ication $b ) {

		$a_type = $a->get_type();
		$b_type = $b->get_type();

		if ( $a_type === $b_type ) {
			return WPSEO_Utils::calc( $b->get_priority(), 'compare', $a->get_priority() );
		}

		if ( 'error' === $a_type ) {
			return -1;
		}

		if ( 'error' === $b_type ) {
			return 1;
		}

		return 0;
	}

	/**
	 * Clear local stored notifications.
	 */
	private function clear_notifications() {

		$this->notifications           = array();
		$this->notifications_retrieved = false;
	}

	/**
	 * Filter out non-persistent notifications.
	 *
	 * @param Yoast_Notification $notification Notification to test for persistent.
	 *
	 * @since 3.2
	 *
	 * @return bool
	 */
	private function filter_persistent_notifications( Yoast_Notification $notification ) {

		return $notification->is_persistent();
	}

	/**
	 * Filter out dismissed notifications.
	 *
	 * @param Yoast_Notification $notification Notification to check.
	 *
	 * @return bool
	 */
	private function filter_dismissed_notifications( Yoast_Notification $notification ) {

		return ! $this->maybe_dismiss_notification( $notification );
	}

	/**
	 * Convert Notification to array representation.
	 *
	 * @param Yoast_Notification $notification Notification to convert.
	 *
	 * @since 3.2
	 *
	 * @return array
	 */
	private function notification_to_array( Yoast_Notification $notification ) {

		$notification_data = $notification->to_array();

		if ( isset( $notification_data['nonce'] ) ) {
			unset( $notification_data['nonce'] );
		}

		return $notification_data;
	}

	/**
	 * Convert stored array to Notification.
	 *
	 * @param array $notification_data Array to convert to Notification.
	 *
	 * @return Yoast_Notification
	 */
	private function array_to_notification( $notification_data ) {

		if ( isset( $notification_data['options']['nonce'] ) ) {
			unset( $notification_data['options']['nonce'] );
		}

		return new Yoast_Notification(
			$notification_data['message'],
			$notification_data['options']
		);
	}

	/**
	 * Filter notifications that should not be displayed for the current user.
	 *
	 * @param Yoast_Notification $notification Notification to test.
	 *
	 * @return bool
	 */
	private function filter_notification_current_user( Yoast_Notification $notification ) {
		return $notification->display_for_current_user();
	}

	/**
	 * Checks if given notification is persistent.
	 *
	 * @param Yoast_Notification $notification The notification to check.
	 *
	 * @return bool True when notification is not persistent.
	 */
	private function is_notification_persistent( Yoast_Notification $notification ) {
		return ! $notification->is_persistent();
	}

	/**
	 * Queues a notification transaction for later execution if notifications are not yet set up.
	 *
	 * @param callable $callback Callback that performs the transaction.
	 * @param array    $args     Arguments to pass to the callback.
	 *
	 * @return bool True if transaction was queued, false if it can be performed immediately.
	 */
	private function queue_transaction( $callback, $args ) {
		if ( $this->notifications_retrieved ) {
			return false;
		}

		$this->add_transaction_to_queue( $callback, $args );

		return true;
	}

	/**
	 * Adds a notification transaction to the queue for later execution.
	 *
	 * @param callable $callback Callback that performs the transaction.
	 * @param array    $args     Arguments to pass to the callback.
	 */
	private function add_transaction_to_queue( $callback, $args ) {
		$this->queued_transactions[] = array( $callback, $args );
	}

	/**
	 * Removes all notifications from storage.
	 *
	 * @return bool True when notifications got removed.
	 */
	protected function remove_storage() {
		if ( ! $this->has_stored_notifications() ) {
			return false;
		}

		delete_user_option( get_current_user_id(), self::STORAGE_KEY );
		return true;
	}

	/**
	 * Checks if there are stored notifications.
	 *
	 * @return bool True when there are stored notifications.
	 */
	protected function has_stored_notifications() {
		$stored_notifications = $this->get_stored_notifications();

		return ! empty( $stored_notifications );
	}

	/**
	 * Retrieves the stored notifications.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return array|false Array with notifications or false when not set.
	 */
	protected function get_stored_notifications() {
		return get_user_option( self::STORAGE_KEY, get_current_user_id() );
	}
}