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2: Common Architectures and Protocols
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System architecture corresponds to the concept of architecture as a product. It is the result of a design process for a specific system and must consider the functions of components, their interfaces, interactions, and constraints. This specification is the basis for application design and implementation steps. Defining architecture for a system serves many objectives. It abstracts the description of dynamic systems by providing simple models. In this way, architecture helps the designer define and control the interfaces and the integration of the system components. During a redesign process, the architecture strives to reduce the impact of changes to as few modules as possible. The architectural system model allows the architect to focus on the areas requiring the most change. The architecture indicates the vital system components and constructs that should be adhered to when adapting the system to new uses. Violating the architecture decreases the system s ability to adapt gracefully to changing constraints and requirements. The architecture is a means of communication during the design process. It provides several abstract views on the system, which serve as a discussion basis to crystallize each party s perception of the problem area. Architectures are best represented graphically using a tool such as UML (Unified Modeling Language). An architect communicates the design of the system to other members of the team using UML. Drawing the analogy with the architecture of buildings provides good insight in understanding the characteristics of system architecture, because it shows how architectures provide multiple views and abstractions, different styles, and the critical influence of both engineering principles and materials. A building architect works with a number of different views in which some particular aspect of the building is emphasized. For example, elevations and floor plans give exterior views and top views, respectively. Scale models can be added to give the impression of the building s size. For the builder, the architect provides the same floor plans plus additional structural views that provide an immense amount of detail about various design considerations, such as electrical wiring, heating, and other elements. For the customer of a computer-based information system, the most important views on architecture are those that focus on system performance, user interface, maintainability, and extendability. The architect of the system will be interested in detailed views on resource allocation, process planning, maintenance, monitoring, statistics, and other similar types of information. System architecture can be formulated in a descriptive or prescriptive style. Descriptive style defines a particular codification of design elements and formal arrangements. The descriptive style is used during discussions between the client and the architect. Prescriptive style limits the design elements and their formal arrangements. This style is
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Types of Architecture
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applied in plans used during the construction of a building. The builder, or development team, shall build according to plan. The relationship between engineering principles and architectural style is fundamental. It is not just a matter of aesthetics, because engineering principles are also essential to the project. In a similar way, a reconfigurable computer-based information system cannot be built without a notion of such object-oriented concepts as metadata. In addition, the influence of materials is of major importance in enabling certain architectural styles. Materials have certain properties that can be exploited in providing a particular style. For example, one cannot build a modern, stable skyscraper with wood and rope; concrete and iron are indispensable materials in realizing this construction. 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.
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Reference Architecture
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Reference architecture corresponds to architecture as a style or method. 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. The reference architecture is the basis for designing the system architecture for a particular system. When designing a system according to an architectural style, the architect can select from a set of well-known elements (standard parts) and use them in ways appropriate to the desired system architecture. The JEE architecture is a component-based service architecture. The architect designs the system to utilize the appropriate components for each task. For example, as we will see later in the book, Java ServerPages (JSP) can be used to provide a user view of the system response to a user gesture. This architecture gathers the principles and rules concerning system development in a specific domain to achieve the following:
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n A unified, unambiguous, and widely understood terminology n System architecture design simplicity, possibly allowing less expensive and
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