![]() Before the token can start this action, it must comply with the input pin specifications. If the result and token correspond to the specifications defined in the pin, this output pin sends the object token via an object flow to the next action. There are two types of tokens in the UML activity diagram: the first is the object token, which transmits information to the action node, starts an action there and (if specified) saves the result as a value. In the activity diagram, these “persons” are referred to as tokens. In between, there are occasional barriers, so-called pins, which they only let things through under certain conditions e.g. You move from a starting point to an end point, crossing control or object flows to move from one action to the next. Although these two people play an important role in the activity diagram, they don’t have their own notation. The people start their activity at these points and go from one action to the next. This means that the activity has two starting points. If two people are in charge of preparing the omelet, this enables the actions to be carried out simultaneously i.e. Parallel processes can also be illustrated. One action would be "breaking eggs," followed by the action "whisking eggs while seasoning." The first action requires the second. For example, the activity "preparing a cheese omelet" can be broken down into many small sub-activities: the actions. These can be processes within a computer system, use case processes, or business processes. Activity diagrams are similar in use and notation to flowcharts (especially program flowcharts), but are tailored to object-oriented programming.īasically, it can be said that the activity diagram models the flow of activities. In addition to the activity diagram, the “use case diagram” and the “state machine diagram” belong to this group. the existing objects and their hierarchies as well as connections to each other at a certain point, behavior diagrams describe the chronological flow of data streams. While a structure diagram records the state of a system, i.e. UML activity diagrams belong to the group of behavior diagrams in unified modeling language.
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