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Two object tokens trip that refer to the identical
object arrive at the join node. Only one object token is forwarded according to
the synchronization rule. Finally the trip is confi rmed. Note that, in this example,
two different fl ows access the same resource concurrently, which can potentially
lead to confl icts. However, this is not considered in the activity.
3.6.8 Interruptible Activity Region
3.6 The Activity Diagram
FIGURE 3-53
Example for interruptible activity regions.
act Interruptible activity region (section)
Select
soft drink
Pay
soft drink
Time interruption
User
termination
Defi nition
An interruptible activity region characterizes a region within an activity,
which can be terminated by a token flow at special interruption edges.
Many system flows can be terminated. Either a user pushes a stop button, or a
time interruption occurs when a defined time window is exceeded, or another
condition occurs. An interruptible activity region supports exactly this flow
behavior.
Interruptible actions are denoted as dashed rectangles with rounded corners.


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