RE: [ws-rx] Relationship of ISSUE 008 with ISSUE 021

Ashok:

-----Original Message-----
From: Ashok Malhotra [mailto:ashok.malhotra@oracle.com]
Sent: Thursday, September 29, 2005 8:34 AM
To: Tom Rutt2; wsrx
Subject: RE: [ws-rx] Relationship of ISSUE 008 with ISSUE 021

Tom:

You can attach policies at the binding level.

This allows you to do what you want.

<JD> mmmh... rmpolicy says at wsdl:binding level. that seems to only allow port-level granularity.

But there are other problems. As I see it, the

binding (or message) definition is for the messages

in the sequence - not the framing messages such as

CreateSequence, CreateSequenceResponse, Ack, etc.

So if we attach a QoS policy to the binding, which

messages does it apply to?

<JD> clearly not to these "protocol-signaling" messages, which are not exposed in WSDL. But I do not see a problem here - unless you want them to be reliable too? (I think there is a consensus that they don't need to - e.g. if a CreateSequence "fails" , an RMS may always decide to resend a new one. And if a stand-alone Ack is lost, subsequent ones will make-up.)

All the best, Ashok

> -----Original Message-----

> From: Tom Rutt [mailto:tom@coastin.com]

> Sent: Thursday, September 29, 2005 8:23 AM

> To: wsrx

> Subject: [ws-rx] Relationship of ISSUE 008 with ISSUE 021

> The Sept 2004 version of WS-policy attachment includes the following

> section:

> "

> 4.1.4 Message Policy Subject The following WSDL/1.1 elements

> are used to describe messages:

> . wsdl:message

> . wsdl:portType/wsdl:operation/wsdl:input

> . wsdl:portType/wsdl:operation/wsdl:output

> . wsdl:portType/wsdl:operation/wsdl:fault

> . wsdl:binding/wsdl:operation/wsdl:input

> . wsdl:binding/wsdl:operation/wsdl:output

> . wsdl:binding/wsdl:operation/wsdl:fault

> The current WS-RM policy spec attaches policy at the endpoint

> subject level.

> If we could attach the Qos policy for DA at the message

> subject level, we would be in a better position to express

> the desired semantics for Reliability of a WSDL

> Request/response operation.

> For example, exactly once, ordered could be attached to the

> request message, while no reliability qos is attached to the response.

> Other examples could attache reliability DA levels to the

> response message as well.

> Thus I now see that Issue 008 on granularity of reliability

> policy attachment, and Issue 021 on reliability for two way

> exchanges should be discussed together.

> Tom Rutt

> --

> ----------------------------------------------------

> Tom Rutt email: tom@coastin.com; trutt@us.fujitsu.com

> Tel: +1 732 801 5744 Fax: +1 732 774 5133

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