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Re: An Example Use of RM's MakeConnection

From: Doug Davis <dug@us.ibm.com>
Date: Tue, 10 Oct 2006 11:56:28 -0400
To: Marc Hadley <Marc.Hadley@Sun.COM>
Cc: public-ws-addressing@w3.org, public-ws-addressing-request@w3.org
Message-ID: <OFABA244A2.B8E4E8FA-ON85257203.00576B5B-85257203.0057905D@us.ibm.com>
And what is the GetQuoteResponse message a reply to? If its a reply to the 
original request and that request had a replyTo set to anon then per the 
WSA rules the GetQuoteResponse should have flowed back on the original 
backchannel but it didn't.

-Doug




Marc Hadley <Marc.Hadley@Sun.COM> 
Sent by: public-ws-addressing-request@w3.org
10/10/2006 11:33 AM

To
Doug Davis/Raleigh/IBM@IBMUS
cc
public-ws-addressing@w3.org
Subject
Re: An Example Use of RM's MakeConnection






On Oct 9, 2006, at 8:29 PM, Doug Davis wrote:
>
> Also, let's not forget that WSA's definition is pretty clear that 
> anon means the _current_ backchannel.  RM's anon URI allows for the 
> messages to flow over a subsequent backchannel - this is a change 
> to the semantics of Anon.  Doesn't seem like having a ref-p or some 
> wsa:RelatesTo change those semantics is kosher.

The WS-A ReplyTo applies to the current SOAP message, not some 
application-level concept of a reply so I don't see any conflict. In 
WS-A terms, the wsrm:CreateSequence is the reply to the first message.

Marc.

