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6.2 Messages and Stimuli
As discussed in Chapter 2, communication
from a sender object to a receiver object
via a link is called a stimulus, and
communication from a sender class to a receiver class via an
association is called a message. A stimulus is
an instance of a message much the way an object is an instance of a
class and a link is an instance of an association. For example, the
objects in Figure 6-5 and Figure 6-7 would exchange stimuli and the classes in
Figure 6-4 and Figure 6-6 would
exchange
messages.
The sender object (or class) is known as the
client, and the receiver object (or class) is
known as the supplier.Within an interaction and collaboration,
messages
are exchanged between a sender class role and a receiver class role
via an association role, and stimuli are exchanged between a sender
object playing a class role and a receiver object playing a class
role via a link playing an association role. For example, Figure 6-4 and Figure 6-6 show that
class roles would exchange messages via association roles, and Figure 6-5 and Figure 6-7 show that
objects playing class roles would exchange stimuli via links playing
association roles. As discussed in Chapter 2, in
the object-oriented paradigm, communication from a sender to a
receiver is used to convey information or request processing.
