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<?php |
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/** |
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* This file is part of ninja-mutex. |
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* |
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* (C) Kamil Dziedzic <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace NinjaMutex\Lock; |
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use Memcache; |
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/** |
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* Lock implementor using Memcache |
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* |
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* @author Kamil Dziedzic <[email protected]> |
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*/ |
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class MemcacheLock extends LockAbstract implements LockExpirationInterface |
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{ |
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/** |
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* Maximum expiration time in seconds (30 days) |
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* http://php.net/manual/en/memcache.add.php |
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*/ |
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const MAX_EXPIRATION = 2592000; |
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/** |
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* Memcache connection |
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* |
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* @var Memcache |
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*/ |
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protected $memcache; |
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/** |
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* @var int Expiration time of the lock in seconds |
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*/ |
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protected $expiration = 0; |
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/** |
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* @param Memcache $memcache |
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*/ |
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public function __construct($memcache) |
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{ |
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parent::__construct(); |
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$this->memcache = $memcache; |
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} |
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/** |
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* @param int $expiration Expiration time of the lock in seconds. If it's equal to zero (default), the lock will never expire. |
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* Max 2592000s (30 days), if greater it will be capped to 2592000 without throwing an error. |
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* WARNING: Using value higher than 0 may lead to race conditions. If you set too low expiration time |
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* e.g. 30s and critical section will run for 31s another process will gain lock at the same time, |
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* leading to unpredicted behaviour. Use with caution. |
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*/ |
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public function setExpiration($expiration) |
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{ |
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if ($expiration > static::MAX_EXPIRATION) { |
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$expiration = static::MAX_EXPIRATION; |
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} |
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$this->expiration = $expiration; |
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} |
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/** |
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* Clear lock without releasing it |
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* Do not use this method unless you know what you do |
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* |
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* @param string $name name of lock |
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* @return bool |
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*/ |
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public function clearLock($name) |
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{ |
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if (!isset($this->locks[$name])) { |
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return false; |
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} |
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unset($this->locks[$name]); |
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return true; |
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} |
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/** |
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* @param string $name name of lock |
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* @param bool $blocking |
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* @return bool |
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*/ |
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protected function getLock($name, $blocking) |
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{ |
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if (!$this->memcache->add($name, serialize($this->getLockInformation()), 0, $this->expiration)) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Release lock |
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* |
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* @param string $name name of lock |
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* @return bool |
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*/ |
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public function releaseLock($name) |
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{ |
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if (isset($this->locks[$name]) && $this->memcache->delete($name)) { |
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unset($this->locks[$name]); |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Check if lock is locked |
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* |
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* @param string $name name of lock |
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* @return bool |
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*/ |
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public function isLocked($name) |
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{ |
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return false !== $this->memcache->get($name); |
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} |
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} |
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arvenil /
ninja-mutex
