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Software component
A software component is a modular unit of software that encapsulates specific functionality. The desired characteristics of a component are reusability and maintainability.
Components allow software development to assemble software with reliable parts rather than writing code for every aspect; allowing for implementation to be more like factory assembly than custom building.
Desirable attributes of a component include but are not limited to:
Some components are built in-house by the same organization or team building the software system. Some are third-party, developed elsewhere and assembled into the software system.
For large-scale systems, component-based development encourages a disciplined process to manage complexity.
Some components conform to a framework technology that allows them to be consumed in a well-known way. Examples include: CORBA, COM, Enterprise JavaBeans, and the .NET Framework.
Component design is often modeled visually. In Unified Modeling Language (UML) 2.0 a component is shown as a rectangle, and an interface is shown as a lollipop to indicate a provided interface and as a socket to indicate consumption of an interface.
The idea of reusable software components was promoted by Douglas McIlroy in his presentation at the NATO Software Engineering Conference of 1968. (One goal of that conference was to resolve the so-called software crisis of the time.) In the 1970s, McIlroy put this idea into practice with the addition of the pipeline feature to the Unix operating system.
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Software component
A software component is a modular unit of software that encapsulates specific functionality. The desired characteristics of a component are reusability and maintainability.
Components allow software development to assemble software with reliable parts rather than writing code for every aspect; allowing for implementation to be more like factory assembly than custom building.
Desirable attributes of a component include but are not limited to:
Some components are built in-house by the same organization or team building the software system. Some are third-party, developed elsewhere and assembled into the software system.
For large-scale systems, component-based development encourages a disciplined process to manage complexity.
Some components conform to a framework technology that allows them to be consumed in a well-known way. Examples include: CORBA, COM, Enterprise JavaBeans, and the .NET Framework.
Component design is often modeled visually. In Unified Modeling Language (UML) 2.0 a component is shown as a rectangle, and an interface is shown as a lollipop to indicate a provided interface and as a socket to indicate consumption of an interface.
The idea of reusable software components was promoted by Douglas McIlroy in his presentation at the NATO Software Engineering Conference of 1968. (One goal of that conference was to resolve the so-called software crisis of the time.) In the 1970s, McIlroy put this idea into practice with the addition of the pipeline feature to the Unix operating system.