interface StatisticsStorageInterface

interface StatisticsStorageInterface {
    
    /**
     * Count a entity view.
     *
     * @param int $id
     *   The ID of the entity to count.
     *
     * @return bool
     *   TRUE if the entity view has been counted.
     */
    public function recordView($id);
    
    /**
     * Returns the number of times entities have been viewed.
     *
     * @param array $ids
     *   An array of IDs of entities to fetch the views for.
     *
     * @return \Drupal\statistics\StatisticsViewsResult[]
     *   An array of value objects representing the number of times each entity
     *   has been viewed. The array is keyed by entity ID. If an ID does not
     *   exist, it will not be present in the array.
     */
    public function fetchViews($ids);
    
    /**
     * Returns the number of times a single entity has been viewed.
     *
     * @param int $id
     *   The ID of the entity to fetch the views for.
     *
     * @return \Drupal\statistics\StatisticsViewsResult|false
     *   If the entity exists, a value object representing the number of times if
     *   has been viewed. If it does not exist, FALSE is returned.
     */
    public function fetchView($id);
    
    /**
     * Returns the number of times a entity has been viewed.
     *
     * @param string $order
     *   The counter name to order by:
     *   - 'totalcount' The total number of views.
     *   - 'daycount' The number of views today.
     *   - 'timestamp' The unix timestamp of the last view.
     *
     * @param int $limit
     *   The number of entity IDs to return.
     *
     * @return array
     *   An ordered array of entity IDs.
     */
    public function fetchAll($order = 'totalcount', $limit = 5);
    
    /**
     * Delete counts for a specific entity.
     *
     * @param int $id
     *   The ID of the entity which views to delete.
     *
     * @return bool
     *   TRUE if the entity views have been deleted.
     */
    public function deleteViews($id);
    
    /**
     * Reset the day counter for all entities once every day.
     */
    public function resetDayCount();
    
    /**
     * Returns the highest 'totalcount' value.
     *
     * @return int
     *   The highest 'totalcount' value.
     */
    public function maxTotalCount();

}