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<?php |
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/** |
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* Created by PhpStorm. |
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* User: Jenner |
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* Date: 2015/8/12 |
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* Time: 20:52 |
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*/ |
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namespace Jenner\SimpleFork\Lock; |
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/** |
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* sem lock |
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* |
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* @package Jenner\SimpleFork\Lock |
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*/ |
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class Semaphore implements LockInterface |
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{ |
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/** |
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* @var |
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*/ |
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private $lock_id; |
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/** |
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* @var bool |
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*/ |
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private $locked = false; |
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/** |
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* init a lock |
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* |
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* @param $key |
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* @param $count |
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* @throws \RuntimeException |
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*/ |
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private function __construct($key, $count = 1) |
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{ |
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if (($this->lock_id = sem_get($this->_stringToSemKey($key), $count)) === false) { |
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throw new \RuntimeException("Cannot create semaphore for key: {$key}"); |
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} |
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} |
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/** |
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* Semaphore requires a numeric value as the key |
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* |
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* @param $identifier |
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* @return int |
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*/ |
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protected function _stringToSemKey($identifier) |
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{ |
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$md5 = md5($identifier); |
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$key = 0; |
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for ($i = 0; $i < 32; $i++) { |
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$key += ord($md5{$i}) * $i; |
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} |
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return $key; |
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} |
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/** |
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* create a lock instance |
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* |
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* @param $key |
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* @return Semaphore |
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*/ |
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public static function create($key) |
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{ |
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return new Semaphore($key); |
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} |
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/** |
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* release lock |
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* |
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* @throws \RuntimeException |
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*/ |
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public function __destruct() |
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{ |
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if ($this->isLocked()) { |
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$this->release(); |
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} |
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} |
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/** |
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* is locked |
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* |
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* @return bool |
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*/ |
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public function isLocked() |
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{ |
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return $this->locked === true ? true : false; |
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} |
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/** |
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* release lock |
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* |
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* @return bool |
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* @throws \RuntimeException |
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*/ |
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View Code Duplication |
public function release() |
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{ |
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if (!$this->locked) { |
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throw new \RuntimeException("release a non lock"); |
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} |
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if (!sem_release($this->lock_id)) { |
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return false; |
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} |
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$this->locked = false; |
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return true; |
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} |
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/** |
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* get a lock |
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* |
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* @param bool $blocking |
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* @return bool |
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*/ |
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public function acquire($blocking = true) |
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{ |
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if ($this->locked) { |
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throw new \RuntimeException('already lock by yourself'); |
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} |
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if ($blocking === false) { |
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if (version_compare(PHP_VERSION, '5.6.0') < 0) { |
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throw new \RuntimeException('php version is at least 5.6.0 for param blocking'); |
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} |
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if (!sem_acquire($this->lock_id, true)) { |
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return false; |
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} |
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$this->locked = true; |
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return true; |
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} |
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if (!sem_acquire($this->lock_id)) { |
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return false; |
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} |
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$this->locked = true; |
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return true; |
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} |
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/** |
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* remove the semaphore resource |
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* |
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* @return bool |
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*/ |
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View Code Duplication |
public function remove() |
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{ |
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if ($this->locked) { |
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throw new \RuntimeException('can not remove a locked semaphore resource'); |
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} |
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if (!is_resource($this->lock_id)) { |
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throw new \RuntimeException('can not remove a empty semaphore resource'); |
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} |
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if (!sem_release($this->lock_id)) { |
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return false; |
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} |
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return true; |
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} |
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} |
huyanping /
simple-fork-php
Loading history...
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.