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Partitions can be nested to form a hierarchy of partitions.Īctions and objects in an order processing activity can be divided into 3 groups:.If an action or object may located on the border of multiple partitions, is considered to be in multiple groups.Any actions and objects that are located within the two lines are considered to be in the group.
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Join action performed before the Close Order action to wait for both Ship Order action and Send Invoice action to finish can be drawn as in the diagram as shown below: It is drawn as a short solid line with multiple incoming control flows on one side and one outgoing control flows on the other side. It represents a join action that waits for multiple concurrent execution flows to finish. The fork action performed after the Receive Order action to start Ship Order action and Send Invoice action concurrently can be drawn in the diagram as shown below: It is drawn as a short solid line with one incoming control flow on one side and multiple outgoing control flows on the other side. It represents a fork action that splits a single execution flow into multiple concurrent execution flows. The merge point where Ship Order and Hold Order meet can be drawn in the diagram as a Merge Notation as shown below: It is drawn as a small diamond shape with multiple incoming control flows and on outgoing control flow. It represents a merge point where multiple alternate execution paths will meet and continue. The decision action performed after the Receive Order action to check the stock can be drawn in the diagram as shown below: It represents a decision action that evaluates certain conditions and decides which action path to continue the execution.Ī Decision Notation is drawn as a small diamond shape with one incoming control flow and multiple outgoing control flows.Įach outgoing control flow should be labeled with the condition that leads to this flow.
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It also allows them to identify the constraints and conditions that trigger specific events. Developers use activity diagrams to understand the high-level flow of a program.