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In my classes, I always take the example a bit farther and tell nice stories about how Italians apply the pattern to parking. But if you re interested in hearing about that, well, it s best if you attend the next class!

3 4 5

Data Access Layer Persistence Layer (O/RM, custom data context)

The beauty of ASP.NET is that its architecture is extensible. This claim is true also for classic ASP, but you had to be a C++ wizard to create ISAPI filters for IIS. Things are one or two orders of magnitude simpler with ASP.NET, and you can implement all these features in your good old Visual Basic! For starters, let s compare the two extension mechanisms that ASP.NET provides:

Where do you start designing the layers of a real-world system Ouch! That s a really tough point. It depends. Trying to go to the root of it, I d say it depends on the methodology you use to process requirements. Which methodology you apply also depends on something. It usually depends on your skills, your attitude, and your preference, as well as what seems to be best in the specific business scenario and context. Any system has its own set of requirements that originate use-cases. The ultimate goal of the application is implementing all use-cases effectively. A classic approach entails that you figure out what data and behaviors are required by all use-cases (or just one use-case) and build a good representation of the data involved and the related actions. So you start from the business layer, and in particular from modeling the entities in play and their relationships. I start my building from the business layer, and my main reason for that is to have as soon as possible a well-defined set of entities and relationships to persist and build a user interface around. To get my entities and relationships, however, I need to take a deep look at UI expectations and storage constraints, if any.

HTTP handlers are components that handle requests for a given resource type. For example, ASP.NET uses a handler to manage requests for plain .aspx files and another handler to redirect requests for the special trace.axd resource. (Notice that we must use the term resource here because trace.axd isn t a physical file; hanZ dlers can trap requests for resources before ASP.NET checks that these resources actually exist.) HTTP modules are filters that are notified when a request is posted to the ASP.NET application; they loosely correspond to ISAPI filters in IIS. A module can trap a request only if it has been already accepted by ASP.NET, so there must be a regisZ tered handler for it. A module can trap the request both before and after the hanZ dler associated with it has processed it. ASP.NET uses modules to implement authentication and session state services.

The business logic layer is the heart of the system and the place where the behavior of the system is implemented The behavior is just one aspect of the design of a system; another key aspect is data Data is collected and displayed in the presentation layer, and it s persisted and retrieved in the data access layer Living in the middle, the business layer is where the data is processed according to some hard-coded behavior (Note that in some very dynamic systems, the behavior can also be dynamically defined) Generally speaking, the BLL is made of a few parts: the application s logic, the domain logic, a representation for domain data, plus optional components such as local services and workflows Invoked from the presentation layer, the application logic orchestrates services and DAL to produce a response for any client requests.

I ll begin with a discussion of the simpler of the two modules. As a matter of fact, implementing HTTP modules is a breeze if you carefully read The Global.asax File section, earlier in this chapter.