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From "Gianny Damour (JIRA)" <...@geronimo.apache.org>
Subject [jira] Created: (GERONIMO-1638) Multiple servers sharing the same repo and config store
Date Sun, 19 Feb 2006 01:40:25 GMT
Multiple servers sharing the same repo and config store
-------------------------------------------------------

         Key: GERONIMO-1638
         URL: http://issues.apache.org/jira/browse/GERONIMO-1638
     Project: Geronimo
        Type: New Feature
  Components: usability  
    Versions: 1.0    
    Reporter: Gianny Damour
 Assigned to: Gianny Damour 
     Fix For: 1.1


David J. sent to the dev mailing list:

Many people have talked on and off about how to set up multiple  servers sharing the same
repository and config-store, but we haven't  arrived at an agreed on way to do it.  We have
a prospective customer  for this feature (Vincent Massol with Cargo) so I'd like to move 
beyond thinking about it in my head, discuss it, and have someone  implement it.  I believe
any implementation will be more or less  trivial, the hard part is figuring out what to do.

I've only thought of ways to extend what we have now, rather than  restructure anything or
add big new capabilities.  If someone sees a  better way, please speak up.

So, we have a ServerInfo gbean that knows where geronimo is located  and can resolve absolute
locations for other components.  Then we  have things like the repository and config store
gbeans that  typically are "located" outside the var dir and things like the  logging framework,
 local attribute manager, derby, and tomcat, that  typically keep stuff in the var directory.

All or most of these start with the first configuration loaded so  they can't have any attributes
overridden by config.xml: in fact this  file is read by one of the gbeans that we need to
"relocate".

I've thought of two related solutions.  Both of them involve giving  ServerInfo knowledge
of another path and another resolve method.

One would be something like "resolveVar" and would normally resolve  to geronimo_home/var.
 This would involve all the gbeans currently  looking inside var having the "var" trimmed
off the front of their  paths and using the new resolveVar method.  In this case we'd have
 different servers represented as e.g.
var1
var2
var3
...


The other would give ServerInfo something like resolveServer which  would normally resolve
to geronimo_home.  The gbeans looking inside  var would keep their current paths and just
call the new resolve  method instead of the old one.  In this case we'd have servers like
var
server1/var
server2/var
...

In either case I think starting geronimo with a command line argument  pointing to the var
directory is the only way to specify which server  you want to run; the default would presumably
be as now "var".

Several people have suggested putting an additional config-store into  var for "private" use
by a particular server.  At the moment I think   that providing a different config-store class
that uses the new  resolve  method on server info would be the best way to do this.


I'm not attached to these ideas but this is as far as my thinking has  gone.  Please comment.

thanks
david jencks


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