Designing Software in .NET

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Designing Software
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basic logic Remember when every manager suddenly wanted every business application to have a Web-based user interface It was a relatively painless process for all the developers who had built their applications with an independent presentation layer
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Business Logic Layer
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The business logic layer is responsible for the business logic of the application It contains all of the business classes The business logic layer includes code for the business rules, de ned as methods, and for management of business data, de ned as properties It does not include user interface elements, such as message boxes You can divide the business logic layer into two layers if you want to further separate the business logic itself from the code that creates and populates the business object The separate code that creates a business object is sometimes called an object factory
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NOTE: If you have read any of my older Doing Objects books, I called these classes business object data transfer (BODT) classes
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The business logic layer never directly accesses the database Instead, it accesses the data layer to obtain the data it needs For example, in the Purchase Tracker application, the Customer, Product, and Purchase classes are created in the business logic layer 5, Building the Business Logic Layer, demonstrates building a business logic layer as a separately compiled project By encapsulating all the business logic and business rules in logically organized classes in the business logic layer, you can more easily develop, enhance, and extend the application s logic with minimal impact on the other layers
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Data Access Layer
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The data access layer is responsible for accessing the application data, whether that data resides in a le or in a database It knows where to nd the data, how to retrieve it, and how to update it The data access layer includes the code required to retrieve and save the application data The data access layer does not include business logic Instead, that logic resides in the business logic layer
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NOTE: There are some exceptions to this For example, there are cases in which efficiency is gained from having some business logic in stored procedures in the database, especially if the logic is database-intensive
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For example, in the Purchase Tracker application, the majority of the application data is stored in a database, so a generalized data access class is built in the data access layer This class retrieves and saves the application data in the database 8, Building the Data Access Layer, builds a simple data access class as a separately compiled project By using a data access class, you can more easily modify how the data is stored or accessed without impacting the remaining layers of the application And if you make this class generalized, you can reuse it in every application that accesses a database
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Service-Oriented Architecture (SOA)
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A section on architecture would not be complete without mentioning a Service-Oriented Architecture (SOA) SOA is an architectural style whereby loosely coupled applications provide services to each other A service is a task performed by a service provider for a service consumer The easiest example is a payment processing service to handle credit cards or other types of payments If you write an application that needs to accept payment, you most likely won t process that payment yourself Instead, you make arrangements to use a payment processing service that can provide secure credit card processing Some designers like to think about SOA on a micro level whereby every application is a system of services The data access layer provides a service to the business logic layer, the business logic layer provides a service to the user interface layer, and so on You can think of your application in this manner However, you most likely would not want to develop it this way Because of its requirement for loose coupling, the communication between the service provider and service consumer is much more complex than just calling a method on an object You have to assume that the service provider and service consumer could be on different machines and possibly written in different languages on different operating systems That is why SOA is frequently implemented as Web Services It is best to think about SOA on a macro level Instead of thinking about your application as a set of services it provides to itself, think about
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