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Component Diagram
A Component diagram illustrates the pieces of software, embedded controllers and such that make up a system, and their organization and dependencies.
A Component diagram has a higher level of abstraction than a Class diagram; usually a component is implemented by one or more Classes (or Objects) at runtime. They are building blocks, built up so that eventually a component can encompass a large portion of a system.
You generate Component diagram elements and connectors from the 'Component' pages of the Diagram Toolbox.
Example Diagram
This diagram demonstrates a number of components and their inter-relationships.
Assembly connectors connect the provided interfaces supplied by Product and Customer to the required interfaces specified by Order. A Dependency relationship maps a customer's associated account details to the required interface Payment, also specified by Order.
Component Diagram Element Toolbox Icons
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Description |
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A Packaging Component is an element that appears very similar to a Component in a diagram but behaves as a Package in the Browser window. |
Packaging Component |
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A Component is a modular part of a system, whose behavior is defined by its provided and required interfaces. |
Component |
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A Class is a representation of a type of object that reflects the structure and behavior of such objects within the system. |
Class |
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An Interface is a specification of behavior (or contract) that implementers agree to meet. |
Interface |
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An Object is a particular instance of a Class at run time. |
Object |
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Ports define the interaction between a classifier and its environment. |
Port |
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The Expose Interface element is a graphical method of depicting the required or supplied interfaces of a Component, Class or Part, in a Component or Composite Structure diagram. |
Expose Interface |
Component Diagram Connector Toolbox Icons
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Description |
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An Assembly connector bridges a component's required interface (Component1) with the provided interface of another component (Component2), typically in a Component diagram. |
Assembly |
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A Delegate connector defines the internal assembly of a component's external Ports and Interfaces, on a Component diagram. |
Delegate |
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An Association implies that two model elements have a relationship, usually implemented as an instance variable in one or both Classes. |
Association |
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A source object implements or Realizes its destination object. Realize connectors are used in a Use Case, Component or Requirements diagram to express traceability and completeness in the model. |
Realization |
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A Generalization is used to indicate inheritance. |
Generalization |