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From Doug Cutting <>
Subject RE: Indexes in WAR files
Date Thu, 14 Feb 2002 18:00:24 GMT
> From: Les Hughes []
> Reading the servlet spec again it says that calls such as
> servletcontext.getRealPath() will *possibly* return null if 
> the content is
> being served from a war as opposed the physical path on disk 
> - I'm informed
> that weblogic actually returns the name of the warfile and 
> not the exploded
> location. But you're right, Tomcat works differently.

What kind of URL does weblogic return for
Is it a file: URL?

Keeping the index in files and using FSDirectory will be much more
efficient.  If all the major servlet containers support this it would be a
shame not to take advantage of it.  You might look at the result of
getResource and use an FSDirectory if a file: url is returned, and do
something else when it's not.

> So in order to isolate from different interpretations of the 
> spec, I'm going
> to knock up a WARDirectory that probably will wrap a 
> RAMDirectory (going
> back to the servlet container to getResourceAsStream seems 
> awfully expensive
> to me) as a first go.
> I'll post my efforts in a couple of days.

One technique you might consider is, when the index is not available as a
file, use getResourceAsStream to copy it to a temporary directory in
System.getProperty(""), then use FSDirectory.  Storing the
whole index in a RAMDirectory will make searches really fast, but could also
chew up a lot of memory.  If the index isn't that big anyway, maybe this
isn't an issue.


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