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pottas · Posted: Mon Apr 21, 2008 8:38 pm Post subject:

Guys,
I have the following design question around a Web Services flow within Message Broker. Here's the background:
I have a composite service exposed in Message Broker with a number of operations that needs to be split into separate operations that will invoke the various service endpoints on the back-end.
The responses from the back-end will then be merged into the original request that will be sent back to the consumer.
As per jeff's suggestion, I don't need to use aggregation - very good and well - I totally agree with him:

http://www.mqseries.net/phpBB2/viewtopic.php?t=42560&highlight=

So I resorted to the following flow design:
HTTPInput -->
Compute (splitting the operations into separate services) -->
HTTPRequest Nodes (to call the individual back-end operations and putting the responses into my Environment tree, under WebResponse1, WebResponse2, etc...) -->
Compute (to merge the resulting data into the response that will be sent back to the consumer) -->
HTTPReply Node to build a composite reply back to the consumer.

So here comes my question: Every HTTPRequest I make to the Host must build the output to my Environment tree. So I added a (dummy) Compute Node after each HTTPRequest Node and return a 'false'. Once the last HTTPRequest Node has executed, I build my Response from my Environment tree.

Is this the way to go? Is this a (at least fairly) good design, is there another way of doing it - if so, please share...