In the UML, an object-flow transition is shown as a dashed arrow between an action state and an object. In the UML, a control-flow transition is shown as a solid line from a source action state to a target action state. If there is a constraint to be adhered to while making the transition it is mentioned on the arrow. We use a line with an arrow head to depict a Control Flow. An activity state can have multiple incoming and outgoing action flows. They are used to show the transition from one activity state to another. Control FlowĪction flows or Control flows are also referred to as paths and edges. There are various types of flow transitions, including control-flow and object-flow transitions. Given a collection of action states, how are those action states related to one another? Flow transitions address this issue, a flow transition shows how action states are ordered or sequenced. that is not further decomposed within the activity. Action and Activity StateĪn activity, also known as an activity state, on a UML Activity diagram typically represents the invocation of an operation, a step in a business process, or an entire business process.Īction is a named element which represents a single atomic step within activity i.e. Note: This was not an issue in UML 1.5 because of the run-to-completion semantics, but with the unrestricted parallelism of UML 2.0, you might not want all flows stopped and all tokens destroyed. The Flow Final simply terminates the flow to which it is attached. It is needed because in UML 2.0, when control reaches any instance of Activity Final node, the entire activity (including all flows) is terminated. UML 2.0 has an additional control node type called Flow Final that is used as an alternative to the Activity Final node to terminate a flow. An activity diagram may have only one initial action state, but may have any number of final action states. In the UML, a final action state is shown using a circle surrounding a small solid filled circle (a bull's eye). The Initial State from the UML Activity Diagram marks the entry point and the initial Activity State.We use a black filled circle to depict the initial state of a system. A process can have only one initial state unless we are depicting nested activities.The starting state before an activity takes place is depicted using the initial state.Initial, Final and Flow Final Node Initial Node (Start State) View and play PowerPoint presentations online.
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