interface MigrateLookupInterface

interface MigrateLookupInterface {
    
    /**
     * Retrieves destination ids from a migration lookup.
     *
     * @param string|string[] $migration_ids
     *   An array of migration plugin IDs to look up, or a single ID as a string.
     * @param array $source_id_values
     *   An array of source id values.
     *
     * @return array
     *   An array of arrays of destination ids, or an empty array if none were
     *   found.
     *
     * @throws \Drupal\Component\Plugin\Exception\PluginException
     *   Thrown by the migration plugin manager on error, or if the migration(s)
     *   cannot be found.
     * @throws \Drupal\migrate\MigrateException
     *   Thrown when $source_id_values contains unknown keys, or is the wrong
     *   length.
     */
    public function lookup($migration_ids, array $source_id_values);

}