Software architecture and design (IX) -- component based architecture

Component based architecture

Component based architecture focuses on decomposing the design into independent functional or logical components , These components represent containing methods , Well defined communication interface for events and attributes . It provides a higher level of abstraction , And divide the problem into sub problems , Each is associated with a component partition .

The main goal of component-based architecture is to ensure the reusability of components . Components encapsulate the functions and behaviors of software elements into reusable and self deployable binary units . There are many standard component frameworks , Such as COM / DCOM,JavaBean,EJB,CORBA,.NET,Web Services and grid services . These technologies are widely used in local desktops GUI Application design , As in Figure JavaBean Components ,MS ActiveX Components and COM Components , It can be reused through simple drag and drop operations .

Component oriented software design has many advantages over traditional object-oriented methods , Such as -

• By reusing existing components , Shorten the market time and development cost .

• Improve reliability by reusing existing components .

What is a component ？

Component is a kind of modularity , portable , A well-defined set of functions that can be replaced and reused , It encapsulates its implementation and exports it as a higher-level interface .

A component is a software object , Designed to interact with other components , Encapsulate certain functions or a group of functions . It has a clearly defined interface , And comply with the recommended behavior common to all components in the architecture .

Software components can be defined as composite units with contractually defined interfaces and explicit context dependencies . in other words , Software components can be deployed independently , And consists of third parties .

Component view

Components can have three different views - Object oriented view , General views and process related views .