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Re: An Example Use of RM's MakeConnection

From: Marc Hadley <Marc.Hadley@Sun.COM>
Date: Thu, 12 Oct 2006 16:07:46 -0400
To: David Hull <dmh@tibco.com>
Cc: Doug Davis <dug@us.ibm.com>, public-ws-addressing@w3.org
Message-id: <ABFD067A-2A5E-4148-96CA-26B7FFE6AACD@Sun.COM>
The message in step 2 is still a response in WS-A and SOAP binding  
terms. Its not the output message from the WSDL because the use of RM  
is inserting additional messages into the exchange.

Marc.

On Oct 12, 2006, at 1:37 PM, David Hull wrote:

> According to section 5 of the SOAP binding, if [reply endpoint] is
> anonymous, then "any response MUST be the
> http://www.w3.org/2003/05/soap/mep/OutboundMessage property of the  
> same
> instance of the SOAP request-response MEP".  There is no definition of
> "response" in this section, but given that we define "response  
> endpoint"
> as [reply endpoint] or [fault endpoint] and lacking any other  
> plausible
> interpretation, the intent is clear: a response is a reply or a fault.
>
> A reply MUST be formulated according to the rules in section 3.   
> Section
> 4 of the WSDL spec says that the reply message would have an  
> [action] of
> foo:GetQuoteResponse and otherwise follow the WSDL operation  
> description
> (assuming this description is WSA-aware).  In other words, the message
> in step 5 is the reply.
>
> The server below is behaving incorrectly in step 2.  The [reply
> endpoint] of anonymous requires it to send the message it sends in  
> step
> 5 in step 2 instead.
>
>
> Marc Hadley wrote:
>> 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 Thursday, 12 October 2006 20:07:57 GMT

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