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// Note: Service providers schedule actions.
// Only puzzle runners call step().
// interface for ProbabilisticScheduler (#1031949)
sinterface IProbabilisticScheduler extends Steppable {
  // schedule an action at an absolute probability
  void at(double probability, Runnable action);
  
  // schedule an action at a probability relative to
  // currentProbability()
  default void atRelative aka schedule(double probability, Runnable action) {
    at(currentProbability()*probability, action);
  }
  
  double currentProbability(); // for thread, only while running a step
  long stepCount();
  
  double lastExecutedProbability();
  
  default void run(IProbabilistic x) {
    if (x == null) ret;
    x.setScheduler(this);
    x.run();
  }
}