Shmop.class.php
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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Think\Cache\Driver;
use Think\Cache;
defined('THINK_PATH') or exit();
/**
* Shmop缓存驱动
*/
class Shmop extends Cache
{
/**
* 架构函数
*
* @param array $options
* 缓存参数
* @access public
*/
public function __construct($options = array())
{
if (! extension_loaded('shmop')) {
E(L('_NOT_SUPPORT_') . ':shmop');
}
if (! empty($options)) {
$options = array(
'size' => C('SHARE_MEM_SIZE'),
'temp' => TEMP_PATH,
'project' => 's',
'length' => 0
);
}
$this->options = $options;
$this->options['prefix'] = isset($options['prefix']) ? $options['prefix'] : C('DATA_CACHE_PREFIX');
$this->options['length'] = isset($options['length']) ? $options['length'] : 0;
$this->handler = $this->_ftok($this->options['project']);
}
/**
* 读取缓存
*
* @access public
* @param string $name
* 缓存变量名
* @return mixed
*/
public function get($name = false)
{
N('cache_read', 1);
$id = shmop_open($this->handler, 'c', 0600, 0);
if ($id !== false) {
$ret = unserialize(shmop_read($id, 0, shmop_size($id)));
shmop_close($id);
if ($name === false) {
return $ret;
}
$name = $this->options['prefix'] . $name;
if (isset($ret[$name])) {
$content = $ret[$name];
if (C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
// 启用数据压缩
$content = gzuncompress($content);
}
return $content;
} else {
return null;
}
} else {
return false;
}
}
/**
* 写入缓存
*
* @access public
* @param string $name
* 缓存变量名
* @param mixed $value
* 存储数据
* @return boolean
*/
public function set($name, $value)
{
N('cache_write', 1);
$lh = $this->_lock();
$val = $this->get();
if (! is_array($val)) {
$val = array();
}
if (C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
// 数据压缩
$value = gzcompress($value, 3);
}
$name = $this->options['prefix'] . $name;
$val[$name] = $value;
$val = serialize($val);
if ($this->_write($val, $lh)) {
if ($this->options['length'] > 0) {
// 记录缓存队列
$this->queue($name);
}
return true;
}
return false;
}
/**
* 删除缓存
*
* @access public
* @param string $name
* 缓存变量名
* @return boolean
*/
public function rm($name)
{
$lh = $this->_lock();
$val = $this->get();
if (! is_array($val)) {
$val = array();
}
$name = $this->options['prefix'] . $name;
unset($val[$name]);
$val = serialize($val);
return $this->_write($val, $lh);
}
/**
* 生成IPC key
*
* @access private
* @param string $project
* 项目标识名
* @return integer
*/
private function _ftok($project)
{
if (function_exists('ftok')) {
return ftok(__FILE__, $project);
}
if (strtoupper(PHP_OS) == 'WINNT') {
$s = stat(__FILE__);
return sprintf("%u", (($s['ino'] & 0xffff) | (($s['dev'] & 0xff) << 16) | (($project & 0xff) << 24)));
} else {
$filename = __FILE__ . (string) $project;
for ($key = array(); sizeof($key) < strlen($filename); $key[] = ord(substr($filename, sizeof($key), 1))) {
;
}
return dechex(array_sum($key));
}
}
/**
* 写入操作
*
* @access private
* @param string $name
* 缓存变量名
* @return integer|boolean
*/
private function _write(&$val, &$lh)
{
$id = shmop_open($this->handler, 'c', 0600, $this->options['size']);
if ($id) {
$ret = shmop_write($id, $val, 0) == strlen($val);
shmop_close($id);
$this->_unlock($lh);
return $ret;
}
$this->_unlock($lh);
return false;
}
/**
* 共享锁定
*
* @access private
* @param string $name
* 缓存变量名
* @return boolean
*/
private function _lock()
{
if (function_exists('sem_get')) {
$fp = sem_get($this->handler, 1, 0600, 1);
sem_acquire($fp);
} else {
$fp = fopen($this->options['temp'] . $this->options['prefix'] . md5($this->handler), 'w');
flock($fp, LOCK_EX);
}
return $fp;
}
/**
* 解除共享锁定
*
* @access private
* @param string $name
* 缓存变量名
* @return boolean
*/
private function _unlock(&$fp)
{
if (function_exists('sem_release')) {
sem_release($fp);
} else {
fclose($fp);
}
}
}