A simple example of an activity diagram
A subsidiary activity diagram
Invoke the subsidiary activity
If you want to show who does what, you can divide an activity diagram
into partitions, which show which actions one class or organization
unit carries out.
A signal indicates that the activity receives an event from an
outside process.
As well as accepting signals, we can send them. This is useful when
we
have to send a message and then wait for a reply before we can continue.
Actions can have parameters, just as methods do. You don't need to
show
information about parameters on the activity diagram, but if you wish,
you can show them with pins. If you're decomposing an action, pins
correspond to the parameter boxes on the decomposed diagram.
When
you're drawing an activity diagram strictly, you have to ensure that
the output parameters of an outbound action match the input parameters
of another. If they don't match, you can indicate a transformation to
get from one to another. The transformation must be an expression
that's free of side effects: essentially, a query on the output pin
quary that supplies an object of the right type for the input pin.
An expansion region marks an activity diagram area where actions
occur once for each item in a collection.
A flow final indicates the end of one particular flow, without
terminating the whole activity
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