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CHAPTER 2 FRAMEWORK DE SIGN
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The ReadOnlyBase class is used to create read-only objects, as follows: <Serializable()> _ Public Class StaticContent Inherits ReadOnlyBase(Of StaticContent) End Class Classes shouldn t implement any read-write properties. If this were to happen, it would be entirely up to the code in the object to handle any undo, persistence, or other features for dealing with the changed data. If an object has editable properties, it should subclass from BusinessBase. Read-only objects include authorization rules so the object can control which users can view each property. Obviously they don t implement business or validation rules because such rules are only invoked when a property changes, and that won t happen with read-only properties.
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ReadOnly Root and Child List
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Not only do applications sometimes need read-only business objects, they also commonly require immutable collections of objects. The ReadOnlyListBase class lets you create strongly typed collections of objects, whereby the object and collection are both read-only: <Serializable()> _ Public Class StaticList Inherits ReadOnlyListBase(Of StaticList, ChildType) End Class As with ReadOnlyBase, this object supports only the retrieval of data. It has no provision for updating data or handling changes to its data. Although the child objects in such a collection may inherit from ReadOnlyBase, they don t have to do so. More commonly, the child objects in a read-only collection are just simple .NET objects that merely expose read-only properties.
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The NameValueListBase class is designed specifically to support the idea of lookup tables or lists of read-only key/value data such as categories, customer types, product types, and so forth. The goal of this class is to simplify the process of retrieving such data and displaying it in common controls such as drop-down lists, combo boxes, and other list controls. The following shows the beginnings of a custom name/value list: <Serializable()> _ Public Class CodeList Inherits NameValueListBase(Of Integer, String) End Class Although the business developer does need to create a specific class for each type of name/ value data, inheriting from this base class largely trivializes the process. There are a couple similar types in the System.Collections.Specialized namespace: NameObjectCollectionBase and NameValueCollection. These types don t automatically integrate with the rest of the CSLA .NET framework for tasks such as object persistence and don t fully support data binding.
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N-Level Undo Functionality
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The implementation of n-level undo functionality is quite complex and involves heavy use of reflection. Fortunately, you can use inheritance to place the implementation in a base class so that no business object needs to worry about the undo code. In fact, to keep things cleaner, this code is in its own base class, separate from any other business object behaviors, as shown in Figure 2-11.
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C HAPTE R 2 FRA MEWORK DES IGN
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Figure 2-11. Separating n-level undo into Core.UndoableBase At first glance, it might appear that you could use .NET serialization to implement undo functionality: what easier way to take a snapshot of an object s state than to serialize it into a byte stream Unfortunately, this isn t as easy as it might sound, at least when it comes to restoring the object s state. Taking a snapshot of a Serializable object is easy and can be done with code similar to this: <Serializable()> _ Public Class Customer Public Function Snapshot() As Byte() Using buffer As New MemoryStream() Dim formatter As BinaryFormatter = New BinaryFormatter() formatter.Serialize(buffer, Me) buffer.Position = 0 Return buffer.ToArray() End Using End Function End Class This converts the object into a byte stream, returning that byte stream as an array of type Byte. That part is easy it s the restoration that s tricky. Suppose that the user now wants to undo the changes, requiring that the byte stream be restored into the object. The code that deserializes a byte stream looks like this:
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