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From "Aaron Mulder (JIRA)" <...@geronimo.apache.org>
Subject [jira] Created: (GERONIMO-849) Be able to add configuration dependencies
Date Wed, 03 Aug 2005 22:19:34 GMT
Be able to add configuration dependencies
-----------------------------------------

         Key: GERONIMO-849
         URL: http://issues.apache.org/jira/browse/GERONIMO-849
     Project: Geronimo
        Type: Improvement
  Components: kernel  
    Versions: 1.0-M4    
    Reporter: Aaron Mulder
     Fix For: 1.0


It would be nice if the code of a GBean could register new dependencies for iteself.  This
could be used for:

 - Tomcat, so you could give it a list of valves and it could make itself depend on them
 - A security realm, so you could give it a list of login modules and it could make itself
depend on them
 - J2EE modules, so when you declare a resource-ref or EJB-ref to a resource/EJB in a separate
app or module then it could make itself depend on that app or module

Note all of these are cases where the current GBean knows precisely which target GBeans it
depends upon -- this does not deal with queries for which an unknown number of GBeans might
match.

The first two cases are currently handled by a, erm, unfortunate workaround whereby the first
GBean depends on the second that depends on a third so each "target" GBean needs a "next"
reference that it doesn't actually need but arranges the dependencies.  It would be nice to
not have to do that.

The third case can't be done right now AFAIK.

I'm imagining some kind of kernel call like addDependency(me, thingIDependUpon) -- where the
method won't return until a dependency has been registered for "my configuration" on "my target's
configuration" and that configuration has been loaded and the target GBean has been loaded.
 The main problem seems to be figuring out what configuration the target GBean is in.  Seems
like this could be determined by parsing the ObjectName of the target.

Perhaps instead of working like standard dependencies, this could be arranged to work via
a helper class where the master GBean just says "helper.load(new String[]{a,b,c})" when the
master is loaded, and "helper.start(new String[]{a,b,c})" when the master is started.

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