لطفا منتظر باشید ...
5.4 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.
Figure 5-12. Communication associations
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, the
Data component could not be related to the
Security component, and the
Business Processing component
could not be related to the IProducible and
IConsumable interfaces.
Figure 5-13. Communication associations
