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From "Ciramella, EJ" <ECirame...@emptoris.com>
Subject RE: War update = true
Date Wed, 25 Feb 2004 14:25:27 GMT
Ahhh, that makes perfect sense....

Thanks for shedding some light on the subject.

-----Original Message-----
From: Keith Hatton [mailto:khatton@axiomsystems.com]
Sent: Wednesday, February 25, 2004 4:11 AM
To: Ant Users List
Subject: RE: War update = true


-----Original Message-----
>> So when is war/uptodate="true" valuable (or
>> zip/jar/war/ear for that
>> matter)?
>> 
>Ya got me.  ;)  Maybe when you just want to add files
>to an archive and they don't all exist in an
>uncompressed form?  Otherwise, someone might just have
>a preference to update rather than rebuild.  Maybe
>someone else has something more intelligent to say
>about that.

One example of using this that I have worked on recently is a WAR file that
is designed to be incorporated into other applications. The build scripts
for these other applications take a copy of the original WAR from SCM, and
use <war update="true" ...> to customize it, by adding their own web.xml,
JSP files, images, etc., while leaving the core classes and WEB-INF/lib
folder unchanged. (Which is pretty much a concrete example of what you said
above).

I think you'll find update="true" is slower because (a) of the timestamp
comparison Matt originally referred to, and (b) because you can't "replace"
files in a JAR/WAR/EAR - you must create a new archive - so the existing
archive must be unzipped first and a new one built with the correct files.
It's probably best not to regard update="true" as a shortcut, but rather a
way of refining and controlling what happens.

Keith

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