Through Java APIs, a simulation execution starts when the specific element is executed. You can Starting execution, Stopping execution, and Creating and registering a new SimulationExecutionListener using Java APIs. Regarding the core component of the entire execution mechanism, the Engine defines how to execute a set of Element types. fUML Helper is also available as a Class that provides Helper methods related to the fUML structures. The Parametric engine also provides Java APIs for a parametric execution with a runtime object of a Classifier.
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For more information about Cameo Simulation Toolkit JavaDoc files, visit http://jdocs.nomagic.com/190/CST.