The WS-RM Sequence Lifetime in Indigo

re: The WS-RM Sequence Lifetime in Indigo

Guy Crets — Sun, 20 Nov 2005 13:39:03 GMT

Ondrej,
Very interesting blog. 2 questions/remarks:

1. Why not consider a Sequence like a queue? The sequence is created at deployment time by an Administrator. InactivityTimeOut=0 (forever) and the LastMessage attribute is never used.

2. What I never see is the use of a single sequence for different services: it would be most interesting to do e.g. a CreateCustomer and CreateOrder within the same Sequence. Just as you can send different message types via the same queue.

I welcome your thoughts.

See also http://www.javapolis.com/confluence/display/JP05/Secure+and+Reliable+Web+Services

re: The WS-RM Sequence Lifetime in Indigo

onhrebic — Wed, 30 Nov 2005 20:40:27 GMT

Hi Guy,

1. The WCF offers two models for reliable messaging. One uses WS-RM and is meant for "live sequences" - those where both parties are up at the same time and actively communicating. We used to call it the "TCP of Indigo." The other one uses MSMQ and behaves exactly like you describe - the queue is created at deployment time and never expires.

2. WS-RM sequences are always created between exactly two endpoints (the sending endpoint's address is the CreateSequence's ReplyTo EPR, the receving endpoint's address is the WSDL address). In WCF, an endpoint is uniquely defined by its EPR, its binding, and its service contract. As such, it wouldn't make sense to have one WS-RM sequence "span" multiple WCF services. Of course, if the CreateCustomer and CreateOrder actions are both exposed on the same contract, one WS-RM sequence will work just fine.

Feel free to post back,
Ondrej

re: The WS-RM Sequence Lifetime in Indigo

Guy Crets — Sat, 14 Jan 2006 18:56:45 GMT

Ondrej,
Thanks for your answers.

1. Still, I would love to have Indigo/WCF support "long lived sequences" without MSMQ.

WS-RX could then be used as the standard for messaging and B2B protocols. WS-RX could then be use as THE messaging protocol. No more MSMQ, proprietary JMS protocols, MQSeries, AS2, ...

I don't really see the purpose of "live sequences". Unless you do SOAP over UDP.

3. And something else: support for clients sitting behind firewalls. There was an initiative from IBM for WS-Polling. Don't know if it is catching on.

Regards, Guy Crets

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