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Table 2-5. Data Passed to and from the Server for Data Portal Operations
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Type of object to create and (optional) criteria about new object Type of object to retrieve and criteria for desired object Object to be updated Type of object to delete and criteria for object to be deleted Object to be executed (must derive from CommandBase)
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New object loaded with default values Object loaded with data Object after update (possibly containing changed data) Nothing Object after execution (possibly containing changed data)
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Notice that the Create, Fetch, and Delete operations all use criteria information about the object to be created, retrieved, or removed. A criteria object contains any data you need to describe your particular business object. A criteria object can be created one of three ways: By using the SingleCriteria class provided by CSLA .NET By creating a nested class within your business class By creating a class that inherits from CriteriaBase The SingleCriteria class is a generic type that passes a single criteria value to the server. You specify the type of the value and the value itself. Since most objects are identified by a single unique value, this class can be used to create, fetch, and delete most objects. If your object has more complex criteria, perhaps a compound key in the database or a set of filter values, you ll need to create your own custom criteria class, either as a nested class or by subclassing CriteriaBase. When a criteria class is nested within a business class, the .NET type system can be used to easily determine the type of class in which the criteria is nested. The CriteriaBase class, on the other hand, directly includes a property you must set, indicating the type of the business object. In either case, your custom criteria class should include properties containing any specific information you need in order to identify the specific object to be created, retrieved, or removed.
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I ve already discussed the client-side proxy objects and how each one has a corresponding serverside host object. In 15, I show how the WCF host object is created. You can look at the CSLA .NET code to see how the other three host objects work for remoting, web services, and Enterprise Services. It is also possible to add new host objects without altering the core framework, providing broad extensibility. Any new host object would need a corresponding client-side proxy, of course. Server-side host objects are responsible for two things: first, they must accept inbound requests over the appropriate network protocol from the client, and those requests must be passed along to the server-side data portal components; second, the host object is responsible for running inside the appropriate server-side host technology. Microsoft provides server-side host technologies for hosting application server code: Windows Activation Service (WAS), Internet Information Services (IIS), and Enterprise Services.
CHAPTER 2 FRAMEWORK DE SIGN
It is also possible to write your own Windows service that could act as a host technology, but I strongly recommend against such an approach. By the time you write the host and add in security, configuration, and management support, you ll have recreated most or all of WAS, IIS, or Enterprise Services. Worse, you ll have opened yourself up for unforeseen security and stability issues. The WCF host object is designed to run within the WAS or IIS hosts. This way, it can take advantage of the management, stability, and security features inherent in those server hosting technologies. Both WAS and IIS provide a robust process model and thread management and so supply very high levels of scalability.
Server-Side Data Portal
At its core, the server-side data portal components provide an implementation of the message router design pattern. The server-side data portal accepts requests from the client and routes those requests to an appropriate handler either a business object or a factory object.
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