Hi Venkat I think that definitions.xml can be provided to Tuscany in two ways. Either in a contribution or in an extension library. I also think that the contents of definitions.xml files provided in either of these ways should be added to the domain wide pool of intents and policy sets and should be applied to composites in the domain as appropriate.
Is this correct? I think at the moment the code only treats the definitions.xml added with extensions as being of domain scope. Definitions.xml added within a contribution are only processed in the context of that contribution Is my reading of the code correct? If I'm correct on these two points we need to fix the case where the definitions.xml file comes within a contribution. I think this is independent of whether a node running a composite is remote or not as a node may require multiple contributions in order to support a single composite, as you scenario suggests. I've put some comments in line. Simon [1] http://svn.apache.org/repos/asf/incubator/tuscany/java/sca/modules/workspace-admin/src/main/java/org/apache/tuscany/sca/workspace/admin/impl/DeployableCompositeCollectionImpl.java On Wed, Mar 19, 2008 at 10:11 AM, Venkata Krishnan <[EMAIL PROTECTED]> wrote: > Hi, > > I am trying to run the bigbank sample from a distirbution and postulating > a > multiple contirbutions situation as follow : > > Let contribution CA and contribution CB each have their definitions.xmlthat > defines some policysets. Now, can the composites defined in CB be able to > use the policysets defined in CA ? I think they should be able to . > > If so, is there a discipline that needs to be followed in the order of > adding these contributions i.e. should CA be added first and then CB ? > The code is like this at the moment when it comes to running a composite, i.e. the contributions have to be added in the right order, but it would be good if that were not the case. More importantly the implication is that we need to load ALL of the contributions that are required before any composites are processed. > In a distributed runtime, where CA and CB are added and deployed on two > different nodes, would the node that has CB should try to pull down parts > (just the defintions.xml) or whole of CA ? It might need other things from CA so I would suggest that the whole of CA is given to the node. > > Finally, if definitions are going to be applicable to an entire domain, > which I believe should be case, then how do we ensure that all > definitions.xml contributed are first read and processed before composites > are read and processed and how do we make this consolidate / aggregated > definitions available to all nodes in the domain ? I think we have to look at the ideas in the workspace. Here all of the contributions are expected to be available before any nodes start running composites. I put some code into the workspace code to calculate the URI of all service bindings before any nodes run [1], take a look at the doGet() method. To work this relies on reading all of the contributions required to run the configured domain. This would seem to be a good point at which to pull all definitions.xml files out of all contributions and aggregate the policy sets before individual composites are processed. > > Thanks > > - Venkat >
