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