- <?php
- class CacheException extends Exception {
- }
- /**
- * 缓存抽象类
- */
- abstract class Cache_Abstract {
- /**
- * 读缓存变量
- *
- * @param string $key 缓存下标
- * @return mixed
- */
- abstract public function fetch($key);
- /**
- * 缓存变量
- *
- * @param string $key 缓存变量下标
- * @param string $value 缓存变量的值
- * @return bool
- */
- abstract public function store($key, $value);
- /**
- * 删除缓存变量
- *
- * @param string $key 缓存下标
- * @return Cache_Abstract
- */
- abstract public function delete($key);
- /**
- * 清(删)除所有缓存
- *
- * @return Cache_Abstract
- */
- abstract public function clear();
- /**
- * 锁定缓存变量
- *
- * @param string $key 缓存下标
- * @return Cache_Abstract
- */
- abstract public function lock($key);
- /**
- * 缓存变量解锁
- *
- * @param string $key 缓存下标
- * @return Cache_Abstract
- */
- abstract public function unlock($key);
- /**
- * 取得缓存变量是否被锁定
- *
- * @param string $key 缓存下标
- * @return bool
- */
- abstract public function isLocked($key);
- /**
- * 确保不是锁定状态
- * 最多做$tries次睡眠等待解锁,超时则跳过并解锁
- *
- * @param string $key 缓存下标
- */
- public function checkLock($key) {
- if (!$this -> isLocked($key)) {
- return $this;
- }
- $tries = 10;
- $count = 0;
- do {
- usleep(200);
- $count++;
- } while ($count <= $tries && $this->isLocked($key));// 最多做十次睡眠等待解锁,超时则跳过并解锁
- $this -> isLocked($key) && $this -> unlock($key);
- return $this;
- }
- }
- /**
- * APC扩展缓存实现
- *
- *
- * @category Mjie
- * @package Cache
- * @author 流水孟春
- * @copyright Copyright (c) 2008- <cmpan(at)qq.com>
- * @license New BSD License
- * @version $Id: Cache/Apc.php 版本号 2010-04-18 23:02 cmpan $
- */
- class Cache_Apc extends Cache_Abstract {
- protected $_prefix = 'cache.mjie.net';
- public function __construct() {
- if (!function_exists('apc_cache_info')) {
- throw new CacheException('apc extension didn't installed');
- }
- }
- /**
- * 保存缓存变量
- *
- * @param string $key
- * @param mixed $value
- * @return bool
- */
- public function store($key, $value) {
- return apc_store($this -> _storageKey($key), $value);
- }
- /**
- * 读取缓存
- *
- * @param string $key
- * @return mixed
- */
- public function fetch($key) {
- return apc_fetch($this -> _storageKey($key));
- }
- /**
- * 清除缓存
- *
- * @return Cache_Apc
- */
- public function clear() {
- apc_clear_cache();
- return $this;
- }
- /**
- * 删除缓存单元
- *
- * @return Cache_Apc
- */
- public function delete($key) {
- apc_delete($this -> _storageKey($key));
- return $this;
- }
- /**
- * 缓存单元是否被锁定
- *
- * @param string $key
- * @return bool
- */
- public function isLocked($key) {
- if ((apc_fetch($this -> _storageKey($key) . '.lock')) === false) {
- return false;
- }
- return true;
- }
- /**
- * 锁定缓存单元
- *
- * @param string $key
- * @return Cache_Apc
- */
- public function lock($key) {
- apc_store($this -> _storageKey($key) . '.lock', '', 5);
- return $this;
- }
- /**
- * 缓存单元解锁
- *
- * @param string $key
- * @return Cache_Apc
- */
- public function unlock($key) {
- apc_delete($this -> _storageKey($key) . '.lock');
- return $this;
- }
- /**
- * 完整缓存名
- *
- * @param string $key
- * @return string
- */
- private function _storageKey($key) {
- return $this -> _prefix . '_' . $key;
- }
- }
- /**
- * 文件缓存实现
- *
- *
- * @category Mjie
- * @package Cache
