A splitting node braches a control flow into multiple paths while a synchronization reunites the control flows. What is an Activity diagram A UML activity diagram helps to visualize a certain use case at a more detailed level. in cases in which the order of the editing steps is irrelevant, the UML offers the notation elements called splitting and synchronization. Subsequent actions are only carried out if only one alternative path has been carried out.įor non-subsequent workflows, i.e. Alternative workflows are generally attached to conditions.Ī synchronization is a reunion of branches. An activity diagram can contain any number of final nodes and it’s possible for it to be absent in ongoing processes.ĭecision nodes depict alternative workflows. This point is depicted by the final node. After all actions have been completed then the process flow of the activity ends. If an initial node is not present then all nodes that have no incoming edges will be interpreted as starting points.Īn activity final node ends an activity. If there is more than one initial node then some of the affected parallel branches start the process together. or flow of control in a system similar to a flowchart or a data flow diagram. In UML, an activity diagram is used to display the sequence of activities. Activity object nodes include parameter, pin, central buffer, expansion nodes. Object nodes include pin, central buffer, parameter, expansion nodes. Object Nodes An object node is an abstract activity node that is used to define object flows in an activity. Activators can be external entities (actors, source, or destination outside of the system boundary), Data stores (repository for data), and processes (. A special rule is that if incoming token contains some particular object which is already stored in the data store, then the new token will replace any tokens in the object node containing that object. All incoming tokens are stored by the data store. The initial node is the beginning of the process. An activity diagram is part of the Unified Modeling Language structure. UML activity diagram object nodes - object, pin, parameter, central buffer, data store. A data store is a central buffer node for non-transient information. ![]() Let’s go into more detail:Īn initial node depicts the beginning of an activity. ![]() These tokens indicate the status of what is happening. So-called tokens migrate across these connecting lines. Edges are connecting lines between individual nodes. Nodes are points in activity diagrams at which an activity takes places.
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