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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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CHAPTER 2 FRAMEWORK DE SIGN
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Figure 2-10. Framework classes used directly by business developers 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. Table 2-1. Business Framework Base Classes
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BusinessBase<T> BusinessListBase<T,C> EditableRootListBase<C>
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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 an Order.ShipOrder command. Inherit from this class to create a single read-only business object such as OrderInfo or ProductStatus.
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ReadOnlyBase<T>
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C HAPTE R 2 FRA MEWORK DES IGN
Table 2-1. Business Framework Base Classes
Class
ReadOnlyListBase<T,C> NameValueListBase<K,V>
Purpose
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.
These base classes support a set of object stereotypes. A stereotype is a broad grouping of objects with similar behaviors or roles. The supported stereotypes are listed in Table 2-2. 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 List object containing editable root objects; list is retrieved directly from database Object that executes a command on the application server and reports back with the results Object containing read-only properties; object can be retrieved directly from database Object containing read-only properties; object is contained within another object and cannot be retrieved directly from database List containing read-only child objects; list can be retrieved directly from database List containing read-only child objects; list is contained within another object and cannot be retrieved directly from database List object containing read-only name/value objects
Base Class
BusinessBase<T>
Editable child
BusinessListBase<T,C>
Editable root list
BusinessBase<T>
Editable child list
BusinessListBase<T,C>
Dynamic root list Command
EditableRootListBase<C> CommandBase
Read-only root Read-only child
ReadOnlyBase<T> ReadOnlyBase<T>
Read-only root list Read-only child list
ReadOnlyListBase<T,C> ReadOnlyListBase<T>
Name/value list
NameValueListBase<K,V>
Let s discuss each stereotype in a bit more detail.
CHAPTER 2 FRAMEWORK DE SIGN
Editable Root
The BusinessBase class is the base from which all editable (read-write) business objects will be created. In other words, to create a business object, inherit from BusinessBase, as shown here: [Serializable] public class CustomerEdit : BusinessBase<CustomerEdit> { } When creating a subclass, the business developer must provide the specific type of new business object as a type parameter to BusinessBase<T>. This allows the generic BusinessBase type to expose strongly typed methods corresponding to the specific business object type. Behind the scenes, BusinessBase<T> inherits from Csla.Core.BusinessBase, which implements the majority of the framework functionality to support editable objects. The primary reason for pulling the functionality out of the generic class into a normal class is to enable polymorphism. Polymorphism is what allows you to treat all subclasses of a type as though they were an instance of the base class. For example, all Windows Forms Form1, Form2, and so forth can be treated as type Form. You can write code like this: Form form = new Form2(); form.Show(); This is polymorphic behavior, in which the variable form is of type Form but references an object of type Form2. The same code would work with Form1 because both inherit from the base type Form. It turns out that generic types are not polymorphic like normal types. Another reason for inheriting from a non-generic base class is to make it simpler to customize the framework. If needed, you can create alternative editable base classes starting with the functionality in Core.BusinessBase. Csla.Core.BusinessBase and the classes from which it inherits provide all the functionality discussed earlier in this chapter, including n-level undo, tracking of broken rules, dirty tracking, object persistence, and so forth. It supports the creation of root objects (top-level) and child objects. Root objects are objects that can be retrieved directly from and updated or deleted within the database. Child objects can only be retrieved or updated in the context of their parent object.
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