.net barcode Designing the Framework in VB.NET

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Designing the Framework
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So far, I have focused on the major goals for the framework. Having covered the guiding principles, let s discuss the design of the framework so it can meet these goals. In the rest of this chapter, I walk through the various classes that will combine to create the framework. After covering the design, in s 6 through 16 I dive into the implementation of the framework code. A comprehensive framework can be a large and complex entity. Usually many classes go into constructing a framework, even though the end users of the framework the business developers use only a few of those classes directly. The framework discussed here and implemented in s 6 through 16 accomplishes the goals I ve just discussed, along with enabling the basic creation of object-oriented n-tier business applications. For any given application or organization, this framework will likely be modified and enhanced to meet specific requirements. This means that the framework will grow as you use and adapt it to your environment. The CSLA .NET framework contains a lot of classes and types, which can be overwhelming if taken as a whole. Fortunately, it can be broken down into smaller units of functionality to better understand how each part works. Specifically, the framework can be divided into the following functional groups:
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C HAPTE R 2 FRA MEWORK DES IGN
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Business object creation N-level undo functionality Data binding support Validation and business rules A data portal enabling various physical configurations Transactional and nontransactional data access Authentication and authorization Helper types and classes For each functional group, I ll focus on a subset of the overall class diagram, breaking it down into more digestible pieces.
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Business Object Creation
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First, it s important to recognize that the key classes in the framework are those that business developers will use as they create business objects but that these are a small subset of what s available. In fact, many of the framework classes are never used directly by business developers. Figure 2-10 shows only those classes the business developer will typically use.
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Figure 2-10. Framework classes used directly by business developers
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CHAPTER 2 FRAMEWORK DE SIGN
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Obviously, the business developer may periodically interact with other classes as well, but these are the ones that will be at the center of most activity. Classes or methods that the business developer shouldn t have access to will be scoped to prevent accidental use. Table 2-1 summarizes each class and its intended purpose.
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Table 2-1. Business Framework Base Classes
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Class
BusinessBase(Of T) BusinessListBase(Of T, C) EditableRootListBase(Of C)
Purpose
Inherit from this class to create a single editable business object such as Customer, Order, or OrderLineItem. Inherit from this class to create an editable collection of business objects such as PaymentTerms or OrderLineItems. Inherit from this class to implement a collection of business objects, where changes to each object are committed automatically as the user moves from object to object (typically in a data bound grid control). Inherit from this class to implement a command that should run on the application server, such as implementation of a Customer.Exists or Order.ShipOrder command. Inherit from this class to create a single read-only business object such as OrderInfo or ProductStatus. Inherit from this class to create a read-only collection of objects such as CustomerList or OrderList. Inherit from this class to create a read-only collection of key/value pairs (typically for populating drop-down list controls) such as PaymentTermsCodes or CustomerCategories.
CommandBase
ReadOnlyBase(Of T) ReadOnlyListBase(Of T, C) NameValueListBase(Of K, V)
These base classes support a set of object stereotypes. A stereotype is a broad grouping of objects with similar behaviors or roles. Table 2-2 describes the supported stereotypes.
Table 2-2. Supported Object Stereotypes
Stereotype
Editable root
Description
Object containing read-write properties; object can be retrieved/stored directly to database Object containing read-write properties; object is contained within another object and cannot be retrieved/stored directly to database List object containing editable child objects; list can be retrieved/stored directly to database List object containing editable child objects; list is contained within another object and cannot be retrieved/stored directly to database
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