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Interaction Diagrams (what? (Shows the interaction and message exchanges…
Interaction Diagrams
what?
Shows the interaction and message exchanges of objects
within
the system
Interaction diagrams are created by designers
Interaction diagrams are also use case specific
First message always comes from the outside world.
Actors are not shown in interaction diagrams
Types
collaboration diagram also known as communication diagram
interactions are represented between anonymous objects
interactions are in a graph or network format
Every message is numbered to indicate the sequence of messages.
objects does not have any arrangement
Sequence diagram
Objects are arranged in parallel
Objects have dotted vertical lines indicating life lines
Message interactions are represented in fence format
Messages are layered so that sequence are indicated
How to choose?
use communication diagrams when there are lot of objects
use sequence diagrams when there are lot of messages
How it differs from SSD
SSD shows interactions with system as black box
Interaction diagrams show interactions of objects within the system