To enforce ordering of an evaluation, sequencing constraints may be specified among clauses. If condition2 is true then block2 will be executed and then we will jump again to block5. For example in the diagram below, once 'sleep till hold period' is expired I want to take control back to the 'isiteminventoryonholdstate(itemid)' statement. If condition1 is false then condition2 will be checked. How can I show goto statements in Sequence Diagrams. If condition1 is true then block1 will be executed and then we will jump to block5. The result may therefore be nondeterministic if more than one test section can be true concurrently. Condition1 of the if statement will be checked. 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 the conditional node. You can also use combined fragments for more complicated conditional logic. Here's a picture with an example: Notice the ' pastDueBalance 0' condition. A guard is a boolean expression that you can write over a transition. The choice is non-deterministic, unless the test sequence of clauses is specified. In UML models, an interaction is a behavior that represents communication between one or more participants. As in many types of UML diagrams, you can use guards to denote a condition.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. Conditional NodeĪ 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. 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 order specified. It is similar to alt with only one trace. Sequence NodeĪ sequence node is a structured activity node that executes its actions in order. Optional: If the supplied condition is true, only then the fragments will execute. The results of the final execution of the test or body are available after execution of the loop is completed. ![]() The setup section is executed once on entry to the loop, and the test and body sections are executed repeatedly until the test produces a false value. The test section may precede or follow the body section. A loop node is a constructed activity node representing a loop with setup, test, and body sections.Įach section is a well-nested subregion of an activity whose nodes follow any predecessors of the loop and precede any successors of the loop.
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