In the Unified Modeling Language, an action is a named element that is the fundamental unit of executable functionality. The execution of an action represents some transformation or processing in the modeled system. An action execution represents the run-time behavior of executing an action within a specific behavior execution. All action executions will be executions of specific kinds of actions because action is an abstract class. When the action executes, and what its actual inputs are, is determined by the concrete action and the behaviors in which it is used.
The Unified Modeling Language (UML) is a general-purpose, developmental, modeling language in the field of software engineering, that is intended to provide a standard way to visualize the design of a system.
In computer science, run time, runtime or execution time is the time during which a program is running (executing), in contrast to other program lifecycle phases such as compile time, link time and load time.
An action is the specification of an executablestatement and is the fundamental unit of processing or behavior in an activity node that represents some transformation in the modeled system.
In computing, executable code or an executable file or executable program, sometimes simply referred to as an executable, causes a computer "to perform indicated tasks according to encoded instructions," as opposed to a data file that must be parsed by a program to be meaningful.
In mathematics, and more specifically in graph theory, a vertex or node is the fundamental unit of which graphs are formed: an undirected graph consists of a set of vertices and a set of edges, while a directed graph consists of a set of vertices and a set of arcs. In a diagram of a graph, a vertex is usually represented by a circle with a label, and an edge is represented by a line or arrow extending from one vertex to another.
An action forms an abstraction of a computational procedure which is an atomic execution and therefore completes without interruption. An action is considered to take zero time and cannot be interrupted. In contrast, an activity is a more complex collection of behavior that may run for a long duration. An activity may be interrupted by events, in which case it does not run to completion.
An action is a result of a system state change and is realized by sending a message to an object or modifying a link or a value of an attribute.
In information technology and computer science, a program is described as stateful if it is designed to remember preceding events or user interactions; the remembered information is called the state of the system.
In computer science, an object can be a variable, a data structure, a function, or a method, and as such, is a value in memory referenced by an identifier.
In computer science, a value is the representation of some entity that can be manipulated by a program. The members of a type are the values of that type.
An action may receive inputs in the form of control flows and object flows (the latter via input pins) and passes the results of its processing or transformations to one or more outgoing control flows or object flows (the latter via output pins) and onto downstream nodes.
Execution of the action cannot begin until all its prerequisites are satisfied. All incoming control flows have control tokens and all input pins have object tokens.
An action refers to the suite of rules and policies associated with a state machinestate, and is represented as an object method.
Actions are contained within and are provided context by activities.
An action behavior accompanies a transition event.
Action types
On Entry: occurs when an activity is entered.
Do: occurs while an activity is occurring. These are the steps within the activity.
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