Pascal's Triangle by Vladimir Andreevich Uspenski

By Vladimir Andreevich Uspenski

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On a large project, they work with the system designers, team leads, enterprise modelers, developers, testers, QA staff, configuration experts, and business domain experts. On a small team, architects may be playing one or more of these roles. Architects are responsible for interacting with customers, beta testers, and end users to make sure that user requirements are satisfied. Architecture vs. Design An architect is not a designer. An application architecture’s scope is the system’s major structure, its architectural design patterns, and the frameworks upon which you can add components.

Like high-tech building architecture, Internet/Intranet-enabled information system architectures currently under development rely on recent technologies (such as fast networks and distributed processing); such systems could not have been developed in the past. ” It refers to a coherent design principle used in a specific domain. Examples of such architectures are the Gothic style for building and the Java Enterprise Edition (JEE) model for computerbased information systems. This architecture describes the kinds of system components and their responsibilities, dependencies, possible interactions, and constraints.

What makes it possible to swap one layer for another is a well-known layer interface protocol—the Internet Interoperability Protocol (IIOP)—that lies between the layer and both its upper and lower adjacent layers. Tiers In a multi-tier environment, the client implements the presentation logic (thin client). The business logic is implemented on an application server(s), and the data resides on a database server(s). The following three component layers thus define a multi-tier architecture: n A front-end component, which is responsible for providing portable presentation logic, such as an web server n A back-end component, which provides access to dedicated services, such as a database server 38 Chapter 2: Common Architectures and Protocols n A middle-tier component(s), which allows users to share and control business logic by isolating it from the actual application, such as an application server Figure 2-5 shows a three-tiered architecture.

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