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ScopeCache on RIAForge

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Posted in ColdFusion | Posted on 02-28-2008 | 2,362 views

Last night I released ScopeCache on RIAForge. This isn't new code. It's the caching custom tag I've had for a few years now. Charlie Arehart mentioned to me that it wasn't possible to find the code anymore (outside of BlogCFC), so now I have a place for folks to find it.

I also did some small updates to it, including giving it the ability to cache in the request scope.

For folks who don't know what this tag is, it's a basic way to quickly add caching to a page. So imagine the following slow code:

view plain print about
1<cfset sleep(9000)>
2Done sleeping.

I can cache the result of this code (the output) by adding the custom tag:

view plain print about
1<cf_scopecache scope="application" name="mycodeisntslow" timeout="3600">
2<cfset sleep(9000)>
3Done sleeping.
4</cf_scopecache>

Pretty simple, right? There are more options of course. See the documentation in the tag itself.

Comments

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John C. Bland II said on 02-28-2008 at 10:28 AM #
Can I put the cache in the application scope but in my cache struct inside of that scope?

ie - application.cache.mycodeisntslow vs application.mycodeisntslow

Thanks.
Raymond Camden said on 02-28-2008 at 10:31 AM #
John, I read your question twice - and I still don't get it. What are you asking?
Aaron Lynch said on 02-28-2008 at 4:16 PM #
I think he is asking if he can store the cached data in a struct of his own choosing.

In other words, instead of just scope="Application", there could be an optional attribute of structName...


scope="Application" structName="cache"


That is my take on it at least.
Raymond Camden said on 02-28-2008 at 5:28 PM #
Well, if so, the answer is no. ;) You can't dictate _where_ in the scope stuff is cached.
Charlie Arehart said on 03-01-2008 at 2:21 AM #
Thanks for posting it, Ray. I've now updated my pointer to it (along with many other CF-based caching solutions--and several dozen other CF tools) at:

http://www.carehart.org/resourcelists/tools_to_con...
Nate said on 05-22-2008 at 5:56 PM #
I just learned about this custom tag today and it's really helped me out in a big way. Many thanks for this great work of yours. I've got a question. When would you want to use this with the request scope. I can understand how this is used in the application of server scope, but I can't imagine how it's useful in the request scope.
Raymond Camden said on 05-22-2008 at 7:55 PM #
I honestly can't think of a great reason to use the Request scope for the cache, but since it was so easy to add support, I figured what the hey.
Nate said on 06-02-2008 at 11:42 AM #
Can you think of a reason why some code fragments inside a cf_scopecache tag might randomly get repeated when first cached? Clearing the cache seems to correct this problem most of the time.
Raymond Camden said on 06-02-2008 at 1:51 PM #
Yes, I can think of a way. Maybe the tag gets confused and both caches and lets the original output through.

I don't see this here, but if you can try to make a reproducible case, I'd definitely appreciate it.
Nate said on 06-03-2008 at 4:49 PM #
It turns out that my problem had absolutely nothing to do with Scopecache. It was a problem in a SQL query and I was simply confused because I made that change at the same time that I added your Scopecache.


I have a new question for you / feature request.
Let's say Scopecache caches 10000 code fragments and the memory/size of those variables starts taking up too much RAM. Might it be a nice feature to automically clear 2000 or so variables(those variables with the smallest hit count) when that happens?
Raymond Camden said on 06-04-2008 at 8:39 AM #
Yeah, that would be nice. I'd like to have a optimize type action that takes a 'strength' (ie, how much to clean) and the tag will clear out based on hitcount/last used type values.
Nate said on 08-08-2008 at 12:50 PM #
Here's another feature request if you ever find the time for it...

How about a way to save the cache and restore it at a later time after a server is shutdown and restarted? Keeping a history of the cache on a daily or weekly basis would be a very nice feature.
Raymond Camden said on 08-08-2008 at 3:00 PM #
Ah, so basically, cache to the file system. In theory, you could do expires="never" then.

Log a bug request for this at RIAForge. (If I didn't turn it on, bribe me with a beer and I'll do so.)

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