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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: 15:00 |
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*/ |
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namespace Jenner\SimpleFork\Cache; |
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/** |
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* shared memory cache |
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* |
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* @package Jenner\SimpleFork\Cache |
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*/ |
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class SharedMemory implements CacheInterface |
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{ |
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/** |
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* holds shared memory resource |
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* @var resource |
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*/ |
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protected $shm; |
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/** |
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* shared memory ipc key |
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* @var string |
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*/ |
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protected $client_count_key = 'system_client_count'; |
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/** |
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* memory size |
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* @var int |
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*/ |
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protected $size; |
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/** |
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* @param int $size memory size |
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* @param string $file |
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*/ |
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public function __construct($size = 33554432, $file = __FILE__) |
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{ |
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$this->size = $size; |
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if (function_exists("shm_attach") === false) { |
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$message = "\nYour PHP configuration needs adjustment. " . |
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"See: http://us2.php.net/manual/en/shmop.setup.php. " . |
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"To enable the System V shared memory support compile " . |
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" PHP with the option --enable-sysvshm."; |
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throw new \RuntimeException($message); |
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} |
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$this->attach($file); //create resources (shared memory) |
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} |
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/** |
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* connect shared memory |
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* |
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* @param string $file |
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*/ |
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public function attach($file = __FILE__) |
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{ |
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if (!file_exists($file)) { |
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$touch = touch($file); |
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if (!$touch) { |
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throw new \RuntimeException("file is not exists and it can not be created. file: {$file}"); |
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} |
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} |
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$key = ftok($file, 'a'); |
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$this->shm = shm_attach($key, $this->size); //allocate shared memory |
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} |
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/** |
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* remove shared memory. |
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* you should know that it maybe does not work. |
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* |
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* @return bool |
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*/ |
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public function remove() |
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{ |
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//dallocate shared memory |
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if (!shm_remove($this->shm)) { |
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return false; |
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} |
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$this->dettach(); |
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// shm_remove maybe not working. it likes a php bug. |
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unset($this->shm); |
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return true; |
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} |
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/** |
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* @return bool |
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*/ |
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public function dettach() |
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{ |
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return shm_detach($this->shm); //allocate shared memory |
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} |
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/** |
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* set var |
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* |
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* @param $key |
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* @param $value |
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* @return bool |
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*/ |
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public function set($key, $value) |
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{ |
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return shm_put_var($this->shm, $this->shm_key($key), $value); //store var |
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} |
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/** |
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* generate shm key |
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* |
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* @param $val |
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* @return mixed |
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*/ |
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public function shm_key($val) |
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{ // enable all world langs and chars ! |
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// text to number system. |
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return preg_replace("/[^0-9]/", "", (preg_replace("/[^0-9]/", "", md5($val)) / 35676248) / 619876); |
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} |
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/** |
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* get var |
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* |
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* @param $key |
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* @param null $default |
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* @return bool|mixed |
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*/ |
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public function get($key, $default = null) |
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{ |
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if ($this->has($key)) { |
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return shm_get_var($this->shm, $this->shm_key($key)); |
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} else { |
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return $default; |
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} |
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} |
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/** |
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* has var ? |
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* |
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* @param $key |
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* @return bool |
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*/ |
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public function has($key) |
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{ |
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if (shm_has_var($this->shm, $this->shm_key($key))) { // check is isset |
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return true; |
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} else { |
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return false; |
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} |
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} |
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/** |
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* delete var |
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* |
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* @param $key |
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* @return bool |
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*/ |
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public function delete($key) |
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{ |
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if ($this->has($key)) { |
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return shm_remove_var($this->shm, $this->shm_key($key)); |
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} else { |
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return false; |
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} |
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} |
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/** |
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* init when wakeup |
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*/ |
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public function __wakeup() |
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{ |
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$this->attach(); |
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} |
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} |
huyanping /
simple-fork-php
