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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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However, this did not solve the problem of interoperability. With everyone writing their own SOAP stacks, interoperability could only be achieved between groups that had direct buy-in to the design. What was needed was an industry-wide specification that could provide a standards-based approach of how to attain platform interoperability. The standards bodies went to work. And work. And work. And work. It took so long for the W3C to come up with the standard for XML Schemas that Microsoft invented their own, called XML Schema Reduced (XDR). We ll ditch this when the W3C is done, and we ll support the standard, we swear! Right now, we just need to ship some product! When XML Schema was finally complete, Microsoft did adopt it. They even provided migration tools to move from XDR to XML Schema, but as with all things that get adopted (think ODBC), XDR lingers. Microsoft currently supports them both. The standards bodies worked on the specs for XML Messaging for so long that the rankand-file IT masses wrote it off. Yeah, yeah, yeah. It s another flash-in-the-pan technology. Remember Microsoft Bob Remember My Services Eventually the W3C adopted SOAP (and renamed it the XML Protocol ). It finalized the spec for the Web Service Description Language (WSDL). The OASIS group created a specification for discovery it dubbed the Universal Description, Discovery, and Integration protocol (read: search engine for services: UDDI). The funny thing is, in the last couple of years the standards have become ready for prime time. Designs for new things require time and iterations. The first iteration is done and over with. The specs have been adopted and vendors have done a couple of implementations. They ve realized what doesn t work and created stacks that do. Folks are adopting parts of the SOAP spec in favor of others because they ve tried them both and know from experience what works. The enterprises that wrote their own stacks years ago now have vendor-supplied tools that provide a standards-based SOAP Stack implementation. It works. And it is going to transform the way applications are created, deployed, and consumed. It just took awhile. Today implementing your own SOAP Stack would be like implementing your own database transaction processing. You d be reinventing the wheel, as there s already a stack available for your platform (regardless of what that is). When you re using .NET, there s a SOAP stack built into the ASP .NET Framework. Remember that engineer who wrote the custom SOAP stack for the product he was working on in the late nineties Today he s the program manager for XML Web Services at a little company out west, in Redmond, Washington, I believe. Guess that vision thing works out sometimes. It just doesn t always happen right away.
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The following diagram is a fairly complete picture of the common options available to the system architect for .NET applications (see Figure 1-1). This diagram captures some of the technologies you can employ on the individual tiers, as well as some of the different technologies you can use to marshal messages across these tiers. For example, the data access layer (DAL) may be on the client for a Windows application deployed to two physical tiers. At the data access layer of the system, if you re using SQL Server, or some other native relational database management system (RDBMS) communication protocol from other vendors, communication can occur with the RDBMS via Tabular Data Stream (TDS).
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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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Figure 1-1. .NET solutions While not any .NET application will make use of all of the choices, all of them will make use of some. This book has ASP .NET 2.0 in the title, but we re going to examine ASP .NET in a broader scope than that of its role in the presentation tier. ASP .NET is an application server. IIS listens for incoming HTTP requests and maps them to processes that do all manner of work, and are not limited to generating HTML. To consider ASP .NET as being synonymous with Web Forms is severely limiting. Web Forms (ASPX pages) are but a small part of the functionality that ships with the Framework, and a narrow means of extending the functionality. ASP .NET acts as a host for Web Services, for remoted components, and for Component Services, and when Windows Communication Foundation ships there will be a host of choices there as well. We ve dedicated chapters to each of these topics. Figure 1-1 does not attempt to capture the role of Windows Communication Foundation or SQL Server 2005. For details on how these technologies fit into the picture, see the chapters on these topics specifically ( 9 and the latter part of 11). Let s take a look at how a few different architectures might look in production. There are a lot of different services, a lot of different requirements, and lot of ways to put it all together. A few fictitious architectures are created here for discussion, based on solutions that have proven to be effective in production environments.
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