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Re: [stp-dev] Re: Follow on meeting about the Hybrid Model
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Andrea, thanks for this, would it be possible to get it recorded onto the wiki
as well to ensure it's more permanent?
Guillaume, would you like to schedule a follow on discussion on this for next
week?
Regards,
Adrian Skehill.
I have a few questions wrt to the meta model described at
http://wiki.eclipse.org/STP_Metamodel
The model defines the notion of service, binding and endpoint, but the
comments below do not put any definition behind these concepts ? Do
they have the same meaning than in WSDL ? If yes, where is the
Interface ? In which case would a service have more than one endpoint
?
This model aims to define both:
1) the concept of service in very similar way as it's in the
webservices world so this is
the reason for the presence of Service, ServiceBinding and Enpoint
entities.
2) The concept of Process as a set of steps and transitions, each steps
use a services with
a particular binding.
When you're using the model to define business process you really
don't care about the
services you just need to use in your step.
Makin a very simple example suppose you have a business process
defined in terms of
three step.
- Take Input -> Make Some Business Transformation -> Make Data
Persistent -> Get Output
this could be mapped to the service in:
- TakeInput ( InputService) -> MakeSomeBusinessTransformation (
BusinessService ) -> MakeDataPersistent( BusinessService) -> GetOuptut(
OutputService)
In that way you've a process with four step and two of that are
reusing the BusinessService.
Then you coul put there the binding so you could have
- TakeInput( InputService, JBIHttpInputBinding )
->MakeSomeBusinessTransformation ( BusinessService,
JBI-XSLT-ServiceEngineBinding )
->MakeDataPersistent( BusinessService, JBI-JDBC-ServiceEngineBinding )
->GetOuptut(OutputService, JBIHttpOutputComponent)
But the "same business process" could have different "technological
details" changing the binding association in the step instances so the
same process could
result in:
- TakeInput( InputService, JBIJmsInputBinding )
->MakeSomeBusinessTransformation ( BusinessService,
JBI-XSLT-ServiceEngineBinding )
->MakeDataPersistent( BusinessService, JBI-JDBC-ServiceEngineBinding )
->GetOuptut(OutputService, JBIJmsOutputBinding)
Also I don't really see why a process step would be linked to a
binding ? It seems to me it should be linked to an Interface or an
Endpoint (if we want the physical location)...
The physical location URI and other details are expresses as properties
of the steps.
Ideas ?
When you've process, modelled as step with binding and properties, the
aim is to get something
that coul deployed in a JBI or SCA runtime.
At the moment i'm working to model a very simple process with two purpose:
1) To get a generator that will give me a deployables service assembly
for servicemix runtime, starting from that model.
By the result will be that ecah step will be mapped to a particular
jbi endpoint ( as we mean in jbi world ).
2) To extends the eclipse bpmn modeler to work with that model. ( a very
basic idea could be to have each bpmn
element mapped to a service but it's just an idea )
By the way this is an intermediate model, and you need to get other
configuration files to get the generators
work. This is because each technology has it's details that cannot be
all included in the intermediate
model.
Please let me know if you've other doubt.
Andrea Zopppello
Engineering Ing. Informatica
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