The learning objectives for this chapter include: To explain that CBSE is concerned with developing standardised components and composing these into applications, to describe components and component models, to show the principal activities in the CBSE process, to discuss approaches to component composition and problems that may arise. | Component-based software engineering Objectives To explain that CBSE is concerned with developing standardised components and composing these into applications To describe components and component models To show the principal activities in the CBSE process To discuss approaches to component composition and problems that may arise Topics covered Components and component models The CBSE process Component composition Component-based development Component-based software engineering (CBSE) is an approach to software development that relies on software reuse. It emerged from the failure of object-oriented development to support effective reuse. Single object classes are too detailed and specific. Components are more abstract than object classes and can be considered to be stand-alone service providers. CBSE essentials Independent components specified by their interfaces. Component standards to facilitate component integration. Middleware that provides support for component . | Component-based software engineering Objectives To explain that CBSE is concerned with developing standardised components and composing these into applications To describe components and component models To show the principal activities in the CBSE process To discuss approaches to component composition and problems that may arise Topics covered Components and component models The CBSE process Component composition Component-based development Component-based software engineering (CBSE) is an approach to software development that relies on software reuse. It emerged from the failure of object-oriented development to support effective reuse. Single object classes are too detailed and specific. Components are more abstract than object classes and can be considered to be stand-alone service providers. CBSE essentials Independent components specified by their interfaces. Component standards to facilitate component integration. Middleware that provides support for component inter-operability. A development process that is geared to reuse. CBSE and design principles Apart from the benefits of reuse, CBSE is based on sound software engineering design principles: Components are independent so do not interfere with each other; Component implementations are hidden; Communication is through well-defined interfaces; Component platforms are shared and reduce development costs. CBSE problems Component trustworthiness - how can a component with no available source code be trusted? Component certification - who will certify the quality of components? Emergent property prediction - how can the emergent properties of component compositions be predicted? Requirements trade-offs - how do we do trade-off analysis between the features of one component and another? Components Components provide a service without regard to where the component is executing or its programming language A component is an independent executable entity that can be made up of one or more executable objects; The .
