number.
	 * @param int    $range_end Ending batch number.
	 * @param string $single_batch_action Action to schedule for a single batch.
	 * @param array  $action_args Action arguments.
	 * @return void
	 */
	public static function queue_batches( $range_start, $range_end, $single_batch_action, $action_args = array() ) {
		$batch_size       = static::get_batch_size( 'queue_batches' );
		$range_size       = 1 + ( $range_end - $range_start );
		$action_timestamp = time() + 5;

		if ( $range_size > $batch_size ) {
			// If the current batch range is larger than a single batch,
			// split the range into $queue_batch_size chunks.
			$chunk_size = (int) ceil( $range_size / $batch_size );

			for ( $i = 0; $i < $batch_size; $i++ ) {
				$batch_start = (int) ( $range_start + ( $i * $chunk_size ) );
				$batch_end   = (int) min( $range_end, $range_start + ( $chunk_size * ( $i + 1 ) ) - 1 );

				if ( $batch_start > $range_end ) {
					return;
				}

				self::schedule_action(
					'queue_batches',
					array( $batch_start, $batch_end, $single_batch_action, $action_args )
				);
			}
		} else {
			// Otherwise, queue the single batches.
			for ( $i = $range_start; $i <= $range_end; $i++ ) {
				$batch_action_args = array_merge( array( $i ), $action_args );
				self::schedule_action( $single_batch_action, $batch_action_args );
			}
		}
	}

	/**
	 * Clears all queued actions.
	 */
	public static function clear_queued_actions() {
		if ( version_compare( \ActionScheduler_Versions::instance()->latest_version(), '3.0', '>=' ) ) {
			\ActionScheduler::store()->cancel_actions_by_group( static::$group );
		} else {
			$actions = static::get_actions();
			foreach ( $actions as $action ) {
				self::queue()->cancel_all( $action, null, static::$group );
			}
		}
	}
}