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<?php |
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namespace Vectorface\Cache\Common; |
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use DateInterval; |
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use DateTime; |
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use Exception; |
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use Traversable; |
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use Vectorface\Cache\Exception\CacheException; |
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use Vectorface\Cache\Exception\InvalidArgumentException as CacheArgumentException; |
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/** |
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* Utility methods common to many PSR-16 cache implementations |
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*/ |
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trait PSR16Util |
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{ |
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/** |
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* The DateTime implementation to use |
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* |
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* @var string |
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*/ |
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private static $dateTimeClass = DateTime::class; |
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/** |
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* Enforce a fairly standard key format |
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* |
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* @param mixed $key |
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* @return int|float|string|bool Returns the key, if valid |
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* @throws CacheArgumentException Thrown if the key is not a legal value |
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*/ |
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protected function key($key) |
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{ |
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if (is_numeric($key) || is_string($key)) { |
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return $key; |
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} |
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throw new CacheArgumentException("key is not a legal value"); |
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} |
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/** |
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* Enforce fairly standard key formats on an iterable of values |
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* @param iterable $values |
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* @return iterable The values array |
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* @throws CacheArgumentException Thrown if any of the keys is not a legal value |
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*/ |
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protected function values($values) { |
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if (!is_array($values) && !($values instanceof Traversable)) { |
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throw new CacheArgumentException("values must be provided as an array or a Traversable"); |
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} |
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$array = []; |
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foreach ($values as $key => $value) { |
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$array[$this->key($key)] = $value; |
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} |
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return $array; |
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} |
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/** |
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* Enforce a fairly standard key format on an array or Traversable of keys |
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* |
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* @param iterable $keys |
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* @return mixed[] Returns the keys, if valid |
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* @throws CacheArgumentException Thrown if any of the keys is not a legal value |
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*/ |
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protected function keys($keys) |
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{ |
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if (!is_array($keys) && !($keys instanceof Traversable)) { |
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throw new CacheArgumentException("keys must be provided as an array or a Traversable"); |
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} |
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$array = []; |
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foreach ($keys as $key) { |
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$array[] = $this->key($key); |
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} |
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return $array; |
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} |
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/** |
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* Enforce a valid step value for increment/decrement methods |
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* |
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* @param int $step |
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* @return int |
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* @throws CacheArgumentException Thrown if the step is not a legal value |
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*/ |
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protected function step($step) |
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{ |
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if (!is_integer($step)) { |
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throw new CacheArgumentException("step must be an integer"); |
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} |
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return $step; |
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} |
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/** |
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* Add defaults to an array of values from a cache |
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* |
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* Note: This does NOT check the keys array |
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* |
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* @param array|iterable $keys An array of expected keys |
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* @param array $values An array of values pulled from the cache |
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* @param mixed $default The default value to be populated for missing entries |
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* @return array The values array, with defaults added |
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*/ |
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protected static function defaults($keys, $values, $default) |
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{ |
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foreach ($keys as $key) { |
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if (!isset($values[$key])) { |
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$values[$key] = $default; |
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} |
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} |
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return $values; |
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} |
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/** |
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* Convert a PSR-16 compatible TTL argument to a standard integer TTL as used by most caches |
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* |
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* @param mixed $ttl Takes a valid TTL argument and converts to an integer TTL |
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* @throws CacheArgumentException|CacheException Throws if the argument is not a valid TTL |
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* @return int |
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*/ |
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public static function ttl($ttl) |
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{ |
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if ($ttl instanceof DateInterval) { |
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return static::intervalToTTL($ttl); |
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} elseif (is_numeric($ttl) || $ttl === null) { |
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return $ttl; |
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} |
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throw new CacheArgumentException("TTL must be specified as a number, a DateInterval, or null"); |
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} |
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/** |
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* Convert a DateInterval to a time diff in seconds |
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134
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* |
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* @param DateInterval $interval |
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* @return int The number of seconds from now until $interval |
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* @throws CacheException |
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*/ |
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2 |
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public static function intervalToTTL(DateInterval $interval) |
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{ |
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2 |
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$dateClass = self::$dateTimeClass; |
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try { |
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$now = new $dateClass(); |
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1 |
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$exp = (new $dateClass())->add($interval); |
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1 |
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} catch (Exception $e) { |
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throw new CacheException("Could not get current DateTime"); |
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} |
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1 |
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return $exp->getTimestamp() - $now->getTimestamp(); |
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} |
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} |
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Vectorface /
cache
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