A processing device executes a multi-threaded rule engine having multiple threads. A first thread is associated with user interactions. A second thread is associated with timing events. A third thread is associated with asynchronous execution of the rule engine. A rule engine core is accessible to the second and third threads. The processing device receives user input and generates a first command to perform a first action in view of the user input while executing the first thread. The processing device stores the first command in a queue where the first command is one of multiple commands stored in the queue. The processing device retrieves the multiple commands from the queue and processes the multiple commands using the rule engine core while executing the third thread. The rule engine core is inaccessible to the second thread while in use by the third thread.

Thread coordination in a rule engine using a state machine

Methods, systems, and computing systems are provided for providing a visual representation of a domain model. An example method includes providing a class corresponding to a first stencil. The class is annotated to include a definition, a property, and a rule. A visual representation of the first stencil is provided in a graphical user interface, where the annotated definition and the annotated property modify the visual representation that is displayed. When the visual representation is moved, by a user, in relation to a second stencil, a determination is made, based on the location of the moved first stencil and the second stencil, that the first stencil violates the rule. The visual representation of the moved first stencil is modified to indicate the violation of the rule.

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Thread coordination in a rule engine using a state machine

Framework for modeling with domain model capabilities