Kevin Williams wrote:
I am interested in extending the current locate service capability to
support the location of services that may be running within the same
domain but a separate jvm. The most straightforward approach may be
to dynamically create and return a service reference using the same
Tuscany runtime elements that now create service references for
injection in support of the @reference annotation.
Any thoughts or pointers would be appreciated.
Thanks,
--Kevin
This sounds good to me. I guess you're talking about
SCADomain.getService(targetComponentName/targetServiceName). We've been
flip-flopping between locateService/getService a few times :) ... Here
are a few more thoughts.
First here's how SCADomain.getService() currently works:
1. look for the target component model object in the in-memory domain
composite kept in SCADomain
2. look for the target service on that component
3. find on that component the self-reference created for that service
(these self-references are automatically created by CompositeBuilder for
each service provided by a component)
4. create a CallableReference for that self-reference
5. get a proxy to the service from the CallableReference
Some pointers to code:
[1] and [2] ->
org.apache.tuscany.sca.host.embedded.impl.DefaultSCADomain.getServiceReference()
[3] and [4] ->
org.apache.tuscany.sca.core.component.ComponentContextImpl.createSelfReference()
[5] -> org.apache.tuscany.sca.core.component.CallableReferenceImpl
Now, when the target component/service runs in a different JVM, you
won't have an in-memory model object representing it :( but that's not a
big issue :) ... As you suggested you can simply create a local
reference and bind it to the target service (assuming you know its
binding type and endpoint URI), then proceed to get a CallableReference
and a proxy for it as usual.
This gives us the following steps:
1. determine the binding type and endpoint URI of the target
component/service you're looking for (I won't get into the details of
how to do that here, as I think Simon is covering it in his distributed
binding implementation)
2. dynamically create a reference for your target service and configure
it with that binding and endpoint URI
3. perform steps [4] and [5] from above.
For step 2,
org.apache.tuscany.sca.assembly.builder.impl.CompositeConfigurationBuilderImpl.createSelfReference()
shows how to create a reference from a service.
Hope this helps.
--
Jean-Sebastien
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