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Server-side host classes Server-side data portal
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Server-side child data portal Implements data access behaviors for objects that are contained within other objects Object factory Provides an alternate model for the data portal, where the data portal creates and invokes a factory object instead of interacting directly with the business object
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Let s discuss each area of functionality in turn.
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The client-side DataPortal is implemented as a static class, which means that any public methods it exposes become available to business object code without the need to create a DataPortal object. The methods it provides are Create(), Fetch(), Update(), Delete(), and Execute(). Business objects
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and collections use these methods to retrieve and update data, or in the case of a CommandBase-derived object, to execute server code on the server. The client-side DataPortal has a great deal of responsibility, however, since it contains the code to read and act on the client s configuration settings. These settings control whether the serverside data portal components will actually run on the server or locally on the client. It also looks at the business object itself, since a RunLocal attribute can be used to force persistence code to run on the client, even if the configuration says to run it on the server. Either way, the client-side DataPortal always delegates the call to the server-side data portal, which handles the actual object-persistence behaviors. However, if the client configuration indicates that the server-side data portal really will run on a server, the configuration will also specify which network transport should be used. It is the client-side DataPortal that reads that configuration and loads the appropriate client-side proxy object. That proxy object is then responsible for handling the network communication. As an object is implemented, its code will use the client-side DataPortal to retrieve and update the object s information. An automatic result is that the code in the business object won t need to know about network transports or whether the application is deployed into a 1-, 2-, or n-tier physical environment. The business object code always looks something like this: public static Customer GetCustomer(string id) { return DataPortal.Fetch<Customer>(new SingleCriteria<Customer, string>(id)); } An even more important outcome is that any UI code using these business objects will look something like this: var cust = Customer.GetCustomer(myId); Neither of these code snippets changes, regardless of whether you ve configured the server-side data portal to run locally or on a remote server via WCF, remoting, web services, or Enterprise Services. All that changes is the application s configuration file.
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While it is the client-side DataPortal that reads the client configuration to determine the appropriate network transport, the client-side proxy classes actually take care of the details of each network technology. There is a different proxy class for each technology: WCF, remoting, web services, and Enterprise Services. The design also allows for a business application to provide its own proxy class to use other protocols. This means you can write your own TCP sockets protocol if you are so inclined. The WCF proxy can use any synchronous channel supported by WCF. The data portal requires synchronous communication between client and server but otherwise doesn t care which WCF channel is actually used (HTTP, TCP, etc.). Additionally, you can configure WCF using any of its normal options, such as encryption. The remoting and web services proxies use the HTTP protocol for communication across the network. This makes both of them firewall and Internet friendly. The Enterprise Services proxy uses DCOM for communication across the network. This is often faster than HTTP but harder to configure for firewalls or the Internet. Both HTTP and DCOM can be configured to encrypt data on the wire and so provide quite high levels of security if needed. Every client-side proxy has a corresponding server-side host class. This is because each transport protocol requires that both ends of the network connection use the same technology. The client-side DataPortal simply creates an instance of the appropriate client-side proxy and then delegates the request (Create, Fetch, Update, Delete, or Execute) to the proxy object. The proxy
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