Components Base Development Overview

objectives “ The whole is greater than the sum of the parts; the part is greater than a fraction of the whole.” Aristotle

Component Based development for complex systems Develop large software systems like : Hardware Car Manufacturing rather than engineering Product line Assembly line Tools chain Development Phase Production Phase time Engineering Product line Reuse

Develop large software systems like :

Hardware

Car

Manufacturing rather than engineering

Product line

Assembly line

Tools chain

Components Assembly

Abstraction Level Components in a SW architecture can be identified at different levels of abstraction, and the components identified at these different levels may not be in one-to-one correspondence. For example, viewing an architecture at one level of abstraction, object services may be identified as components. Viewing the same architecture at a more detailed level, a given service may be implemented by several distinct software modules, which may be individually identified as components.

Components in a SW architecture can be identified at different levels of abstraction, and the components identified at these different levels may not be in one-to-one correspondence.

For example, viewing an architecture at one level of abstraction, object services may be identified as components.

Viewing the same architecture at a more detailed level, a given service may be implemented by several distinct software modules, which may be individually identified as components.

Definition “ A software component is a unit of composition with contractually specified interfaces and explicit context dependencies only. Software component can be deployed independently and is subject to composition by third parties.” Clemens Szyperski

“ A software component is a unit of composition with contractually specified interfaces and explicit context dependencies only. Software component can be deployed independently and is subject to composition by third parties.”

Clemens Szyperski

Component interfaces and dependencies Contractual Interface Required Interface Platform Interface Contextual Dependencies

Component contractual interfaces Contractual Interface Client Server

Component instance component Component instance anObject aClass

Component orchestration Create() Remove() Connect() Disconnect()