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A Widely Distributed Service Application
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Web Services can be used to provide a service layer to widely distributed clients. This application deploys a data access layer to the IIS box running Web Services, and uses ASP .NET session state to manage logins and state information (see Figure 1-6). This service layer is then
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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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leveraged by Windows Forms and Web applications distributed across several North American locations. Web Service extensions are leveraged to encrypt authentication and sensitive data on the wire.
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Figure 1-6. A service application deployed to the World Wide Web The data access layer leverages the Data Access Application Block, which is part of a downloadable package called Enterprise Services. This set of services ships with all the source code, and so can be customized. The Data Access Application Block ships with support for SQL Server, Oracle, and DB2. DB2 requires the managed provider available from IBM. There is also a stateful business object layer used within the Windows Forms user interfaces and during the processing of a request for an ASP .NET page. It s good to use stateful objects within a process boundary; you need stateless objects when services could possibly be deployed to different machines, processes, or even app domains. Web Services are designed as a stateless service layer. This is considered to belong to the middle tier of a distributed application, but has a very different design than a typical stateful type designed with the principles described by OOAD. The funny thing about SOAP the Simple Object Access Protocol, is that it is not at all , object oriented. Services designed to be exposed using SOAP messages actually look a lot more like traditional procedure function calls might: atomic methods that accept large parameter lists that perform their work based entirely upon the information passed to them, and when finished, are destroyed completely (see Figure 1-7, the class on the right).
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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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Figure 1-7. Chunky vs. chatty design in logical application layer designs This is what it means to be stateless. There are no fields in the object sense. A service class has no variables declared that have class level scope. There d be no point to it, as instances of a service type don t necessarily survive across requests, even if they re two requests from the same client. If object pooling, or especially if just-in-time activation, is used, then objects must be stateless. If they re not, then state information could be passed from one user to another as instances are grabbed out of the pool. This would yield unpredictable results at best, behavior that could only fairly be described as a bug. This is what it means for an interface to be chunky. Chatty interfaces are also sometimes called fine grained, while chunky can also be called coarse grained (see Figure 1-7). SOAP is also not necessarily simple. This has proven to be such a poor acronym that the W3C has started saying it s not an acronym at all. It s just SOAP They ve renamed it the XML . Protocol (as if they can unacronymize something. That d be like verbing the word acronym). They should have gone with the Service Oriented Architecture Protocol. That works, doesn t it This service layer sits in front of another generalized stateless layer that acts as the entry point to the data access layer. This layer exposes types, whose methods each map directly to a stored procedure living within DB2. The service layer may aggregate calls to different methods on this data access layer. It may even create several different types from the data access layer, and aggregate the results to prepare an entire result set to send back to the client. This is called service aggregation, and it s a common pattern at this public level of a service layer, as it s designed to minimize round trips from the client to the server. The service layer aggregates data that meets the requirements of a specific user interface. Reuse is gained at the data access
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