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With consistent use of business objects, there s no way to bypass the business logic. The only way to the data is through the object, and the object always enforces the rules.
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So, a business object that represents an invoice will include not only the data pertaining to the invoice, but also the logic to calculate taxes and amounts due. The object should understand how to post itself to a ledger and how to perform any other accounting tasks that are required. Rather than passing raw invoice data around and having the business logic scattered throughout the application, it is possible to pass an Invoice object around. The entire application can share not only the data, but also its associated logic. Smart data through objects can dramatically increase the ability to reuse code and can decrease software maintenance costs.
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Anatomy of a Business Object
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Putting all of these pieces together, you get an object that has an interface (a set of properties and methods), some implementation code (the business logic behind those properties and methods), and state (the data). This is illustrated in Figure 1-14.
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Figure 1-14. A business object composed of state, implementation, and interface
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CHAPTER 1 DIS TRIBUTED ARC HITE CTURE
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The hiding of the data and the implementation code behind the interface are keys to the successful creation of a business object. If the users of an object are allowed to see inside it, they will be tempted to cheat and to interact with the logic or data in unpredictable ways. This danger is the reason why it is important to take care when using the public keyword as you build your classes. Any property, method, event, or field marked as public is available to the users of objects created from the class. For example, you might create a simple class such as the following: public class Project { private Guid _id = Guid.NewGuid(); public Guid Id { get { return _id; } } private string _name = string.Empty; public string Name { get { return _name; } set { if (value == null) value = string.Empty; if(value.Length > 50) throw new Exception("Name too long"); _name = value; } } } This defines a business object that represents a project of some sort. All that is known at the moment is that these projects have an ID value and a name. Notice, though, that the fields containing this data are private you don t want the users of your object to be able to alter or access them directly. If they were public, the values could be changed without the object s knowledge or permission. (The _name field could be given a value that s longer than the maximum of 50 characters, for example.) The properties, on the other hand, are public. They provide a controlled access point to the object. The Id property is read-only, so the users of the object can t change it. The Name property allows its value to be changed, but enforces a business rule by ensuring that the length of the new value doesn t exceed 50 characters.
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None of these concepts are unique to business objects they re common to all objects and are central to object-oriented design and programming.
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Mobile Objects
Unfortunately, directly applying the kind of object-oriented design and programming I ve been talking about so far is often difficult in today s complex computing environments. Object-oriented programs are almost always designed with the assumption that all the objects in an application can interact with each other with no performance penalty. This is true when all the objects are running in the same process on the same computer, but it s not at all true when the objects might be running in different processes or even on different computers.
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