Three Concepts of System Architecture
نویسندگان
چکیده
An architecture is a speci cation of the components of a system and the communication between them. Systems are constrained to conform to an architecture. An architecture should guarantee certain behavioral properties of a conforming system, i.e., one whose components are con gured according to the architecture. An architecture should also be useful in various ways during the process of building a system. This paper presents three alternative concepts of architecture: object connection architecture, interface connection architecture, and plug and socket architecture. We describe di erent concepts of interface and connection that are needed for each of the three kinds of architecture, and di erent conformance requirements of each kind. Simple examples are used to compare the usefulness of each kind of architecture in guaranteeing properties of conforming systems, and in correctly modifying a conforming system. In comparing the three architecture concepts the principle of communication integrity becomes central, and two new architecture concepts, duality of sub-interfaces (services) and connections of dual services (service connection), are introduced to de ne plug and socket architecture. We describe how these concepts reduce the complexity of architecture de nitions, and can in many cases help guarantee that the components of a conforming system communicate correctly. The paper is presented independently of any particular formalism, since the concepts can be represented in widely di ering architecture de nition formalisms, varying from graphical languages to event-based simulation languages.
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تاریخ انتشار 1995