Component Diagrams

Introduction to Component Diagrams

Some important aspects related to component diagrams are:

  • Component diagrams model the physical aspects of objects oriented system.
  • They show the organization and dependencies among a set or components where a component is the physical and replaceable part of a system that conforms to and provides the realization of a set interfaces.
  • The model the physical things that reside on a node such as tables files documents etc.
  • These are basically class diagrams that focus on a systems components .

An analogy of Component Diagrams

During  building  of a house, other than blueprints ( which are helpful in  visualizing  specifying and  documents) raw materials and pre built  components ( such as  doors,  window frames, cabinets ,etc,) are required as well. These pre built components are pretty useful  in the  renovation of house.

In case  of software  systems the diagrams  specified by UML have the  following  uses:

  • Use case diagrams depicts the desired behaviour of the system.
  • Class diagrams specify the vocabulary of the domain off the system.
  • Sequence collaboration state chart activity diagrams specify the way the things in the vocabulary of the system work together to carry out the desired behaviour of the system.

During  the implementation of these  diagrams all the  things to be  brought to  life  for example  libraries tables  files document etc, some  of these components  must be built  from scratch  whereas others  may be reused.

In  component diagrams  the  static  aspects of the physical  components  and their  relationships are visualized  and the  details of  their  constructions are specified.

Contents of component Diagrams

These diagrams  contain components  interfaces and relationships  sometimes  package  and sub system may also  present in  these  diagrams.

Users of the Component Diagrams

Component  Diagrams is made  components  that can be assembled in various  ways to produce  a system. These  diagrams  are used for:

  • Modelling source code: Using IDE source codes are stored as files, these diagrams model the management of these files.
  • Modelling executable releases: Using these diagrams the physical part of the software are visualized specified and documented.
  • Modelling systems and database.

Features of a the Component Diagrams

Some  of  the  features of the  component  diagrams are:

  • It is focused on communicating one aspect of a system static implementation view:
  • It encapsulates only those elements that make an easier understanding of that aspect.

Details are provided  which  are relevant only to that  level of abstraction.

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