Monday, January 17, 2011

JMS guaranteed delivery -- guaranteed by who?

guaranteed delivery (GD) is a "service" provided by the JMS infrastructure -- the part of the system outside your custom application code. It's also known as the vendor API, which is software provided by IBM, Tibco, BEA etc. A formal name is "JMS provider". It helps to think of this infrastructure as encrypted source code (ESC).

To provide GD (or any JMS service), this infrastructure must include client-side ESC -- formally known as client-runtime.

ESC is simpler in the JDBC world. Sybase provides both a server and a client-side ESC. Your code calls the client-side ESC as a lower-layer API. eSpeed also ships a client side ESC. You link into your custom trading engine, and the client side ESC talks to the eSpeed server.

In tibrv, the daemon runs in each client host and is comparable to a client-side ESC but
$ it runs in a separate process
$ tibrv daemons are peer-to-peer, no client no server.

onMessage() is one of the most important part of the client-side ESC.  But back to GD, ESC supports

* Stored and Forward
* Ack
* auto_ack is sent by the client ESC
* retry at each leg (sender->broker->receiver)

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