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Another trick I often use is to consolidate trivial messages such as getter invocations.
In I modeled the series of getter method invocations to obtain the information needed to display the list of students enrolled in a seminar as the single message get Info.
Notice how a recursive connection, or a self connection, is required so that student can do this.
Although Figure 1 applies sequence numbers to the messages, my experience is if you feel the need to use sequence numbers on communication diagrams this is a good indication you should be using sequence diagrams instead. In Figure 1 you see the Seminar Details user interface object collaborates with the seminar object to obtain the information needed to display its information.
Communication diagrams seem to be preferred by people with a “structure bent”, people that focus on UML class diagrams or class responsibility collaborator (CRC) cards, because of the similarity of communication diagrams with those types of artifacts.
As always, follow the AM practice Apply the Right Artifact(s) and use the most appropriate technique for your situation.
Better yet I try to find a new name for the message (remember, messages map to operations implemented by your classes).
The details of your associations, such as their multiplicities, are not modeled because this information is contained on your UML class diagrams: remember, each UML diagram has its own specific purpose and no single diagram is sufficient on its own. Figure 2 summarizes the basic notation for modeling messages on communication diagrams. In Figure 1 message 1 is sent to the Seminar object which in turn sends messages 1.1 and then 1.2 to the Course object.
Messages are depicted as a labeled arrow that indicates the direction of the message, using a notation similar to that used on sequence diagrams. Optionally, you may indicate the sequence number in which the message is sent, indicate an optional return value, and indicate the method name and the parameters (if any) passed to it. Message 5 is sent to the Seminar object, which sends message 5.1 to enrollment, which in turn sends message 5.1.1 to student, and it finally sends message 22.214.171.124 to itself.
Have a look to our detailed use case stories to learn how Papyrus has been applied to enable MBE in practice: As part of Polarsys (the Industrial Working Group of Eclipse), Papyrus has become a Polar Sys Solution.
In addition, in order to federate the industrial needs and efforts on MBE, a Papyrus Industry Consortium has been setup.