DEV475 Mastering Object-Oriented Analysis and Design with UML ...

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DEV475 Mastering Object-Oriented Analysis and Design with UMLResilient Component-Based ArchitecturesResilient Component-Based Architectures• Resilient• Meets current and future requirements• Improves extensibility• Enables reuse• Encapsulates system dependencies• Component-based• Reuse or customize components• Select from commercially available components• Evolve existing software incrementallyMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved16Architecture is a part of Design. It is about making decisions on how the system willbe built. But it is not all of the design. It stops at the major abstractions, or, in otherwords, the elements that have some pervasive and long-lasting effect on systemperformance and ability to evolve.A software system’s architecture is perhaps the most important aspect that can beused to control the iterative and incremental development of a system throughout itslifecycle.The most important property of an architecture is resilience –flexibility in the face ofchange. To achieve it, architects must anticipate evolution in both the problemdomain and the implementation technologies to produce a design that can gracefullyaccommodate such changes. Key techniques are abstraction, encapsulation, andobject-oriented Analysis and Design. The result is that applications are fundamentallymore maintainable and extensible.1 - 16
Module 1 - Best Practices of Software EngineeringPurpose of a Component-Based ArchitecturePurpose of a Component-Based Architecture• Basis for reuse• Component reuse• Architecture reuse• Basis for project management• Planning• Staffing• Delivery• Intellectual control• Manage complexity• Maintain integrityComponent-basedarchitecture withlayersBusinessspecificApplicationspecificSystemsoftwareMiddlewareMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved17Definition of a (software) component:RUP Definition: A nontrivial, nearly independent, and replaceable part of a systemthat performs a clear function in the context of a well-defined architecture. Acomponent conforms to and provides the physical realization of a set of interfaces.UML Definition: A physical, replaceable part of a system that packagesimplementation, and that conforms to and provides the realization of a set ofinterfaces. A component represents a physical piece of the implementation of asystem, including software code (source, binary, or executable) or equivalents such asscripts or command files.1 - 17
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