protected function init() {

		// For the cron.
		add_action( $this->schedule_hook, array( $this, 'dispatch_calc' ), 10, 1 );

		// For LifterLMS actions which trigger recalculation.
		$this->actions = array(
			'llms_course_calculate_data'    => array(
				'arguments' => 1,
				'callback'  => 'schedule_calculation',
				'priority'  => 10,
			),
			'llms_user_enrolled_in_course'  => array(
				'arguments' => 2,
				'callback'  => 'schedule_from_course',
				'priority'  => 10,
			),
			'llms_user_removed_from_course' => array(
				'arguments' => 2,
				'callback'  => 'schedule_from_course',
				'priority'  => 10,
			),
			'lifterlms_lesson_completed'    => array(
				'arguments' => 2,
				'callback'  => 'schedule_from_lesson',
				'priority'  => 10,
			),
			'lifterlms_quiz_completed'      => array(
				'arguments' => 3,
				'callback'  => 'schedule_from_quiz',
				'priority'  => 10,
			),
		);

		/**
		 * Throttles course data processing based on the number of a students in a course.
		 *
		 * If the number of students in a course is greater than or equal to this number, the background
		 * process will be throttled to run only once every N hours where N is equal to the number of hours
		 * defined by the `llms_data_processor_course_data_throttle_frequency` filter.
		 *
		 * @since 3.15.0
		 * @since 4.12.0 Reduced default value of `$number_students` from 2500 to 500.
		 *
		 * @see llms_data_processor_course_data_throttle_frequency
		 *
		 * @param int                        $number_students The number of students. Default is `500`.
		 * @param LLMS_Processor_Course_Data $processor       Instance of the data processor class.
		 */
		$this->throttle_max_students = apply_filters( 'llms_data_processor_course_data_throttle_count', 500, $this );

		/**
		 * Frequency to run the processor for a given course when processing is throttled
		 *
		 * @since 3.15.0
		 *
		 * @see llms_data_processor_course_data_throttle_count
		 *
		 * @param int                        $frequency Frequency of the calculation process in seconds. Default `HOUR_IN_SECONDS * 4`.
		 * @param LLMS_Processor_Course_Data $processor Instance of the data processor class.
		 */
		$this->throttle_frequency = apply_filters( 'llms_data_processor_course_data_throttle_frequency', HOUR_IN_SECONDS * 4, $this );

	}