This action is called each defined unit of time and continues with a defined flow.Īn interruptible activity region represents an area of diagram which can be left by an event. Merge is not used for synchronization of concurrent flows.Ī signal send is an action node invokes an asynchronous event in a target object or a process.Ī signal receipt is an action node that receives an asynchronous message from an object or a process.Īn accept time event node represents a source of periodically generated outputs. Do not confuse this with the Join element. Only one outgoing flow can be used.Ī merge element combines alternative incoming flows into the single one. Conditions in control flows decide which flow will be used. It stops processing until all incoming flows are completed.Ī decision element creates multiple alternative branches of the flow. The first reached activity final node stops the whole activity.Ī fork element splits one incoming flow into multiple outcoming concurrent asynchronous flows.Ī join element combines multiple incoming asynchronous flows into one outcoming flow. An activity diagram can contain multiple nodes of this kind. A flow of objects between actions is described using an object flow relationship.Īn initial node is a starting point of the modeled activity flow.Ī flow final node terminates flows that reach this node.Īn activity final node terminates all flows in an activity. Conditions are used together with decision diamonds when there are multiple possible ways of continuation.Īn object flow connects an action with an object (or with a pin) or an object with an action.Ī pin represents an object. The condition determines whether the path can be used. It can specify a condition, which will be displayed in brackets. An activity can be the invocation of operation, a step in a business process, an entire business process.Īn action represents a single atomic step of flow that cannot be broken nor divided.Ī control flow connects actions and activities (an action with an action, an action with an activity, an activity with an activity). It can also consist of other subactivities. An activity describes behavior using the flow of actions.
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