double next_occuring_event(double now) override;
void updateActionsState(double now, double delta) override;
Action *executeParallelTask(int host_nb, sg_host_t *host_list,
double next_occuring_event(double now) override;
void updateActionsState(double now, double delta) override;
Action *executeParallelTask(int host_nb, sg_host_t *host_list,