Rhino Service Bus - Messaging between web server and app server.

[Daventry]

Hi,

 

We'd like to use RSB to send/receive messages between a web server and an application server that will run a long-running task.

 

When the long-running task finishes and sends a message back to the web server - how's it picked by RSB? Is there a long-running thread watching the message queue? We're concerned about having long-running tasks on the web server - i.e a thread polling a message queue in this case. If so, are there any other alternatives?

 

BTW - what are the best practices to notify the client about the completion of the task? It is a Silverlight client.

 

Thanks and regards.

[Jason Meckley]

RSB polls the queue, listening for incoming messages. I don't recall the exact implementation, but memory and open queues are not an issue. The thing to remember is that messages are not handled within the context of an http request, so you will need a mechanism (data cache) to move the result of handling the message to an http context. the client will poll the webserver when the request comes in check the data cache for a result and process accordingly.

[Jason Meckley]

another option is to have a one way bus from the web to the service. the service will process the message and persist the result to disk (database, pht, etc) the web can then access the persistent storage. this way the web doesn't receive incoming messages. it only sends them out.

[Corey Kaylor]

Why is this a concern for you, I'm curious?

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[Daventry]

Well, I have always worked in desktop applications and this is my first web app. Have always heard is not to good to have long running tasks within IIS.

BTW, where should we have the RSB startup code for the web server, in the global.asax ?

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[Jason Meckley]

Yes, the application start in the global.asax is where you put all of your start up code. long running tasks in IIS refer to request/response.