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Petstore Architecture

Bess Moore
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Hi there,
how you all are well, i have got some really confuse question about the petstore blueprint architecture.

Unlike the JSF using the manage bean to initial the html action, it has the own action servlet which initial by the controller.

Look like the request is passed from

facesservlet - controller -action -biz service.

1.i can't think of any reason why they needing a controller?

2.i wish to add a layer delegate before the call to biz service, if the petstore is valid, which mean will i have too many layers?
facesservlet - controller -action -delegate - biz service.

i been confuse about this for weeks... any ideal?

much much appreciated...

thanks thanks thanks

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