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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 $this->locked === true ? true : false; |
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} |
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/** |
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* release lock |
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* |
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* @return bool |
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* @throws \RuntimeException |
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*/ |
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public function release() |
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{ |
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if (!$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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6 |
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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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} |
huyanping /
simple-fork-php
