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URIResolverExtension and caching [message #116346]

Tue, 05 July 2005 14:02

Axel Hecht

Messages: 16
Registered: July 2009

Junior Member

Hi,

I'm not sure whether this is my weak java foo or if this is actually an
eclipse wtp question. I implement a
org.eclipse.wst.common.uriresolver.internal.provisional.URIR esolverExtension
in my plugin, and I would like to cache some of the computed values.

The values are project specific, so I had some hash for (project, uri)
-> uri. Now my real question is, how do I do that with a sane balance of
performance and memory bloat/leak.

I was thinking about some kind of shared instance like plugin classes
have, but I'm a bit worried how those get teared down again. And is
there a good way to know which hash entries to prune and when?

Yeah, fuzzy description, but it sounds like something that others did a
dozens of times, thus I ask

Thanks

Axel

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Re: URIResolverExtension and caching [message #116455 is a reply to message #116346]

Tue, 05 July 2005 20:29

Lawrence Mandel

Messages: 486
Registered: July 2009

Senior Member

Hi Axel,

The org.eclipse.wst.internet.cache URI resolver does something similar.
You can implement your cache as a singleton (see
http://www.dofactory.com/Patterns/PatternSingleton.aspx) and associate an
expiration time with each entry. In that way you have one instance of your
cache and you can prune dead entires. You can also have your plugin clear
all the entries when your plugin is deactivated or store them for use the
next time Eclipse is run.

Lawrence

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