3.activity diagram

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Activity Diagrams

March 12, 2014

Activity Diagrams
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Activity Diagrams

UML diagrams that can be used to describe the dynamicbehavior of a system.

Activity Diagrams
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Activity Diagrams


They specify both sequential and concurrent flows of activities.

Activity Diagrams
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Activity Diagrams


They specify both sequential and concurrent flows of activities. They are used to show the workflow of the system.

Activity Diagrams
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Activity Diagrams



Flow of control from activity to activity in the system

Activity Diagrams
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Activity Diagrams



Flow of control from activity to activity in the system What activities can be done in parallel

Activity Diagrams
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Activity Diagrams



Flow of control from activity to activity in the system What activities can be done in parallel Alternate paths to the flow

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Components

Activity diagrams are constructed using the following shapes,connected by arrows:

Activity Diagrams


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Components


1. rounded rectangles represent actions

Activity Diagrams


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Components



2. diamonds represent decisions

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Components




3. barsrepresent the start or end of concurrent activities

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Components





4. a black circlerepresents the initial state

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Components





4. a black circlerepresents the initial state

5. an encircled black circlerepresents the final state

Activity Diagrams


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Example

Consider the flow of activities of an order management system.

Activity Diagrams


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Example

Consider the flow of activities of an order management system. Whena customer sends an order request, the order request system confirmsthe receipt of the order.

Activity Diagrams
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Example

Consider the flow of activities of an order management system. Whena customer sends an order request, the order request system confirmsthe receipt of the order.After receiving the order request, conditionchecks are performed to check if it is a normal or a special order.

Activity Diagrams
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Example

Consider the flow of activities of an order management system. Whena customer sends an order request, the order request system confirmsthe receipt of the order.After receiving the order request, conditionchecks are performed to check if it is a normal or a special order.After the type of order is identified, the order is dispatched.

Activity Diagrams
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Example

Consider the flow of activities of an order management system. Whena customer sends an order request, the order request system confirmsthe receipt of the order.After receiving the order request, conditionchecks are performed to check if it is a normal or a special order.After the type of order is identified, the order is dispatched.The problem describes 4 main activities:

1. Send order by customer

Activity Diagrams
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Example



2. Receipt of the order

Activity Diagrams
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Example




3. Confirm the order

Activity Diagrams
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Example




3. Confirm the order

4. Dispatch order

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Example continued...

Activity Diagrams
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Activity vs Action

ActivityAn activity consists of a block of statements that take some time toexecute.

Activity Diagrams
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Activity vs Action


Action

An action consists of a single statement and takes an insignificantamount of time to execute.

Actions and activities can be grouped according to actor, object,or system that performs them.

Activity Diagrams
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Activity vs Action


Action



Vertical lines separate the obtained groups.

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Activity vs Action


Action



Vertical lines separate the obtained groups.

A swimlane includes all grouped action and activities betweentwo vertical lines.

Activity Diagrams


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Example

Consider the flow of activities within a company that receives ordersthrough the internet.

Activity Diagrams
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Example

Consider the flow of activities within a company that receives ordersthrough the internet.Once the order is received by the CustomerService department, the customers credit is checked.

Activity Diagrams
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Example

Consider the flow of activities within a company that receives ordersthrough the internet.Once the order is received by the CustomerService department, the customers credit is checked.If the customerhas a bad credit rating, the order is rejected and closed.

Activity Diagrams
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Example

Consider the flow of activities within a company that receives ordersthrough the internet.Once the order is received by the CustomerService department, the customers credit is checked.If the customerhas a bad credit rating, the order is rejected and closed. Otherwise,an invoice is prepared and sent to the Finance department for follow

up and, at the same time, the order is sent to the Order Fulfillmentdepartment.

Activity Diagrams
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Example


up and, at the same time, the order is sent to the Order Fulfillmentdepartment. The Finance department processes the payment oncereceived and informs the Customer Service department.

Activity Diagrams
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Example


up and, at the same time, the order is sent to the Order Fulfillmentdepartment. The Finance department processes the payment oncereceived and informs the Customer Service department.Also, theOrder Fulfillment department checks to see if the ordered items areavailable.

Activity Diagrams
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Example


up and, at the same time, the order is sent to the Order Fulfillmentdepartment. The Finance department processes the payment oncereceived and informs the Customer Service department.Also, theOrder Fulfillment department checks to see if the ordered items areavailable. If available, the order is delivered to the customer,

otherwise, it is back ordered.

Activity Diagrams
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Example


up and, at the same time, the order is sent to the Order Fulfillmentdepartment. The Finance department processes the payment oncereceived and informs the Customer Service department.Also, theOrder Fulfillment department checks to see if the ordered items areavailable. If available, the order is delivered to the customer,

otherwise, it is back ordered.In either case, the Customer Servicedepartment is informed to close the order.

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Example continued...

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Exercise (SW or HW)

Consider the process of ordering pizza over the phone. Draw anactivity diagram representing each step of the process, from themoment you pick up the phone to the point where you start eating

your pizza. Include activities that others need to perform (i.e. useswimlanes). Consider also at least three exceptions (e.g. deliveryperson wrote down wrong address, delivery person brought the wrongpizza, pizza shop out of pepperoni,...)

Activity Diagrams
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3.activity diagram

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