Execution engine

The execution engine is responsible for running a BPMN model instance. It requires a data provider, several event dispatchers to provide execution relevant information during runtime, and a controller making decisions during execution. Below is an example using a static data provider to obtain a scenario, a ready handler, to provide activity-related information, a deterministic completion handler, to trigger task completion, and a time warp handler, to trigger the advancement of the simulation time, and a greedy controller using a guided evaluator.

#include <bpmnos-model.h>
#include <bpmnos-execution.h>
 
int main() {
  // load model and instances
  BPMNOS::Model::StaticDataProvider dataProvider("diagram.bpmn","scenario.csv");
  auto scenario = dataProvider.createScenario();
 
  // initialize execution engine
  BPMNOS::Execution::Engine engine;
 
  // initialize and connect BPMNOS::Execution::EventDispatcher for BPMNOS::Execution::ReadyEvent
  BPMNOS::Execution::ReadyHandler readyHandler;
  readyHandler.connect(&engine);
 
  // initialize and connect BPMNOS::Execution::EventDispatcher for BPMNOS::Execution::CompletionEvent
  BPMNOS::Execution::DeterministicTaskCompletion completionHandler;
  completionHandler.connect(&engine);
 
  // initialize and connect BPMNOS::Execution::EventDispatcher for BPMNOS::Execution::ClockTickEvent
  BPMNOS::Execution::TimeWarp timeHandler;
  timeHandler.connect(&engine);
 
  // initialize and connect BPMNOS::Execution::Controller for BPMNOS::Execution::Decision
  BPMNOS::Execution::GuidedEvaluator evaluator;
  BPMNOS::Execution::GreedyController controller(&evaluator);
  controller.connect(&engine);
 
  // run engine on scenario
  engine.run(scenario.get());
}