LOGICAL ARCHITECTURE REFINEMENT IN OOAD PDF

The logical architecture is the large - scale organization of the software classes into packages or namespaces , subsystems, and layers. It's called the logical architecture because there's no decision about how these elements are deployed across different operating system processes or across physical computers in a network these latter decisions are part of the deployment architecture. A layer is a very coarse - grained grouping of classes, packages, or subsystems that has cohesive responsibility for a major aspect of the system. Also, layers are organized such that "higher" layers such as the UI layer call upon services of "lower" layers, but not normally vice versa. Typically layers in an 00 system include:. In a strict layered architecture , a layer only calls upon the services of the layer directly below it.

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The logical architecture is the large - scale organization of the software classes into packages or namespaces , subsystems, and layers. It's called the logical architecture because there's no decision about how these elements are deployed across different operating system processes or across physical computers in a network these latter decisions are part of the deployment architecture. A layer is a very coarse - grained grouping of classes, packages, or subsystems that has cohesive responsibility for a major aspect of the system.

Also, layers are organized such that "higher" layers such as the UI layer call upon services of "lower" layers, but not normally vice versa. Typically layers in an 00 system include:. In a strict layered architecture , a layer only calls upon the services of the layer directly below it. This design is common in network protocol stacks, but not in information systems, which usually have a relaxed layered architecture , in which a higher layer calls upon several lower layers.

For example, the UI layer may call upon its directly subordinate application logic layer, and also upon elements of a lower technical service layer, for logging and so forth. A logical architecture doesn't have to be organized in layers. But it's very common, and hence, introduced at this time. Exploring design of the other layers such as the UI layer will focus on the design of their interface to the application logic layer.

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Logical architecture refinement

Logical Architecture. A package is a UML construct that enables you to organize model elements, such as use cases or classes, into groups. Packages are depicted as file folders and can be applied on any UML diagram. Guidelines for Class Package Diagrams. Reference source not found. In addition to the package guidelines presented below, apply the following heuristics to organize UML Class diagrams into package diagrams:.

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4.Logical Architecture Refinement

Logical Architecture Refinement. Software design is an iterative development, and it is normal to create a design of layers that starts simple, and evolves over the iterations of the elaboration phase. It is essential to have the core architecture established designed and implemented by the end of the iterations in elaboration, but this does not mean doing a large up-front speculative architectural design before starting to program. Rather, a tentative logical architecture is designed in the early iterations, and it evolves incrementally through the elaboration phase. Page 1. There are other types in these packages; only a few packages are shown to indicate noteworthy aspects.

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What is the Logical Architecture? And Layers? - UML

We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you! May cause erroneous interrepretation. Ports: a set of single direction communication channels between the module and its environment Network link: sub module ports are connected together to form communication channels. External behaviors of the sub-modules plus the network and interface links must imply the external behavior of composite module 2.

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