>
> Christopher B Ferris/Waltham/IBM@IBMUS
> Sent by: public-ws-addressing-request@w3.org
> 10/09/2006 04:48 PM
>
> To
> Marc Hadley <Marc.Hadley@Sun.COM>
> cc
> Doug Davis/Raleigh/IBM@IBMUS, public-ws-addressing@w3.org, public- 
> ws-addressing-request@w3.org
> Subject
> Re: An Example Use of RM's MakeConnection
>
>
>
>
>
>
> Marc,
>
> Fine for handling request/response I suppose. However, not 
> everything is request/response. How does this work when
> there is no "response" but rather a need to get messages from the 
> "server" to the "client"?
>
> Cheers,
>
> Christopher Ferris
> STSM, Software Group Standards Strategy
> email: chrisfer@us.ibm.com
> blog: http://www.ibm.com/developerworks/blogs/page/chrisferris
> phone: +1 508 377 9295
>
> public-ws-addressing-request@w3.org wrote on 10/09/2006 12:26:07 PM:
>
> > Looking at the message flow, I think WS-RM could make more use of
> > wsa:RelatesTo instead of inventing a new anon URI. Here's the same
> > message flow using the WS-A anon URI and making more use of
> > wsa:RelatesTo and @RelationshipType.
> >
> > I think this formulation removes the requirement for additional 
> WSRM-
> > specific anon URIs, let me know if I missed anything.
> >
> > Marc.
> >
> > Scenario: Client sends GetQuote to server unreliably.  Server wants
> > to send GetQuoteResponse using RM so it must sent a CreateSequence
> > before I can send the GetQuoteResponse back.
> >
> > Step 1 - Client sends GetQuote to Server
> > <soap:Envelope ...>
> >   <soap:Header>
> >    <wsa:To> http://stockquote.com </wsa:To>
> >    <wsa:Action> foo:GetQuote </wsa:Action>
> >    <wsa:MessageID> uuid://.../100 </wsa:MessageID>
> >    <wsa:ReplyTo>
> >     <wsa:Address>http://www.w3.org/.../anonymous</wsa:Address>
> >    </wsa:ReplyTo>
> >   </soap:Header>
> >   <soap:Body>
> >    <foo:GetQuote> IBM </foo:GetQuote>
> >   </soap:Body>
> > </soap:Envelope>
> >
> > Step 2 - Server sends an RM CreateSequence to the Client using the
> > only means it has available - the transport backchannel.
> > <soap:Envelope ...>
> >   <soap:Header>
> >    <wsa:To>http://www.w3.org/.../anonymous</wsa:To>
> >    <wsa:Action> http://...wsrm/CreateSequence </wsa:Action>
> >    <wsa:MessageID> uuid://.../101 </wsa:MessageID>
> >    <wsa:RelatesTo RelationshipType="http://...wsrm/InitReliable">
> >      uuid://.../100
> >    </wsa:RelatesTo>
> >    <wsa:ReplyTo>
> >     <wsa:Address> http://stockquote.com </wsa:Address>
> >    </wsa:ReplyTo>
> >   </soap:Header>
> >   <soap:Body>
> >    <wsrm:CreateSequence> ... </wsrm:CreateSequence>
> >   </soap:Body>
> > </soap:Envelope>
> >
> > Notice the use of RelatesTo with a WSRM-specific 
> @RelationshipType to
> > indicate that this message is a WSRM-specific response to the 
> initial
> > request.
> >
> > Step 3 - Client sends a CreateSequenceResponse to wsa:ReplyTo
> > <soap:Envelope ...>
> >   <soap:Header>
> >    <wsa:To> http://stockquote.com </wsa:To>
> >    <wsa:Action> http://...wsrm/CreateSequenceResponse </wsa:Action>
> >    <wsa:RelatesTo> uuid://.../101 </wsa:RelatesTo>
> >   </soap:Header>
> >   <soap:Body>
> >    <wsrm:CreateSequenceResponse> ... </wsrm:CreateSequenceResponse>
> >   </soap:Body>
> > </soap:Envelope>
> >
> > Step 4 - Having not received the GetQuoteResponse, the Client uses
> > MakeConnection to allow it to flow back
> > <soap:Envelope ...>
> >   <soap:Header>
> >    <wsa:To> http://stockquote.com </wsa:To>
> >    <wsa:Action> http://...wsrm/MakeConnection </wsa:Action>
> >    <wsa:ReplyTo>
> >     <wsa:Address>http://www.w3.org/.../anonymous</wsa:Address>
> >    </wsa:ReplyTo>
> >    <wsa:RelatesTo RelationshipType="http://...wsrm/InitialRequest">
> >      uuid://.../100
> >    </wsa:RelatesTo>
> >   </soap:Header>
> >   <soap:Body>
> >    <wsrm:MakeConnection>
> >    </wsrm:MakeConnection>
> >   </soap:Body>
> > </soap:Envelope>
> >
> > Notice the use of the wsa:RelatesTo with a WSRM-specific
> > @RelationshipType to indicate that this message is requesting a
> > response to the initial request message.
> >
> > Step 5 - Server uses the backchannel to let the GetQuoteResponse 
> flow
> > back to the Client
> > <soap:Envelope ...>
> >   <soap:Header>
> >    <wsa:To>http://www.w3.org/.../anonymous</wsa:To>
> >    <wsa:Action> foo://GetQuoteResponse </wsa:Action>
> >    <wsa:RelatesTo> uuid://.../100 </wsa:RelatesTo>
> >    <wsrm:Sequence> ... </wsrm:Sequence>
> >   </soap:Header>
> >   <soap:Body>
> >    <foo:GetQuoteResponse> 139.0 </foo:GetQuoteResponse>
> >   </soap:Body>
> > </soap:Envelope>
> >
> > Notice the wsa:RelatesTo points to the GetQuote request message and
> > it is sent using RM (the Sequence header), and that the SOAP 
> Envelope
> > looks exactly like it would if it had been sent on the original
> > transport backchannel - meaning, the wsa:To is derived from the
> > wsa:ReplyTo from the GetQuote request message not the 
> MakeConnection.
> >
> > ---
> > Marc Hadley <marc.hadley at sun.com>
> > Business Alliances, CTO Office, Sun Microsystems.
> >
> >

---
Marc Hadley <marc.hadley at sun.com>
Business Alliances, CTO Office, Sun Microsystems.
Received on Tuesday, 10 October 2006 15:56:52 GMT

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