RE: [sca-bindings] ISSUE-22: The Bindings specifications should provide exemplary Implementations for a) Callbacks and b) Conversations

["Patil, Sanjay" <sanjay.patil@sap.com>]

One question inline below ...

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From: Mike Edwards [mailto:mike_edwards@uk.ibm.com]
Sent: Thursday, Feb 21, 2008 8:15 AM
To: OASIS Bindings
Subject: RE: [sca-bindings] ISSUE-22: The Bindings specifications should provide exemplary Implementations for a) Callbacks and b) Conversations

Peter,

Interesting question - and an interesting answer too.

1) For conversational, since this is an intent, a bindingType simply must list the "conversational" intent in its
@alwaysProvides or @mayProvide attribute - if @mayProvide, then there needs to
also be a PolicySet which contains a policy which provides the "conversational"
intent.


2) For callback, we have a problem.  There is no intent "callback" at the moment.  Callbacks are defined by
various mechanisms, but none of them are intents.

So, there is no obvious mechanism by which a bindingType can indicate that it supports callbacks.

Perhaps we should invent a new intent "callback" and then also define that it is "automatically" set whenever
there is other metadata that indicates that there is a callback interface - it can also be specified explictly using
the @requires attribute. If that is done, then a bindingType can indicate its support as for conversational. 

  
<Sanjay> Under what circumstances would it be useful to specify the 'callback' intent via the @requires attribute (and not depend upon the interface to express that there exists a callback) </Sanjay> 

 
Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014    Mobile: +44-7802-467431  
Email:  mike_edwards@uk.ibm.com

"Peshev, Peter" <peter.peshev@sap.com>

21/02/2008 16:02

To	"Eric Johnson" <eric@tibco.com>, Mike Edwards/UK/IBM@IBMGB
cc	"OASIS Bindings" <sca-bindings@lists.oasis-open.org>
Subject	RE: [sca-bindings] ISSUE-22: The Bindings specifications should provide exemplary Implementations for a) Callbacks and b) Conversations

Hi,
 
just a question about that issue, how a binding should declare the support or lack of support of those features. Is it by  intents "Callbackable" , "Conversational" , "NotSupportedCallback" , etc. ?
 
Peter

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From: Eric Johnson [mailto:eric@tibco.com]
Sent: Monday, 4. February 2008 21:45
To: Mike Edwards
Cc: OASIS Bindings
Subject: Re: [sca-bindings] ISSUE-22: The Bindings specifications should provide exemplary Implementations for a) Callbacks and b) Conversations

Logged as http://www.osoa.org/jira/browse/BINDINGS-22

-Eric.

Mike Edwards wrote:

Raiser:                Mike Edwards

Target:                Web Services Binding specification, JMS Binding Specification, JCA Binding Specification

Description:

At present, it is not clear which, if any, of the Bindings specifications enable the implementation of two important
features of SCA described in the Assembly specification - namely Callback interfaces and Conversational
interfaces.

Each of the Bindings specifications should explicitly declare if it is possible to support each of these features.

For each of the Bindings specifications that claim to support either or both of these features, the specification
should provide a full description of at least one exemplary implementation of the feature using the Binding
technology described in the specification.  Multiple alternative implementations are permitted and may be
added to the specification.

For example, it may be possible to implement Callbacks using WS-Addressing capabilities with Web services.
If so, and example, showing the use of appropriate features of WS-Addressing and other relevant WS-*
capabilities should be added to the specification.   If an alternative exists using (say) WS-Context, then an
example based on that technology can also be provided.

Proposal:

None at present.


Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014    Mobile: +44-7802-467431  
Email:  mike_edwards@uk.ibm.com

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