- * @author 流水孟春
- * @copyright Copyright (c) 2008- <cmpan(at)qq.com>
- * @license New BSD License
- * @version $Id: Cache/File.php 版本号 2010-04-18 16:46 cmpan $
- */
- class Cache_File extends Cache_Abstract {
- public $useSubdir = false;
- protected $_cachesDir = 'cache';
- public function __construct() {
- if (defined('DATA_DIR')) {
- $this -> _setCacheDir(DATA_DIR . '/cache');
- }
- }
- /**
- * 获取缓存文件
- *
- * @param string $key
- * @return string
- */
- protected function _getCacheFile($key) {
- $subdir = $this -> useSubdir ? substr($key, 0, 2) . '/' : '';
- return $this -> _cachesDir . '/' . $subdir . $key . '.php';
- }
- /**
- * 读取缓存变量
- * 为防止信息泄露,缓存文件格式为php文件,并以"<?php exit;?>"开头
- *
- * @param string $key 缓存下标
- * @return mixed
- */
- public function fetch($key) {
- $cacheFile = self::_getCacheFile($key);
- if (file_exists($cacheFile) && is_readable($cacheFile)) {
- // include 方式
- //return include $cacheFile;
- // 系列化方式
- return unserialize(@file_get_contents($cacheFile, false, NULL, 13));
- }
- return false;
- }
- /**
- * 缓存变量
- * 为防止信息泄露,缓存文件格式为php文件,并以"<?php exit;?>"开头
- *
- * @param string $key 缓存变量下标
- * @param string $value 缓存变量的值
- * @return bool
- */
- public function store($key, $value) {
- $cacheFile = self::_getCacheFile($key);
- $cacheDir = dirname($cacheFile);
- if (!is_dir($cacheDir)) {
- if (!@mkdir($cacheDir, 0755, true)) {
- throw new CacheException("Could not make cache directory");
- }
- }
- // 用include方式
- //return @file_put_contents($cacheFile, '<?php return ' . var_export($value, true). ';');
- return @file_put_contents($cacheFile, '<?php exit;?>' . serialize($value));
- }
- /**
- * 删除缓存变量
- *
- * @param string $key 缓存下标
- * @return Cache_File
- */
- public function delete($key) {
- if (emptyempty($key)) {
- throw new CacheException("Missing argument 1 for Cache_File::delete()");
- }
- $cacheFile = self::_getCacheFile($key);
- if (!@unlink($cacheFile)) {
- throw new CacheException("Cache file could not be deleted");
- }
- return $this;
- }
- /**
- * 缓存单元是否已经锁定
- *
- * @param string $key
- * @return bool
- */
- public function isLocked($key) {
- $cacheFile = self::_getCacheFile($key);
- clearstatcache();
- return file_exists($cacheFile . '.lock');
- }
- /**
- * 锁定
- *
- * @param string $key
- * @return Cache_File
- */
- public function lock($key) {
- $cacheFile = self::_getCacheFile($key);
- $cacheDir = dirname($cacheFile);
- if (!is_dir($cacheDir)) {
- if (!@mkdir($cacheDir, 0755, true)) {
- if (!is_dir($cacheDir)) {
- throw new CacheException("Could not make cache directory");
- }
- }
- }
- // 设定缓存锁文件的访问和修改时间
- @touch($cacheFile . '.lock');
- return $this;
- }
- /**
- * 解锁
- *
- * @param string $key
- * @return Cache_File
- */
- public function unlock($key) {
- $cacheFile = self::_getCacheFile($key);
- @unlink($cacheFile . '.lock');
- return $this;
- }
- /**
- * 设置文件缓存目录
- * @param string $dir
- * @return Cache_File
- */
- protected function _setCacheDir($dir) {
- $this -> _cachesDir = rtrim(str_replace('\\', '/', trim($dir)), '/');
- clearstatcache();
- if (!is_dir($this -> _cachesDir)) {
- mkdir($this -> _cachesDir, 0755, true);
- }
- //
- return $this;
- }
- /**
- * 清空所有缓存
- *
- * @return Cache_File
