synchronous called web service consuming another web service asynchronously - design best practice issue

hi guys... would like some advice / guidence with regards to design best practices.

Scenario is:

I'm in the middle of building a web service which is to act as a middleware layer between an IVR platform and a 3rd partys rpc/encoded web service (non standards I know!).

Reasons for this are:

3rd party web service potentially can take upto 30seconds to process a request

Additional logging and validation to take place in my middleware web service

IVR platform can only consume webservices synchronously and cannot consume rpc/encoded web services.

My service will be consumed synchronously. It will consume the 3rd partys service asynchronously. My service will have 2 methods (sendrequest & getResponse).

SendRequest is the bit that does all the asyn work with the other service. i'm maintaining state between send & get calls via a sql database keyed against a GUID returned from sendRequest and passes as a parameter in getResponse

 The Problem:

there is an awful lot of code within SendRequest. usually I prefer to write my logic in separate BLL classes and not even have it in the webservice class. However if i do this, I have to specifiy a method within my BLL class as the callback from the async webservice proxy. the callback method just updates the database ready for when the IVR calls getResponse. (which retrieves this data). Now the problem here is that the class is instantiated within the sendRequest method, which will have completed before the async callback happens... therefore the BLL class is out of scope and garbaged.

Now i have 3 possible solutions to this.

a) Leave all the BLL logic within the main webservice class (really dont like this... not very elegant)

b) have the webservice class maintain a reference to the BLL class via a property (will stay in scope as the async method is running via a worker thread of the original webservice thread which created the instance of the BLL class... i think!)

c) Use a static method within my BLL class as the callback. (need to make sure this is thread safe but essentially all this method will do is update the db with the response from the 3rd party.)

 Any suggestions / ideas / best practices would be appreciated

sorry for the long post but thought it best to get as much info out up front

thanks nik Smile

11/22/2008 11:01:54 PM 7071 articles. 0 followers. Follow

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 Well for any one out there who's got a similar design issue, i found an answer here:


11/26/2008 5:54:22 PM

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