Component (UML)

Component (UML)
A UML Component with provided and required interfaces

A component in the Unified Modeling Language "represents a modular part of a system, that encapsulates its content and whose manifestation is replaceable within its environment. A component defines its behavior in terms of provided and required interfaces".[1]

A component may be replaced by another if and only if their provided and required interfaces are identical. This idea is the underpinning for the plug-and-play capability of component-based systems and promotes software reuse[1].

As can be seen from the above definition, UML places no restriction on the granularity of a component. Thus, a component may be as small as a figures-to-words converter, or as large as an entire document management system.

Larger pieces of a system's functionality may be assembled by reusing components as parts in an encompassing component or assembly of components, and wiring together their required and provided interfaces."[1] Such assemblies are illustrated by means of component diagrams.

Related terms

  • Package (UML)

References

  1. ^ a b c OMG (2008). OMG Unified Modeling Language (OMG UML), Superstructure, V2.1.2 p.146.

External links

v · d · eUnified Modeling Language
Actors Use case restaurant model.svg

BankAccount1.svg
Restaurant-UML-SEQ.gif
Concepts

Object oriented: Object-oriented programming • Object-oriented analysis and design

Structure: Actor • Attribute • Artifact • Class • Component • Interface • Object • Package • Profile diagram

Behavior: Activity • Event • Message • Method • State • Use case

Relationships: Aggregation • Association • Composition • Dependency • Generalization (or Inheritance)

Extensibility: Profile • Stereotype

Other concepts: Multiplicity
Diagrams
Structural
Behaviour
 
Activity diagram • State Machine diagram • Use case diagram
Interaction
Derived languages
Other topics
Glossary of UML terms • Rational Unified Process • Comparison of UML tools • UML colors

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