Introduction to Activity Diagrams
An activity is an ongoing atomic execution within a state machine. Activities always result in some action. Activity diagrams look at the operations that are passed among objects.
Activity diagrams model the dynamic aspects of system. They are essentially flowcharts which shown flow of control from activity to activity. Some aspects of it are:
Contents of Activity Diagrams
There are some contents of activity diagrams given:
1. Activity state and action states,
2. Transitions and
3. Objects
These contents are now discussed one by one.
1. Activity State and Action States: The difference between these two states are:
Action states cant be decomposed whereas activity states can be decomposed further as the activities of the states are depicted by other activity diagrams.
Action states are atomic means that events may occur and they don't affect the work of the action state. Activity diagrams are not atomic i. e. They may be interrupted.
An action state is represented by using a lozenge shape as shown in fig 8.32,
Inside the steps we can write any expression.
On the other hand activity states may have some additional such as entry and exit actions.
2. Transition: The flow of control passes immediately to the next action or activity state whenever the action or activity of a state completes. This flow is depicted by using transitions to shown path from one action / activity state to the next action/ activity state.
Transition is represented by a simple directed line, shown in fig 8.33,
3. Objects: There are many objects and we have already discussed them in the objects diagrams. One more concept to be discussed is branching.
Branching
A branch can be included to model the flow of control. The branch specifies alternate paths taken based on some Boolean expressions. So ,
Branches are depicted as diamonds as shown in fig 8.34,
A branch may have one incoming transition and two or more outgoing ones.
Iteration is also possible
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