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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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Here is a typical simple architecture for a smaller application with a single data store that s not expecting hundreds of concurrent users (see Figure 1-2). All of the components are managed types. The ASP .NET pages use standard controls built into the Framework that generate W3C-compliant HTML. This allows the application to be deployed to any platform or operating system that supports a web browser. The pages use what could be a stateful business object layer, but the application is simple enough that only a few of these stateful types are actually needed. The business object layer, in turn, leverages a data access layer written using the Data Access Application Block and calling SQL Server stored procedures.
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Figure 1-2. A simple architecture for a managed web application In some cases, the UI layer calls the data access layer directly. Although this is a violation of the guidance provided by the layering pattern, in this case, it s acceptable as the business rules aren t that complex and, in many cases, would be nothing more than a pass-thru layer, providing nothing but an additional level to the call stack and bloating your code base, assembly sizes, and heap allocations unnecessarily.
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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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Even with this simple design, this application could scale out to handle additional load in the future. The requirements for what needs to be managed in state are minimal enough that they re easily implemented using cookies (good only for small amounts of data), and the database (more coding, but it s persistent, scalable, and available). Access to the database is synchronous, so any long-running queries would incur a delay in the responsiveness of the application for the user, as there s nothing in this design to address asynchronous operations. The recovery plan, should the server go down, is to drive to the office as fast as possible and repair or replace the machine. This results in a low availability guarantee, which is acceptable because the application isn t mission critical. Any requests in-process during a system crash would be lost. Deployment of new versions and fixes for this application are worry free. State information is tracked in the database, and correlated to users with a cookie value. Both of these stores survive the reboot of a web server. This architecture would obviously not work for all applications. There are a number of serious limitations. However, when the requirements are met by this solution, it s an excellent choice, because developing applications like these are extremely fast and very easy to learn, compared to a lot of n-tiered applications. We discuss strategies for reuse of code in the web presentation tier in 3. We cover using ADO.NET effectively in 10. And we examine the Data Access Layer Application block, a part of the Enterprise Library, in 11.
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Component Services, or COM+, provides a rich set of features in a component-hosting environment, such as distributed transactions, just-in-time activation, object pooling, and asynchronously queued components. In 7, we examine these features in detail. Even though Component Services is a COM-based technology, Microsoft has added facilities to the .NET Framework that allow managed types to be easily configured for use within this environment. When you create .NET types that can be hosted under Component Services, they are called Serviced Components. Here s a logical view of an architecture that uses Serviced Components (see Figure 1-3). The critical feature of Component Services being leveraged from this architecture is its ability to automatically roll back transactions that span several data sources. Even if the data isn t hosted on the same server or on the same vendor platform, the Distributed Transaction Coordinator will automatically manage and then commit or roll back work that spans different data stores.
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