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Date: Wed, 02 Jan 2008 16:12:46 -0800
From: Jean-Sebastien Delfino <jsdelfino@apache.org>
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To: tuscany-dev@ws.apache.org
Subject: Re: Using contributions in the tutorial, was: Improving the store
 tutorial module structure
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Rajini Sivaram wrote:
> Sebastien,
> 
> When I was implementing OSGi bundle contributions, I was very frustrated
> about the fact that even though bundles can have cyclic dependencies,
> bundles with cyclic dependencies could not be added to SCA, if the bundles
> contained SCA artifacts (composites/componentType files). OSGi copes with
> cyclic dependencies because bundles have separate install and start methods.
> So classes need to get resolved only before the start method is called. The
> bundle is moved to resolved state by the OSGi runtime when its dependencies
> are satisfied, and only resolved bundles can be started. With SCA
> contributions, when would the composites/componentType files in a
> contribution get processed, if it is not done when the contribution is
> added? Class resolution for contributions is lazy, and hence the ordering of
> contributions is only relevant when there are multiple contributions
> containing the same class. But classes used in SCA composites and
> componentType files get resolved when those files are processed, and at the
> moment addContribution is the trigger, requiring all dependent contributions
> containing classes referred to in composites/componentType files to be
> installed first. If addContribution is not the trigger to process
> composites, I am not sure what the trigger would be. node.start() for the
> node? What about the domain? Wouldn't it have been much simpler if Tuscany
> had a better lifecycle layer (like OSGi :-))?
> 
> 
> 
> Thank you...
> 
> Regards,
> 
> Rajini
> 

Short answer to a long question :) when a composite is assigned to a 
node: node.setComposite(composite).

-- 
Jean-Sebastien

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