RE: [picocontainer-dev] JMX / JNDI and exposing

--- Jörg Schaible <[email protected]>
wrote:

> Hi Konstantin,
> 
> Konstantin Priblouda wrote on Wednesday, August 22,
> 2007 11:23 AM:
> 
> > Hi all,
> > 
> > It seems to me that current approach to exposing
> > components to JNDI / JMX is bit of suboptimal.
> > 
> > Currently JMX/JNDI behaviours would expose
> component
> > on getComponentInstance() ( and if they are
> upstack
> > from caching, on every getComponentInstance() ) ,
> and
> > there is also visitors which poke adapters to
> force
> > exposition.
> > 
> > However, biggest problem for those adapters is
> that
> > they need additional data, which is difficult to
> > provide in scripting environment.
> > ( JMXExposed requires MBean server, which may be
> > unavailable  to the moment of script parsing. Not
> to
> > speak about passing it to xml / beanshell script
> in
> > builder )
> > 
> > I would propose to move all the exposing
> functionality
> > to visitors.
> > 
> > Advantages:
> >  - simplier scripts, no headaches about initial
> > context
> > or mbean servers there.
> >  - explicit control when something is exposed.
> > 
> > Disadvantages:
> >  - need of explicit call to visitor after
> container
> > creation ( but it is also current state )
> > 
> > regards,
> > (
> 
> All this was resolved in the old JMX impl, so I am
> simply wondering about this questions!
> 
> - Jörg

Not quite. Current implementation of JMXExposed
requires MBeanServer & array of mbean providers. 
And those are not so easy to obtain in a script. 

(ContainerDeployer receives MBeanServer during its
initalisation, but there is no generic way to pass it 
to underlying script)

The same happens with JNDIExposed - it requires
initial context to construct reference (but in most
cases default one will be sufficient) 

As for lifecycle, components are exposed automatically
upon retrieval from container ( could happen while
starting )  - so more control over this  would be also
fine.  And this can be achieved easily with  visitor. 


regards,

----[ Konstantin Pribluda http://www.pribluda.de ]----------------
JTec quality components: http://www.pribluda.de/projects/


       
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