By Rockford Lhotka
This article exhibits how you can construct an n-tier structure in .NET, layout a disbursed object-oriented structure with VB .NET, and construct a reusable framework to enforce a dispensed object-oriented structure.
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We typically spend far too little time analyzing our business requirements and developing good application designs to meet those business needs. Part of the reason is that we often end up spending substantial amounts of time analyzing and designing the ‘plumbing’ that supports the business application, and we run out of time to analyze the business issues themselves. What I'm proposing here is that we can reduce the time spent analyzing and designing the low-level plumbing by creating a framework that can be used across many of our business applications.
Architectures and frameworks Our discussion so far has focused mainly on architectures: logical architectures that define the separation of roles in our application, and physical architectures that define the locations where our logical tiers will run in Chapter 1: Distributed Architecture 33 34 Chapter 1: Distributed Architecture various configurations. We've also discussed the use of object-oriented design and the concepts behind distributed objects. While all of these are important and must be thought through in detail, we really don't want to have to go through this process every time we need to build an application.
Should the UI developer be aware of any application servers? Should they be aware of any database servers? Or should they simply interact with a set of abstract objects? NET. NET. Note Inevitably, the result will be a compromise. As with many architectural decisions, there are good arguments to be made for each option. In your environment, you may find that a different decision would work better. Keep in mind, though, that this particular decision is fairly central to the overall architecture of the framework we're building, so choosing another option will likely result in dramatic changes throughout the framework.
Expert one-on-one Visual Basic .NET business objects by Rockford Lhotka