ISSUE-61: How are mayProvide intents on bindings satisfied

[David Booz <booz@us.ibm.com>]

http://www.osoa.org/jira/browse/POLICY-61

Dave Booz
STSM, BPM and SCA Architecture
Co-Chair OASIS SCA-Policy TC and SCA-J TC
"Distributed objects first, then world hunger"
Poughkeepsie, NY (845)-435-6093 or 8-295-6093
e-mail:booz@us.ibm.com

ashok malhotra ---10/07/2008 12:17:41 PM---The SCA Policy spec says that in addition to the intents that a bindingType alwaysProvides

From:	ashok malhotra <ashok.malhotra@oracle.com>
To:	OASIS Policy <sca-policy@lists.oasis-open.org>, OASIS Bindings <sca-bindings@lists.oasis-open.org>
Date:	10/07/2008 12:17 PM
Subject:	[sca-policy] NEW ISSUE: How are mayProvide intents on bindings satisfied

---

The SCA Policy spec says that in addition to the intents that a 
bindingType alwaysProvides

"... The binding type also declares the intents that it may provide by 
using the optional @mayProvide attribute. Intents listed as the value of 
this attribute can be provided by a binding instance configured from 
this binding type."


My assumption was that, to use some of the mayProvide intents, a binding 
instance had to be configured outside of SCA and then that instance used 
for some service/reference. At last week's Policy f2f, it became clear 
that this assumption was not universally shared. Some thought that the 
SCA runtime would configure the binding instance during the deployment 
phase.


I looked at the binding.ws, the binding.jca and the binding.jms specs 
and found that, as expected, binding.ws says nothing about mayProvide. 
Binding.jca does not say anything about mayProvides either. Binding.jms says


<bindingType type=”binding.jms”
alwaysProvides=”jms” mayProvide=”atLeastOnce atMostOnce ordered 
conversational”/>


but it does not say how the mayProvides intents are satisfied. That is, 
it does not say what configuration parameters can used to provide these 
intents.


Thus, two requests


- Clarify whether the binding instances configured to provide the 
capabilities indicated in mayProvides are generated separately, earlier 
and outside of SCA and then used in the SCDL or whether they are 
generated by the SCA runtime.


- As far as possible, indicate in the bindings specs which configuration 
parameters need to be tweaked and how to satisfy the mayProvide intents.


-- 
All the best, Ashok

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