RE: [cross-project-issues-dev] Update Site improvements for Calli sto

[Andrew Niefer <aniefer@xxxxxxxxxx>]

The update site will contain both the
jars and the jar.pack.gz files, so clients running 1.4 without the unpack200
executable will just download the jar files as normal.

-Andrew

Jeff McAffer/Ottawa/IBM@IBMCA
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04/24/2006 10:13 PM

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Subject	RE: [cross-project-issues-dev] Update Site improvements for Calli sto

The update client looks for the unpack200 executable in a number of places
(including in the JRE, on the path and in a special var).  If it is
available, Update and hte update site being used supports pack200 content,
the client will attempt to fetch .pack.gz files.  This way people
running 1.4 (whatever) are still able to take advantage of  the new
technology. 

I updated the Update Site Optmization wiki page with some info on this.
 No doubt Andrew will have something to add/clarify.

Jeff

Doug Schaefer <DSchaefer@xxxxxxx>
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04/24/2006 09:18 PM

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Subject	RE: [cross-project-issues-dev] Update Site improvements for Calli sto

Since Pack200 is in J2SE 5.0, does that you won’t be able to download
Callisto with Java 1.4? 
  
Doug Schaefer, QNX Software Systems 
Eclipse CDT Project Lead, Tools PMC member 
http://cdtdoug.blogspot.com

---

From: cross-project-issues-dev-bounces@xxxxxxxxxxx [mailto:cross-project-issues-dev-bounces@xxxxxxxxxxx]
On Behalf Of Andrew Niefer
Sent: Monday, April 24, 2006 5:27 PM
To: cross-project-issues-dev@xxxxxxxxxxx
Subject: [cross-project-issues-dev] Update Site improvements for Callisto
  

Starting in RC2 (or nightly build N20060423-0010) org.eclipse.update.core
will have support for optimizing update sites.  This support takes
the form of digests and Pack200. 

Pack200 is a jar compression utility in J2SE 5.0, using it can reduce the
size of a jar by about 60% depending on its contents.  However, Pack200
makes non-semantic changes to the class files.  To ensure that the
bits downloaded from a packed update site are the same bits the you get
from a normal zip distribution, project should condition their jars as
part of their build process.

I have put together 2 wiki pages to cover this issue: http://wiki.eclipse.org/index.php/Update_Site_Optimization
and http://wiki.eclipse.org/index.php/Pack200.

Projects should please take a look and send me any feedback or questions
you may have. 

-Andrew 


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