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Implementing Common Rules
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If you consider the validation rules applied to most properties, there s a set of common behaviors that occur time and time again. For example, there s the idea that a string value is required, or that a string has a maximum length.
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C HAPTE R 2 FRA MEWORK DES IGN
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Rather than requiring every business application to implement these same behaviors over and over again, you can have them be supplied by the framework. As you ll see in 11, the implementation makes use of reflection so there s a performance cost. If you find in your particular application that performance cost to be too high, you can always do what you would have done anyway that is, write the rule implementation directly into the application. In most cases, however, the benefit of code reuse will outweigh the small performance cost incurred by reflection.
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Data Portal
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Supporting object persistence the ability to store and retrieve an object from a database can be quite complex. This is covered earlier in the chapter during the discussion about basic persistence and the concept of ORM. As you ll see in 18, data access logic is encapsulated within the formal data access layer assembly, which is invoked by the business objects. This data access assembly must be deployed to the physical tier that will execute the data access code. At the same time, however, you don t want to be in a position in which a change to your physical architecture requires every business object in the system to be altered. The ability to easily switch between having the data access code run on the client machine and having it run on an application server is the goal, with that change driven by a configuration file setting. On top of this, when using an application server, not every business object in the application should be directly exposed by the server. This would be a maintenance and configuration nightmare because it would require updating configuration information on all client machines any time a business object is added or changed.
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This is a lesson learned from years of experience with DCOM and MTS/COM+. Exposing large numbers of components, classes, and methods from a server almost always results in a tightly coupled and fragile relationship between clients and the server.
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Instead, it would be ideal if there were one consistent entry point to the application server so that every client could simply be configured to know about that single entry point and never have to worry about it again. This is exactly what the data portal concept provides, as shown in Figure 2-14. The data portal provides a single point of entry and configuration for the server. It manages communication with the business objects while they re on the server running their data access code. Additionally, the data portal concept provides the following other key benefits: Centralized security when calling the application server A consistent object-persistence mechanism (all objects persist the same way) Abstraction of the network transport between client and server (enabling support for WCF, remoting, web services, Enterprise Services, and custom protocols) One point of control to toggle between running the data access code locally or on a remote application server
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CHAPTER 2 FRAMEWORK DE SIGN
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Figure 2-14. The data portal provides a consistent entry point to the application server. The data portal functionality is designed in several parts, as shown in Table 2-4.
Table 2-4. Parts of the Data Portal Concept
Area
Client-side DataPortal Client-side proxy classes Message objects
Functionality
Functions as the primary entry point to the data portal infrastructure, for use by code in business objects Implements the channel adapter pattern to abstract the underlying network protocol from the application Transfers data to and from the server, including security information, application context, the business object s data, the results of the call, or any server-side exception data Exposes single points of entry for different server hosts, such as WCF, remoting, .asmx web services, and Enterprise Services Implements transactional and nontransactional data access behaviors, delegating all actual data access to appropriate business objects
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