Sequence Diagram Example: Concurrent Processes and Activations

The following diagram, based on the diagram appearing on p. 70 of UML Distilled, contains self calls, object activation, self-deleted objects, and asynchronous messages.

Diagram

UML Distilled: Concurrent processes and activations

Diagram Source Code

# UML Distilled: Figure 5-2 p. 70

.PS

copy "sequence.pic";

boxwid = 1.3;

# Define the objects
pobject(X);
pobject(T);
pobject(C);
pobject(A1);
pobject(A2);

# Message sequences
cmessage(X,T,"a: Transaction");
active(T);
async();
cmessage(T,C,"a: TransCoord");
inactive(T);
active(C);
cmessage(C,A1,"a1: TransCheck");
active(A1);
cmessage(C,A2,"a2: TransCheck");
active(A2);
message(A1,C,"ok");
        sync();
        step();
        active(C);
        message(C,C,"all done?");
        inactive(C);
        async();
        step();
delete(A1);
inactive(C);
step();
message(A2,C,"ok");
active(C);
        sync();
        step();
        active(C);
        message(C,C,"all done?");
        inactive(C);
        async();
        step();
delete(A2);
message(C,T,"beValid");
inactive(C);
active(T);
step();

complete(T);
complete(C);

.PE

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