Component Diagram

 

 

A component diagram is a simple, high-level diagram that shows the organization of and dependencies among a set of components. Component diagrams address the static implementation view of a system.  There is usually a one-to-one relationship between package diagrams and component diagrams.

 

 

           Figure 10.1 Component Diagram

 

 

 

We use component diagram when we model the static implementation view of a system such as modeling source code, executable releases, physical databases, and adaptable systems.

 

 

 

Method 1 ¡V Creating a Component Diagram using the Menu Bar

1.  Click on File on the menu bar. The file menu appears.

2.  Click on New Component on the file menu. A cascading menu appears.

3.  Click on New Component Diagram on the cascading menu. A blank new component diagram appears.

Method 2 ¡V Creating a Component Diagram using the Toolbar

1.  Click on Create New Component Diagram  icon on the toolbar. A blank new component diagram appears.

Method 3 ¡V Creating a Component Diagram using the Project Explorer

1.  Right click on Component Diagram directory in the Project Explorer. A pop-up menu appears.

2.  Click on Create Component Diagram. A blank new component diagram appears.

   Figure 10.2 A blank new component diagram is created

 

	Icon	Notation	Definition
		Note	A note is used for comments additional explanation, specification and requirement in a diagram element or at a link in the diagram. It is not included in generated code.  The contents of a note do not alter the meaning of the model to which it is attached. A note can contain any combination of text and graphics. It can also be used in defining a stereotype and entering a noted element. (adapted from UMLUG-purple)
		Anchor	An anchor is to line a diagram element and a note.
		Dependency	The dependency is a semantic relationship between the two elements. It indicates that when a change occurs in one element, there may be a change necessary to the other element.  A dependency link can include label and stereotype can be set
		Constraint
		Component	A component is a physical and replaceable part of a system that conforms to and provides the realization of a set of interfaces. Components represent all kinds of elements pertaining to the piecing together of software applications. They could be simple files or dynamically loaded libraries.
		Component Instance	Instance of a component.
		Interface	An interface is a collection of operations that are used to specify a service of a class or a component. Each interface often specifies only a limited part of the behavior of an actual class. Characteristics of interface are: (i) do not have internal structure specification; (ii) do not have implementation; (iii) lack of attributes, states and associations; (iv) have operations only; (v) may have generalization relationships.
		Object	Object can be viewed as an entity at a particular point in time with a specific value and as a holder of identity that has different values over time.  Associations among objects are not shown. When you place an object tag in the design area, a lifeline is automatically drawn and attached to that object tag.
		Subsystem	A subsystem groups use cases or packages together.
		Package	A package is a mechanism for organizing elements into groups.  It is used in the Use Case, Class, and Component diagrams.  Packages may be nested within other packages. A package may contain both subordinate packages and ordinary model elements.  The entire system description can be thought of as a single high-level subsystem package with everything else in it.

   Table 2 The Component Diagram Palette of VPUML

 

Method 1 ¡V Creating a component using the diagram palette

1.    To create a component in your component diagram, click on the Component button  on the diagram palette and click on the desire location. A component appears.

 

2.    Rename the component name, and then press Ctrl + Enter to set the component name.

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3.    The component name is set.

 

Method 2 ¡V Creating a component using the resource centric interface

Diagram element that a component can be created from, using the resource centric interface is:

l Component

 

1.  Click on the component. The resource icons appear around the diagram element.

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2.  Press mouse button on the Component resource icon. A new component appears.

 

 

3.  Drag the component to the desired location. The component is created.

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Method 1 ¡V Creating a Component Instance using the diagram palette

To create a Component Instance in your component diagram, click on the Component Instance button  on the diagram palette and click on the diagram window. A component instance appears.

 

1.  Rename the newly created Component Instance name, and then press Ctrl + Enter to finish the operation.

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2.  The Component Instance name is set.

 

Method 2 ¡V Creating a Component Instance using the resource centric interface

Diagram element that a component instance can be created from, using the resource centric interface is:

l Component Instance

 

1.  Click on an existing component instance. The resource icons appear around the diagram element.

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2.  Press on the Component Instance resource icon. A new component instance appears.

 

 

3.  Drag the component instance to the desired location. Release the mouse button. The component instance is created.

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Method 1 ¡V Creating an Interface using the diagram palette

1.  To create an Interface in your component diagram, click on the Interface icon  on the diagram palette and then click on the desired location on the diagram. A new interface is created.

 

2.  Rename the newly created interface name. Press Ctrl + Enter to finish the operation.

 

3.  The Interface name is set.

 

Method 2 ¡V Creating an Interface using the resource centric interface

Diagram elements that an interface can be created from, using the resource centric interface are:

l Component

l Component Instance

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1.  Press on the Interface resource icon. A new interface appears.

 

 

2.  Drag the interface to the Component or Component Instance that you want the interface to be placed in. Release the mouse button. The Interface is created.

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