The following table lists the commonly used combined fragments:Ĭontains a sequence that may or may not occur. You can indicate the condition of the fragment repetition in the threshold. The fragment repeats a certain number of times. If all the thresholds are False and there is no else, no fragments are executed.Ĭontains a sequence that can or does not occur Else The critical indicates that any other critical is not true when the fragment should run. You can set a threshold in each fragment to indicate the conditions that the fragment can run. The choice takes place only one sequence in any situation. The choice used to indicate a mutually exclusive selection between two or more message sequences, equivalent to the classic if. It allows a logical component to be represented directly in a sequence diagram to define special conditions and sub-processes for any part of any lifeline by specifying the conditions or the area of application of the child process. The symbol for the constraint is simple the format is: Ĭombined Fragments used to solve the conditions and methods of interactive execution. There is no need to wait for a response message until the sender continues. The sender waits for a synchronous message response before it continues. When an underscore is used, it means that the lifeline in the sequence diagram represents a specific instance of a class. The arrows are arranged in chronological order from top to bottom in the diagram. Messages are represented by arrows from the lifeline of one object to the lifeline of another object. When an object is present, the character is represented by a dashed line, and the lifeline is a double-lane when the object's procedure is active. The class meta role is represented by a lifeline. The horizontal axis represents the meta roles of individual objects in collaboration. The vertical is the timeline, and the time extends downward along the vertical bar. The Conditional Node is created.Sequence diagrams are primarily used to show the order in which objects interact with each other.Ī sequence diagram represents an interaction as a two-dimensional graph. Expand the Activity diagram palette, click the downward arrow button next to the Conditional Node/Loop Node/Sequence Node icon, and select Conditional Node from the shortcut menu.To enforce the ordering of an evaluation, sequencing constraints may be specified among clauses. Therefore, the result may be nondeterministic if more than one test section can be true concurrently. In general, a test section may be executed in any order, including simultaneously if the underlying execution architecture supports it. If no test section yields a true value, then no body section is executed this may be a semantic error if output values are expected from a Conditional Node. The choice is nondeterministic unless the test sequence of clauses is specified.If more than one test section yields a true value, only one body section will be executed.If one or more test sections yield a true value, one of the corresponding body sections will be executed.When the Conditional Node begins execution, the test sections of the clauses are executed. The Sequence Node is created.Ī Conditional Node is a structured activity node representing an exclusive choice among a number of alternatives.Ī Conditional Node consists of one or more clauses, each consisting of a test section and a body section. Expand the Activity diagram palette, click the downward arrow button next to the Conditional Node/Loop Node/Sequence Node icon, and select Sequence Node from the shortcut menu.When combined with flows, actions must also satisfy their control and data flow inputs before starting execution. When the Sequence Node is enabled, its executable nodes are executed in the specified order. The Loop Node is created.Ī Sequence Node is a structured activity node that executes its actions in order.
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