Is there an ehcache jsp tag?

In a current project of mine, JSPs are getting huge (lots of jstl end el logic, no Java), and due to increasing traffic, caching on many levels has become a necessity. Some components need to be dynamic, so we won't be able to use filter-based solutions. Unfortunately, the logic uses many custom tags and hardly ever uses includes, so SimplePageFragmentCachingFilter won't help either.

What I am looking for is something like this:

<ehcache:cache key="${myApp.cacheKey}">
    <many />
    <jsp />
    <tags />
    <here />
</ehcache:cache>

This tag would expose a virtual writer for pageContext.out and flush that writer to the cache and the page and on subsequent requests would write directly from the cache 开发者_StackOverflowto pageContext.out.

Does any such beast exist?

Hint: I know we should change the design, reduce logic in JSPs etc. Unfortunately, it won't happen. I'm not the one making decisions here, so please don't go there. Oh, and: yes, I have googled it.

There existed two tag libraries for this: Jakarta Cache and OpenSymphony OSCache. Both are retied and the Jakarta Cache library is nowhere available for download, but you can still download the OSCache library here: OSCache 2.4.

It's supposed to be used as follows (after you just drop the JAR in /WEB-INF/lib the usual way):

<%@taglib prefix="oscache" uri="http://www.opensymphony.com/oscache" %>
...
<oscache:cache key="${myApp.cacheKey}">
    <many />
    <jsp />
    <tags />
    <here />
</oscache:cache>

I made such a thing: https://github.com/psiegman/ehcachetag

Haven't used it on a production system yet, but it has decent code coverage.

I believe the answer is no, such a beast does not exist.

There's an enhancement request open for this http://jira.terracotta.org/jira/browse/CDV-1617 I recommend voting for it.