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Learning UML
book

Learning UML

by Sinan Si Alhir
July 2003
Beginner
256 pages
6h 28m
English
O'Reilly Media, Inc.
Content preview from Learning UML

Communication Associations

Figure 5-3 shows nodes associated with the project management system, but how are those nodes related? A specialized type of association, called a communication association, addresses the question of how nodes are related. (Associations are discussed in Chapter 3.)

A communication association between nodes indicates a communication path between the nodes that allows components on the nodes to communicate with one another. A communication association is shown as a solid-line between nodes. Figure 5-12 shows that the Business-Processing Server has a communication association with the Desktop Client, Printer, and Database Server nodes.

Communication associations

Figure 5-12. Communication associations

Figure 5-13 combines Figure 5-8 and Figure 5-12 to show how components are related to nodes. Notice that if two components are related and reside on different nodes, the nodes must have a communication association between them to allow the components to communicate; otherwise, the components are not able to communicate and be related to one another. For example, if the communication association between the Desktop Client and Business-Processing Server nodes was removed, the User Interface component could not be related to the IBusiness Processing interface and Security component. If the communication association between the Business-Processing Server and Database Server nodes was removed, ...

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Publisher Resources

ISBN: 0596003447Catalog PageErrata