thistag.executionmode is "Start">
<cfif NOT attributes.clearcache
AND
structkeyexists(application.contentcache,attributes.key)
AND
abs(datediff('n',structfind(Application.contentcache,attributes.key),now
())) LT attributes.expires>
<!--- CACHE HIT! --->
<cflock timeout="15" type="exclusive"
name="CacheTagOutput_#attributes.key#">
<Cfif attributes.mode is "File">
<cfif fileexists(filename &"_tmp")>
<Cfif fileexists(filename)><cffile
action="delete" file="#filename#" ></cfif>
<cffile action="rename" source="#filename#_tmp"
destination="#filename#">
</cfif>
<!--- used to be CFFILE reading --->
<Cfset
getPageContext().include("#attributes.pagepath#partial_tag_cache/#attrib
utes.key#.cache")>
<cfelseif attributes.mode is "memory">
<Cfoutput>#structfind(Application.memorycachetagoutput,attributes.key)#<
/cfoutput>
<cfelseif attributes.mode is "query">
<Cfoutput><Cfset
"caller.#attributes.queryname#"=#structfind(Application.mainquerycache,a
ttributes.key)#></cfoutput>
</cfif>
<cfexit>
</cflock>
</cfif>
<cfelseif thistag.executionmode is "End">
<!--- CACHE MISS (wouldn't have made it this far if a
hit) --->
<!--- Insert Content --->
<cflock timeout="10" type="exclusive"
name="CacheTagOutput_#attributes.key#">
<Cfif attributes.mode is "file">
<cffile action="WRITE" file="#filename#_tmp"
output="#thistag.generatedcontent#" addnewline="No">
<cfelseif attributes.mode is "memory">
<cfset
structinsert(Application.memorycachetagoutput,attributes.key,"#thistag.g
eneratedcontent#",true)>
<cfelseif attributes.mode is "query">
<Cfquery dbtype="query"
name="cachedQuery">select * From caller.#attributes.queryname#
</cfquery>
<cfset
structinsert(Application.mainquerycache,attributes.key,cachedQuery,true)
>
</cfif>
<!--- UPDATE TIMESTAMP OF KEY --->
<cfset
structinsert(Application.cachetagoutput,attributes.key,now(),true)>
</cflock>
</cfif>
</cfif>
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