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Server-Side Host Objects
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I ve already discussed the client-side proxy objects and how each one has a corresponding serverside host object. In 4, I ll create three host objects, one for each protocol: 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 clientside 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 a couple of server-side host technologies for hosting application server code: Internet Information Services (IIS) and Enterprise Services. 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 either IIS or Enterprise Services. Worse, you ll have opened yourself up for unforeseen security and stability issues. The remoting and Web Services host objects are designed to run within the IIS host. This way, they can take advantage of the management, stability, and security features inherent in IIS. The Enterprise Services host object is designed to run within Enterprise Services, taking advantage of its management, stability, and security features. Both IIS and Enterprise Services provide a robust process model and thread management, and so provide very high levels of scalability.
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Server-Side Data Portal
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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 in this case, a business object.
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s Note I say server-side here, but keep in mind that the server-side data portal components may run either on the client workstation or on a remote server. Refer to the client-side DataPortal discussion regarding how this selection is made. The data portal is implemented to minimize overhead as much as possible when configured to run locally or remotely, so it is appropriate for use in either scenario.
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For Create, Fetch, and Delete operations, the server-side data portal requires type information about your business object. Typically, this is provided via the criteria object. For update and execute operations, the business object itself is passed to the server-side data portal. But the server-side data portal is more than a simple message router. It also provides optional access to the transactional technologies available within .NET, namely Enterprise Services (MTS/ COM+) and the new System.Transactions namespace. The business framework defines a custom attribute named TransactionalAttribute that can be applied to methods within business objects. Specifically, you can apply it to any of the data access
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CHAPTER 2 s FRAMEWORK DESIGN
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methods that your business object might implement to create, fetch, update, or delete data, or to execute server-side code. This allows you to use one of three models for transactions, as listed in Table 2-5. Table 2-5. Transaction Options Supported by Data Portal
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Description
You are responsible for implementing your own transactions using ADO.NET, stored procedures, etc. Your data access code will run within a COM+ distributed transactional context, providing distributed transactional support. Your data access code will run within a TransactionScope from System.Transactions, automatically providing basic or distributed transactional support as required.
Transactional Attribute
None or [Transactional (TransactionalTypes.Manual)]
Enterprise Services
[Transactional(Transactional Types.EnterpriseServices)]
System.Transactions
[Transactional(Transactional Types.TransactionScope)]
This means that in the business object, there may be an update method (overriding the one in BusinessBase) marked to be transactional: [Transactional(TransactionalTypes.TransactionScope)] protected override void DataPortal_Update() { // Data update code goes here } At the same time, the object might have a fetch method in the same class that s not transactional: private void DataPortal_Fetch(Criteria criteria) { // Data retrieval code goes here } This facility means that you can control transactional behavior at the method level, rather than at the class level. This is a powerful feature, because it means that you can do your data retrieval outside of a transaction to get optimal performance, and still do updates within the context of a transaction to ensure data integrity. The server-side data portal examines the appropriate method on the business object before it routes the call to the business object itself. If the method is marked as [Transactional (TransactionalTypes.EnterpriseServices)], then the call is routed to a ServicedDataPortal object that is configured to require a COM+ distributed transaction. The ServicedDataPortal then calls the SimpleDataPortal, which delegates the call to your business object, but only after it is running within a distributed transaction. If the method is marked with [Transactional(TransactionalTypes.TransactionScope)],the call is routed to a TransactionalDataPortal object that is configured to run within a System. Transactions.TransactionScope. A TransactionScope is powerful because it provides a lightweight transactional wrapper in the case that you are updating a single database; but it automatically upgrades to a distributed transaction if you are updating multiple databases. In short, you get the benefits of COM+ distributed transactions if you need them, but you don t pay the performance penalty if you don t need them. Either way, your code is transactionally protected.
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