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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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layer, whose services aren t so tightly coupled to the requirements of a specific application, but instead more generally map to different entities stored in the database. The data access layer is what accepts a list of method arguments and transforms them into the parameter objects and types defined at the database level. This creates a layer of abstraction between the service consumer, who deals only in types defined in the .NET Framework s Common Type System, and the relational database, whose types depend on the database vendor. This is the layer that calls the Data Access Application Block. This layer may be so generalized as to lend itself to code generation in many cases. Given the definition of a stored procedure, the method to wrap that stored procedure could be generated using types from the CodeDom namespace and schema information from the relational database. We cover Web Services in 6, with more on SOAP in 8. We discuss the Data Access Layer Application Block, part of the Enterprise Library, in 11.
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Durability and reliability are the main concerns of the architecture presented in Figure 1-8. MSMQ and COM+ Queued Components are used to accomplish this. Clustering was not an option considering the budget on this example project, and so to provide for availability of the data access layer, MSMQ and database triggers are leveraged to programmatically synchronize the data in these redundant servers. This architecture is based entirely on XML. All of the controls in the user interface represent their state as XML documents, and it s XML that gets packed into the body of the MSMQ messages. Users of this application don t have a very fast connection, so page sizes are kept to a minimum. This means page developers will likely favor caching data on the web server to rebind a control like a grid across postbacks, rather than rely on ViewState to maintain this information on the client (see 4). The data access layer on the web server needs to support asynchronous operations. Commands that modify the data are sent to the data access abstraction layer, which doesn t actually execute the command, but packs the XML representing the request into the body of an MSMQ message. This message is then placed in a queue, and execution continues in the call stack on the web server. This means that the web server responses don t wait for the database work to be done before sending a result to the user. Users see a message that their requests were sent and to check back later for results. See 8 for MSMQ examples. Of course, sometimes synchronous access to the database is critical. When users want to see data, you cannot tell them that a request for the data they want to see has been submitted, and to come back later to see it. For synchronous requests for data, you use a simple timeout listener loop within the data access abstraction layer. This monitors an incoming MSMQ for a correlated result message, sent back from the queue listener when the work has been completed. This architecture makes it very easy to put in a timeout should the request take too long. This timeout period can (and should) be controlled by a configuration file. With a 10-second timeout specified in the configuration file, users get an error or warning message if they wait any longer for a message to appear in the response queue.
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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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Figure 1-8. A highly available MSMQ architecture Once the message has been placed in the outgoing queue, a listener picks it up and processes it from there. In this architecture, the queue listener extracts the body of the message and posts it to SQLXML as a SOAP request for a Web Service. This facility is built into SQLXML. Any stored procedure can easily be exposed with SQLXML listening for incoming SOAP requests and automatically mapping them to the database stored procedure. After the database work is complete, a response message may be prepared, depending on whether the request was synchronous or not. For asynchronous requests, a fire and forget model is used, and so no response message is necessary. One major benefit of this architecture is that other non-web applications could leverage the same MSMQ infrastructure (i.e., Windows Services, BizTalk Orchestration). The initiating application need only know how to generate the transaction XML, and then throw it in the queue. The listener takes over from there.
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