Caching

[mschipperheyn]

Hi Edgar,

Saw the Handlebars project you are creating. Good to see this! There was a discussion in the YUI forum on this missing link!
I did a quick review of the code and I was wondering how you are dealing with caching compile templates. I couldn't find this (could be I just missed it) and it would make sense to cache a template after compilation (and do all this in a multi-threaded environment). It would then also make sense to be able to have a method to clear the cache, which is useful in developer and redeploy scenarios.

Great to see this! Let me know if I can help

Marc

[jknack]

Hi Marc,

Welcome to the hanblebars.java project effort. Here is the status of the project:

• It pass 123 of 127 tests from the Mustache spec. The 3 tests are all related to partials and white space indent (minors).
• It support (almost) all the features of Handlebars.js except for: relative path for scope resolution (../scope).
• Right now I'm working on API documentation and checkstyle for code conventions. If you fork/clone handlebars.java now, you'll see a lot of checkstyle errors (which I hope to fix it between today and tomorrow).
• After that I'm planning the first release of handlebars.java (0.1.0)
• Announce the project

About, your comment, handlebars.java is thread safe right now but there is no plan for adding caching yet.
Probably this is a good chance/time to discuss the caching feature.
And of course, you can participate or help in this initial effort :)

Thanks.

edgar

[mschipperheyn]

Great Edgar,

Regarding the caching, perhaps the way Freemarker handles this could be an inspiration
https://github.com/freemarker/freemarker/blob/master/src/main/java/freemarker/template/Configuration.java
They offer some sensible aspects on this:

• A standard, configurable refresh delay with a default
• All compilations are cached at least on a per request level (I think)
• Manual clear cache option (clearTemplateCache method)

But reviewing this, they wrote a completely customized cache storage, that could probably be served more easily and efficiently by ehcache.

[jknack]

Hi Marc,

Now, you can provide a TemplateCache implementation. There is a simply implementation called: ConcurrentMapTemplateCache. At the moment, I'm not going to add anything more complex than that.

Anyway, you can provide a cache implementation built on top of eh-cache, google-guava, etc.

Hope this helps!

Thanks