Implement a cache in AbstractTearOff even when MetaClass.NO_CACHE is set #184
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jglick
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jeffret-b
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Jun 10, 2020
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Looks good. It should perform handy caching for those development situations, to speed things up nicely.
It's a reasonable adjustment to the NO_CACHE behavior. It still meets the necessary behavior of that flag, but provides a simple, but helpful cache to speed things up.
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Implements my proposal from jenkinsci/maven-hpi-plugin#40 (comment). Jenkins in development mode—
hpi:run,jetty:run,surefire:test—setsMetaClass.NO_CACHEflag. (Usually via the system propertystapler.jelly.noCache, though in fact it affects Groovy views too.) This flag ensures that changes to source files are applied on every new page load, which is good, but also forces every*.jellyor*.groovyfile to be reparsed whenever accessed—in some cases multiple times in a single HTTP response! That adds a lot of CPU overhead and contributes to page loads being noticeably slower than in production.This patch retains most of the
NO_CACHEbehavior (it is interpreted in a number of places), but caches parsed/compiled views if they have not actually been changed on disk. There is still a bit of overhead to check file timestamps but things feel quite a bit snappier duringhpi:run, especially on a form-heavy page like/configure.