Re: [sca-bindings] [Issue 2] Inlined proposal v2

[Mike Edwards <mike_edwards@uk.ibm.com>]

Folks,

I agree with Eric.

There should be no mandatory requirement
to support the WS-MC flavour of this.  It should be purely optional.


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

From:	Eric Johnson <eric@tibco.com>
To:	Anish Karmarkar <Anish.Karmarkar@oracle.com>
Cc:	Simon Nash <oasis@cjnash.com>, OASIS Bindings <sca-bindings@lists.oasis-open.org>
Date:	14/05/2009 18:59
Subject:	Re: [sca-bindings] [Issue 2] Inlined proposal v2

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Hi Anish,

Anish Karmarkar wrote: 
Simon Nash wrote: 
Anish, 
As currently written, the conformance section requires that 
implementations claiming support for the SCA Web Services 
Callback Protocol MUST support both the "regular" flavor 
defined in section 5 and the WS-MC flavor defined in section 
5.1.  I thought the intention was to give these two flavors 
equal status and allow implementations to support either or 
both of them. 


I had thought otherwise. I.e., a runtime is required to support both. A
particular service/composite gets to choose whether it wants to use polling
or host a listener. I don't feel strongly about this, but we should discuss
as to what we would like. 
I side with Simon here.  In the scenario where I
support callbacks, I can have lots of reasons for not supporting callbacks
via a polling mechanism.  To wit:

• Security
• Latency
• Bandwidth consumption

There are
other, far better ways to send messages asynchronously (JMS, SMTP, XMPP),
and mandating that any implementation that supports the direct callback
mechanism must also support the polling callback flies in the face of this
simple technical observation.  Why would we want to mandate the use
of an inferior approach?

-Eric.

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