- */
- public function clear() {
- // 遍历目录清除缓存
- $cacheDir = $this -> _cachesDir;
- $d = dir($cacheDir);
- while (false !== ($entry = $d -> read())) {
- if ('.' == $entry[0]) {
- continue;
- }
- $cacheEntry = $cacheDir . '/' . $entry;
- if (is_file($cacheEntry)) {
- @unlink($cacheEntry);
- } elseif (is_dir($cacheEntry)) {
- // 缓存文件夹有两级
- $d2 = dir($cacheEntry);
- while (false !== ($entry = $d2 -> read())) {
- if ('.' == $entry[0]) {
- continue;
- }
- $cacheEntry .= '/' . $entry;
- if (is_file($cacheEntry)) {
- @unlink($cacheEntry);
- }
- }
- $d2 -> close();
- }
- }
- $d -> close();
- return $this;
- }
- }
- /**
- * 缓存单元的数据结构
- * array(
- * 'time' => time(), // 缓存写入时的时间戳
- * 'expire' => $expire, // 缓存过期时间
- * 'valid' => true, // 缓存是否有效
- * 'data' => $value // 缓存的值
- * );
- */
- final class Cache {
- /**
- * 缓存过期时间长度(s)
- *
- * @var int
- */
- private $_expire = 3600;
- /**
- * 缓存处理类
- *
- * @var Cache_Abstract
- */
- private $_storage = null;
- /**
- * @return Cache
- */
- static public function createCache($cacheClass = 'Cache_File') {
- return new self($cacheClass);
- }
- private function __construct($cacheClass) {
- $this -> _storage = new $cacheClass();
- }
- /**
- * 设置缓存
- *
- * @param string $key
- * @param mixed $value
- * @param int $expire
- */
- public function set($key, $value, $expire = false) {
- if (!$expire) {
- $expire = $this -> _expire;
- }
- $this -> _storage -> checkLock($key);
- $data = array('time' => time(), 'expire' => $expire, 'valid' => true, 'data' => $value);
- $this -> _storage -> lock($key);
- try {
- $this -> _storage -> store($key, $data);
- $this -> _storage -> unlock($key);
- } catch (CacheException $e) {
- $this -> _storage -> unlock($key);
- throw $e;
- }
- }
- /**
- * 读取缓存
- *
- * @param string $key
- * @return mixed
- */
- public function get($key) {
- $data = $this -> fetch($key);
- if ($data && $data['valid'] && !$data['isExpired']) {
- return $data['data'];
- }
- return false;
- }
- /**
- * 读缓存,包括过期的和无效的,取得完整的存贮结构
- *
- * @param string $key
- */
- public function fetch($key) {
- $this -> _storage -> checkLock($key);
- $data = $this -> _storage -> fetch($key);
- if ($data) {
- $data['isExpired'] = (time() - $data['time']) > $data['expire'] ? true : false;
- return $data;
- }
- return false;
- }
- /**
- * 删除缓存
- *
- * @param string $key
- */
- public function delete($key) {
- $this -> _storage -> checkLock($key) -> lock($key) -> delete($key) -> unlock($key);
- }
- public function clear() {
- $this -> _storage -> clear();
- }
- /**
- * 把缓存设为无效
- *
- * @param string $key
- */
- public function setInvalidate($key) {
- $this -> _storage -> checkLock($key) -> lock($key);
- try {
- $data = $this -> _storage -> fetch($key);
- if ($data) {
- $data['valid'] = false;
- $this -> _storage -> store($key, $data);
- }
- $this -> _storage -> unlock($key);
- } catch (CacheException $e) {
- $this -> _storage -> unlock($key);
- throw $e;
- }
- }
- /**
- * 设置缓存过期时间(s)
- *
- * @param int $expire
- */
- public function setExpire($expire) {
- $this -> _expire = (int)$expire;
- return $this;
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/211120137380.html
来源: http://www.codesnippet.cn/detail/211120137380.html