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<?php |
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namespace SubjectivePHP\Psr\SimpleCache; |
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use Psr\SimpleCache\CacheInterface; |
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/** |
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* A PSR-16 implementation which does not save or store any data. |
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*/ |
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final class NullCache implements CacheInterface |
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{ |
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/** |
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* Fetches a value from the cache. |
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* |
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* @param string $key The unique key of this item in the cache. |
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* @param mixed $default Default value to return if the key does not exist. |
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* |
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* @return mixed The value of the item from the cache, or $default in case of cache miss. |
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*/ |
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public function get($key, $default = null)//@codingStandardsIgnoreLine Interface does not define type-hints |
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{ |
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return $default; |
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} |
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/** |
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* Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time. |
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* |
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* @param string $key The key of the item to store. |
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* @param mixed $value The value of the item to store, must be serializable. |
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* @param null|integer|DateInterval $ttl Optional. The TTL value of this item. If no value is sent and |
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* the driver supports TTL then the library may set a default value |
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* for it or let the driver take care of that. |
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* |
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* @return boolean True on success and false on failure. |
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*/ |
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public function set($key, $value, $ttl = null)//@codingStandardsIgnoreLine Interface does not define type-hints |
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{ |
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return true; |
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} |
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/** |
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* Delete an item from the cache by its unique key. |
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* |
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* @param string $key The unique cache key of the item to delete. |
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* |
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* @return boolean True if the item was successfully removed. False if there was an error. |
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*/ |
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public function delete($key)//@codingStandardsIgnoreLine Interface does not define type-hints |
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{ |
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return true; |
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} |
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/** |
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* Wipes clean the entire cache's keys. |
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* |
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* @return boolean True on success and false on failure. |
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*/ |
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public function clear() |
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{ |
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return true; |
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} |
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/** |
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* Obtains multiple cache items by their unique keys. |
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* |
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* @param iterable $keys A list of keys that can obtained in a single operation. |
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* @param mixed $default Default value to return for keys that do not exist. |
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* |
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* @return array A list of key => value pairs. Keys that do not exist or are stale will have $default as value. |
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*/ |
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public function getMultiple($keys, $default = null)//@codingStandardsIgnoreLine Interface does not define type-hints |
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{ |
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$items = []; |
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foreach ($keys as $key) { |
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$items[$key] = $default; |
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} |
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return $items; |
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} |
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/** |
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* Persists a set of key => value pairs in the cache, with an optional TTL. |
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* |
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* @param iterable $values A list of key => value pairs for a multiple-set operation. |
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* @param null|integer|DateInterval $ttl Optional. The TTL value of this item. If no value is sent and |
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* the driver supports TTL then the library may set a default value |
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* for it or let the driver take care of that. |
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* |
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* @return boolean True on success and false on failure. |
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*/ |
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public function setMultiple($values, $ttl = null)//@codingStandardsIgnoreLine Interface does not define type-hints |
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{ |
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return true; |
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} |
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/** |
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* Deletes multiple cache items in a single operation. |
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* |
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* @param iterable $keys A list of string-based keys to be deleted. |
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* |
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* @return boolean True if the items were successfully removed. False if there was an error. |
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*/ |
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public function deleteMultiple($keys)//@codingStandardsIgnoreLine Interface does not define type-hints |
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{ |
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return true; |
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} |
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/** |
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* Determines whether an item is present in the cache. |
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* |
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* NOTE: It is recommended that has() is only to be used for cache warming type purposes |
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* and not to be used within your live applications operations for get/set, as this method |
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* is subject to a race condition where your has() will return true and immediately after, |
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* another script can remove it making the state of your app out of date. |
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* |
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* @param string $key The cache item key. |
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* |
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* @return boolean |
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*/ |
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public function has($key)//@codingStandardsIgnoreLine Interface does not define type-hints |
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{ |
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return false; |
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} |
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} |
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