Implementation Architectures in VS .NET

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Implementation architectures vary according to the degree to which the Web services layer is apportioned value in the overall solution In providing a Web services interface to a database management system, for example, the primary value of the solution remains apportioned within the database layer rather than in the Web services layer The Web services layer becomes one of many options for interacting with the data in the database On the other hand, the Microsoft My Services initiative apportions significant value to the ability of multiple Web services to interact in combination and to create applications differently or more quickly by using them Implementations vary in the value assigned to the Web services layer Because Web services are not executable, much of the value in the development environment, such as J2EE and the NET Framework, remains within the programming languages beneath the Web services Web services represent another means of exchanging information with the application server, which still performs the main job of application development and integration A certain value exists in the Web services layer itself, primarily for integrating, or orchestrating, multiple Web services components, which are implemented using a variety of languages, middleware systems, database management systems, and packaged applications Web services map messages to server objects Figure 8-1 illustrates the Web services implementation architecture in which NET and J2EE application servers expose programs and classes as Web service components The programs and classes represent a variety of back-end technologies accessed using the application server, including Enterprise JavaBeans, NET classes, message queues, and CORBA objects, to name a few
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Figure 8-1 An application server exposes back-end technologies using a Web services interface
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Figure 8-2 illustrates the Web services implementation architecture in which a Web services interface is used to access a database table or a stored procedure This type of access can be thought of as a two-tier architecture, unlike the application server architecture, which includes a middle tier for business logic that is developed and managed independently of the back tier for data access Figure 8-2 A Web Services interface is used to access database tables and stored procedures
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Web services map messages to databases
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Figure 8-3 illustrates the Web services implementation architecture in which a Web services interface maps directly to a queued message system, such as Java Messaging Service (JMS) or MQSeries, or to a B2B server, such as IONA's Orbix E2A Collaborate In both cases, the SOAP message is treated as input to an asynchronous communication system for processing The message is stored in a persistent queue or database and is forwarded to another queue for processing Finally, results are written to a reply queue In this way, Web services represent another way into and out of existing B2B and application-to-application (A2A) integration broker products For an integration broker vendor, the main value remains within the adapters, transformers, routers, and other parts of the toolkit Figure 8-3 In an integration broker architecture, a Web services interface maps to A2A and B2B products
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Figure 8-4 illustrates the Web services implementation architecture for packaged application software such as ERP, CRM, and accounting/billing systems For an ERP or a CRM system, the primary value of the application remains in the features and functions of the software package as related to business operation support Web services, therefore, basically represent another means of getting data in and out, albeit a widely adopted and supported means Packaged-application software vendors, such as Baan, PeopleSoft, SAP, Siebel, and others, also are starting to offer integration products using Web services technology
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Figure 8-4 A Web services interface can be implemented for a packaged application architecture
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Figure 8-5 illustrates the Web services implementation architecture that focuses on the value inherent in the Web services layer A business process flow engine or other means of orchestration lies at the center of the value proposition in this architecture, which depends on the relationship among Web services to achieve or to create new applications at a higher level of abstraction In other words, Web services have value because they are widely adopted and implemented, allowing multiple disparate software domains to be integrated The process of integrating such domains requires certain functionality above the core Web services standards, such as process flow, security, reliable messaging, transactions, and so on Web services brokers, such as IONA's Orbix E2A XMLBus Edition, are built to provide this value In this way, disparate software domains are bridged, multiple vendor Web services implementations are joined, and new applications are created from a combination of old ones Figure 8-5 A Web services broker focuses on value in the Web services layer
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