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Activity Diagram - Revisited Activity Diagram Also called an “activity graph”, is a variation of a state machine representing actions and subactivities Remember the difference between “activity” and “action” in UML Activity : A sequence of actions that take finite time and can be interrupted

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activity diagram
Activity Diagram
  • Also called an “activity graph”, is a variation of a state machine representing actions and subactivities
    • Remember the difference between “activity” and “action” in UML
    • Activity : A sequence of actions that take finite time and can be interrupted
    • Action: An atomic task that cannot be interrupted (at least from user’s perspective)

C-S 546

activity diagram continued
Activity Diagram (continued)
  • Transitions in an activity diagram do not have labels
    • They indicate the completion of an action or subactivity and show the sequence of actions or subactivities
    • Consequently, these transitions are not based on external events
  • An activity diagram may describe a use case, an operation or a message
    • Purpose: to describe implementation-oriented details

C-S 546

activity diagram basic syntax
Activity Diagram – Basic Syntax

Action 1

Action 2

Action 3

Action 4

[C]

[~C]

split

merge

C-S 546

activity diagram semantics
Activity Diagram - semantics
  • Each action state must have a label; otherwise, no information is conveyed by that action state
  • A transition can be split (see the vertical bar) into multiple transitions that can reach multiple action states
    • These transitions occur concurrently; in the previous diagram, “Action 2” and “Action 3” said to occur concurrently, after “Action 1”

C-S 546

activity diagram semantics continued
Activity Diagram – Semantics (continued)
  • Two or more transitions can be combined together using a merge (the same vertical bar notation)
    • The destination after the merge can be reached ONLY AFTER the source actions are completed
    • In the previous diagram, if “Action 4” is invoked, the entire activity terminates ONLY AFTER “Action 2” and “Action 4” complete

C-S 546

activity diagram semantics continued7
Activity Diagram – Semantics (continued)
  • An outgoing transition from an action state may end up in a condition box (a diamond symbol) and hence will be split into 2 or 3 transitions
    • The conditions must be MUTUALLY EXCLUSIVE
  • Action state labels may represent methods and hence may include parameters

C-S 546

slide8

[No coffee]

[No cola]

Find Beverage

[found cola]

[found coffee]

Put Coffee in Filter

Add Water

Get Cups

Get cola can(s)

Put filter in M/c

Switch on M/c

Wait until brewed

Drink

Pour into cup

Preparing Beverages - ©UML Manual version 1.5

C-S 546

slide9

false

amount > 0

report error

true

false

balance  amount

amount – balance  N

false

report error

true

true

balance = balance - amount

Use case “withdraw” with overdraft protection

‘N’ represents overdraft limit

C-S 546

subactivity
Subactivity

An action state in an activity diagram can be represented by a subactivity as shown below

Subactivity

A subactivity represents a simplification of another activity diagram

It reduces the space for an activity diagram

C-S 546

subactivity semantics
Subactivity - semantics
  • A subactivity is a representation of another activity diagram
  • The incoming arrow to a subactivity matches with the initial state of the activity diagram represented by the subactivity
  • The outgoing arrow from a subactivity matches with the final state of the activity diagram represented by the subactivity

C-S 546

swimlanes
Swimlanes
  • Several activity diagrams can be merged into one diagram
    • particularly to show the interacting actions between these diagrams
  • Each activity diagram is enclosed in a separate box and the boxes are joined together in the swimlane diagram
  • See the example in the next slide

C-S 546

slide13

Customer

Sales

Stockroom

Request service

Take Order

Pay

Fill Order

Deliver order

Collect order

C-S 546

objects as parameters
Objects as parameters
  • Objects passed as parameters between action states can be represented in the activity diagram (and in swimlane diagram) using the same syntax for objects
  • The transition between an object parameters and an action state is represented with a dashed line, instead of a solid line

C-S 546

slide15

Customer

Sales

Stockroom

Request service

: Order [placed]

:Order [entered]

Take Order

Pay

Fill Order

: Order [filled]

:Order [delivered]

Deliver order

Collect order

C-S 546

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