design - Communication between client class library and web service / web service and server class library -

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wondering others / best practice communicating between layers. question relates communication between layers 2-3 , 3-4.

our basic architecture (in order) follows:

  1. ui
  2. front end business classes
  3. web services
  4. back end business classes
  5. dal

the web services façade include logging , authentication end class libraries.

as such, web service passed request object includes parameters required web method along user credential (the user credential example stored in base class need pass webservice) , responds response objects (has things such status , message, if failed etc along object required) both request & response use custom generic class/or interface 1 result returned, otherwise class needs created.

sometimes makes sense response object @ layer 4 (though don't use request object unless lot of parameters need pasaws), in case have adapter class in layer 3 returns client. consistency have considered doing time, though think may overkill.

so iterate question, best practices communicating between layers? , should/do people use method outlined above (it works us) , should layers 3-4 implement similar method 2-3?

possible considerations:

  • currently coded in house team of developers, client code may outsourced in future
  • future web services wcf based (not sure if effects design other coding interfaces prefer anyway).
  • we use .net

for sake of completeness:

it seems idea have response / requests in class library, way if want change web service wcf, there less work do.


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