public static function init()
{
Driver::$DRIVER_ATTRIBUTE_KEYS = array(RegionBasedEntity::LATITUDE_KEY, RegionBasedEntity::LONGITUDE_KEY, RegionBasedEntity::REGION_KEY);
}
/**
* Looks up driver details in cache.
*
* Performance: O(1) time complexity (constant time)
*
* @param $driverId int id of driver to look up details for
* @return bool|Driver returns false if driver doesn't exist in the cache,
* otherwise it returns a Driver model instance containing driver details
*/
public function lookupDriver($driverId)
{
if (!is_int($driverId)) {
throw new InvalidArgumentException("lookupDriver expects driver id to be an integer. Input was: {$driverId}");
}
$driverId = intval($driverId);
if (!$this->client->exists(self::driverPath($driverId))) {
return false;
}
//O(1) time complexity
$values = $this->client->hmget(self::driverPath($driverId), Driver::$DRIVER_ATTRIBUTE_KEYS);
return Driver::fromValues($driverId, $values);
}