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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: CacheShmop.class.php 2728 2012-02-12 04:12:51Z liu21st $
/**
+------------------------------------
* Shmop缓存驱动类
+------------------------------------
*/
class CacheShmop extends Cache {
/**
+----------------------------------------------------------
* 架构函数
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __construct($options='') {
if ( !extension_loaded('shmop') ) {
throw_exception(L('_NOT_SUPPERT_').':shmop');
}
if(!empty($options)){
$options = array(
'size' => C('SHARE_MEM_SIZE'),
'tmp' => TEMP_PATH,
'project' => 's',
'length' =>0,
);
}
$this->options = $options;
$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 $ret;
}
if(isset($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 $value 存储数据
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function set($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);
}
$val[$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 $name 缓存变量名
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function rm($name) {
$lh = $this->_lock();
$val = $this->get();
if (!is_array($val)) $val = array();
unset($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 $name 缓存变量名
+----------------------------------------------------------
* @return integer|boolen
+----------------------------------------------------------
*/
private function _write(&$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 boolen
+----------------------------------------------------------
*/
private function _lock() {
if (function_exists('sem_get')) {
$fp = sem_get($this->handler, 1, 0600, 1);
sem_acquire ($fp);
} else {
$fp = fopen($this->options['tmp'].$this->prefix.md5($this->handler), 'w');
flock($fp, LOCK_EX);
}
return $fp;
}
/**
+----------------------------------------------------------
* 解除共享锁定
+----------------------------------------------------------
* @access private
+----------------------------------------------------------
* @param string $name 缓存变量名
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
private function _unlock(&$fp) {
if (function_exists('sem_release')) {
sem_release($fp);
} else {
fclose($fp);
}
}
}
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