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<?php |
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namespace Ezcache\Cache; |
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/** |
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* @codeCoverageIgnore |
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* @author: William Johnson dos Santos Okano <[email protected]> |
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*/ |
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class MemCached implements CacheInterface |
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{ |
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/** @var string */ |
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private $namespace; |
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/** @var int */ |
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private $ttl; |
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/** @var \Memcached */ |
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private $memcachedInstance; |
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/** |
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* MemCached constructor. |
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* |
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* @param \Memcached $memcached the memcached instance |
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* @param int $ttl the cache lifetime in seconds (0 = Forever) |
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* @param string $namespace the cache namespace |
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*/ |
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public function __construct(\Memcached $memcached, $ttl = 0, string $namespace = null) |
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{ |
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$this->ttl = $ttl; |
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$this->memcachedInstance = $memcached; |
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if ($namespace !== null) { |
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$this->setNamespace($namespace); |
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} |
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} |
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/** |
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* Set the cache namespace |
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* |
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* @param string $namespace the cache namespace |
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* |
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* @return bool true on success or false on failure |
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*/ |
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public function setNamespace(string $namespace) : bool |
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{ |
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$this->namespace = $namespace; |
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return true; |
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} |
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/** |
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* Set a value to a key on cache. |
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* |
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* Set a value to a key on cache. |
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* |
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* @param string $key the key to be set. |
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* @param mixed $value the correspondent value of that cache key. |
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* @param int|null $ttl the cache life time in seconds (If no value passed will use the default value). |
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* |
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* @return bool true on success or false on failure. |
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*/ |
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public function set(string $key, $value, int $ttl = null) : bool |
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{ |
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$ttl = $ttl ?? $this->ttl; |
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$key = $this->namespacedKey($key); |
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return $this->memcachedInstance->set($key, $value, $ttl); |
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} |
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/** |
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* Return the valid cache value stored with the given key. |
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* |
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* @param string $key the cache key to be found. |
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* |
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* @return mixed the data found. |
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*/ |
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public function get(string $key) |
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{ |
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$key = $this->namespacedKey($key); |
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$value = $this->memcachedInstance->get($key); |
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if ($this->exists($key)) { |
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return $value; |
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} |
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return null; |
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} |
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/** |
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* Delete cache especified by key. |
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* |
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* @param string $key the cache key to be deleted. |
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* |
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* @return bool true on success or false on failure. |
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*/ |
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public function delete(string $key) : bool |
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{ |
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$key = $this->namespacedKey($key); |
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return $this->memcachedInstance->delete($key); |
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} |
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/** |
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* Check if given key exists and is valid on cache. |
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* |
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* @param string $key the cache key to be verified. |
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* @param bool $isValid if set to true the function will verify if it is valid (not expired). |
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* |
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* @return bool true if exists false otherwise. |
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*/ |
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public function exists(string $key, bool $isValid = false) : bool |
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{ |
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$this->memcachedInstance->get($key); |
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return $this->memcachedInstance->getResultCode() !== \Memcached::RES_NOTFOUND; |
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} |
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/** |
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* Renew the cache expiration time. |
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* |
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* @param string $key the cache key to be renewed. |
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* @param int|null $ttl extra time to live in seconds. |
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* |
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* @return bool true on success or false on failure. |
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*/ |
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public function renew(string $key, int $ttl) : bool |
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{ |
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$key = $this->namespacedKey($key); |
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$ttl = $ttl ?? $this->ttl; |
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if ($this->exists($key)) { |
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return $this->memcachedInstance->touch($key, $ttl); |
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} |
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return false; |
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} |
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/** |
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* Clear all cache records.If namespace set, just clear those that starts with the namespace |
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* |
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* @param string|null $namespace the cache namespace. |
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* |
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* @return bool true on success or false on failure. |
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*/ |
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public function clear(string $namespace = null) : bool |
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{ |
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$namespace = $namespace ?? $this->namespace; |
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if ($namespace === null) { |
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return $this->memcachedInstance->flush(); |
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} |
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// Find all keys, iterate and them delete the only ones that starts with the namespace |
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$cacheKeys = $this->memcachedInstance->getAllKeys(); |
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$filteredCacheKeys = array_filter($cacheKeys, function ($key) use ($namespace) { |
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return strpos($key, $namespace) === 0; |
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}); |
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array_walk($filteredCacheKeys, array($this, 'delete')); |
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return true; |
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} |
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/** |
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* Return the key with the namespace. Since Memcached doesn't support namespaces |
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* the method just simulate it by pre-pending some fixed string to the key |
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* |
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* @param string $key the key to prepend the namespace, if necessary |
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* |
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* @return string the "namespaced" key |
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*/ |
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private function namespacedKey(string $key) : string { |
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if ($this->namespace !== null) { |
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return $this->namespace . $key; |
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} |
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return $key; |
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} |
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} |
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nielsenmg /
ezcache
