Activity Diagram Object Flow
They can also describe the steps in a use case diagram.
Activity diagram object flow. Activity diagram is basically a flowchart to represent the flow from one activity to another activity. In activity diagrams there are several ways to define the flow of data between objects. This explicit portrayal of the data object order connected to the activities by two object flows can be refined by using this format. See uml superstructure specification v2 1 1 figure 12 110 p 391.
An activity diagram is particularly good at expressing the flow of objects matter energy or data through a behavior with a focus on how the objects can be accessed and modified in the execution of that behavior during system operation. Activities modeled can be sequential and concurrent. Here is a detailed article on uml activity diagrams. Activity diagrams are often used in business process modeling.
Activity diagram is similar to a business work flow diagram or simply a flowchart with much richer semantics. Activity diagram is uml behavior diagram which shows flow of control or object flow with emphasis on the sequence and conditions of the flow. It describes the system activities or the person who does the activity and the sequential flow of these activities. An object flow is a path along which objects or data can pass.
An activity diagram visually presents a series of actions or flow of control in a system similar to a flowchart or a data flow diagram. The actions coordinated by activity models can be initiated because other actions finish executing because objects and data become available or because some events external to the flow occur. This flow can be sequential branched or concurrent. Here action pins are used to reflect the order.
The activity can be described as an operation of the system. Object flow is a path along which objects or data can pass. An object is shown as a rectangle. The control flow is drawn from one operation to another.
Common usages of an activity diagram in sysml includes. An object flow is shown as a connector with an arrowhead denoting the direction the object is being passed.