Improve performance for page rendering by refactoring freemarker cache
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Key: WW-3467
URL: https://issues.apache.org/jira/browse/WW-3467
Project: Struts 2
Issue Type: Improvement
Affects Versions: 2.1.8.1, 2.1.8, 2.1.6, 2.1.5
Reporter: zhouyanming
Priority: Blocker
Attachments: patch.txt
currently,struts2 have two inconsistent options about freemarker cache
1.<constant name="struts.freemarker.mru.max.strong.size" value="250" />
this option will used by freemarker.cache.MruCacheStorage
2.<constant name="struts.freemarker.templatesCache" value="true" />
this option will use a internal ConcurrentHashMap in FreemarkerTemplateEngine
but not freemarker native cache
my patch deprecated this option and clean those code
also add a option to change default update cache interval (5 seconds)
<constant name="struts.freemarker.templatesCache.updateDelay" value="1800" />
BTW:set devMode to true will disable cache and update immediately
using cache will boost great performance, reduce 400ms to 20ms render a xhtml
theme form and some textfield in my test .
I think https://issues.apache.org/jira/browse/WW-2808 could closed by adding a
wiki page about how to use freemarker cache
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