發個PHP緩衝實現,實現了apc和檔案快取,繼承Cache_Abstract即可實現調用第三方的緩衝工具。
參考shindig的緩衝類和apc。
Php代碼
- class CacheException extends Exception {}
- /**
- * 緩衝抽象類別
- */
- abstract class Cache_Abstract {
- /**
- * 讀緩衝變數
- *
- * @param string $key 緩衝下標
- * @return mixed
- */
- abstract public function fetch($key);
-
- /**
- * 緩衝變數
- *
- * @param string $key 緩衝變數下標
- * @param string $value 緩衝變數的值
- * @return bool
- */
- abstract public function store($key, $value);
-
- /**
- * 刪除緩衝變數
- *
- * @param string $key 緩衝下標
- * @return Cache_Abstract
- */
- abstract public function delete($key);
-
- /**
- * 清(刪)除所有緩衝
- *
- * @return Cache_Abstract
- */
- abstract public function clear();
-
- /**
- * 鎖定緩衝變數
- *
- * @param string $key 緩衝下標
- * @return Cache_Abstract
- */
- abstract public function lock($key);
-
- /**
- * 緩衝變數解鎖
- *
- * @param string $key 緩衝下標
- * @return Cache_Abstract
- */
- abstract public function unlock($key);
-
- /**
- * 取得緩衝變數是否被鎖定
- *
- * @param string $key 緩衝下標
- * @return bool
- */
- abstract public function isLocked($key);
-
- /**
- * 確保不是鎖定狀態
- * 最多做$tries次睡眠等待解鎖,逾時則跳過並解鎖
- *
- * @param string $key 緩衝下標
- */
- public function checkLock($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鎖,逾時則跳過並解鎖
-
- $this->isLocked($key) && $this->unlock($key);
-
- return $this;
- }
- }
-
-
- /**
- * APC擴充緩衝實現
- *
- *
- * @category Mjie
- * @package Cache
- * @author 流水孟春
- * @copyright Copyright (c) 2008-
- * @license New BSD License
- * @version $Id: Cache/Apc.php 版本號碼 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');
- }
- }
-
- /**
- * 儲存緩衝變數
- *
- * @param string $key
- * @param mixed $value
- * @return bool
- */
- public function store($key, $value) {
- return apc_store($this->_storageKey($key), $value);
- }
-
- /**
- * 讀取緩衝
- *
- * @param string $key
- * @return mixed
- */
- public function fetch($key) {
- return apc_fetch($this->_storageKey($key));
- }
-
- /**
- * 清除緩衝
- *
- * @return Cache_Apc
- */
- public function clear() {
- apc_clear_cache();
- return $this;
- }
-
- /**
- * 刪除緩衝單元
- *
- * @return Cache_Apc
- */
- public function delete($key) {
- apc_delete($this->_storageKey($key));
- return $this;
- }
-
- /**
- * 緩衝單元是否被鎖定
- *
- * @param string $key
- * @return bool
- */
- public function isLocked($key) {
- if ((apc_fetch($this->_storageKey($key) . '.lock')) === false) {
- return false;
- }
-
- return true;
- }
-
- /**
- * 鎖定緩衝單元
- *
- * @param string $key
- * @return Cache_Apc
- */
- public function lock($key) {
- apc_store($this->_storageKey($key) . '.lock', '', 5);
- return $this;
- }
-
- /**
- * 緩衝單元解鎖
- *
- * @param string $key
- * @return Cache_Apc
- */
- public function unlock($key) {
- apc_delete($this->_storageKey($key) . '.lock');
- return $this;
- }
-
- /**
- * 完整緩衝名
- *
- * @param string $key
- * @return string
- */
- private function _storageKey($key) {
- return $this->_prefix . '_' . $key;
- }
- }
-
- /**
- * 檔案快取實現
- *
- *
- * @category Mjie
- * @package Cache
- * @author 流水孟春
- * @copyright Copyright (c) 2008-
- * @license New BSD License
- * @version $Id: Cache/File.php 版本號碼 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');
- }
- }
-
- /**
- * 擷取快取檔案
- *
- * @param string $key
- * @return string
- */
- protected function _getCacheFile($key) {
- $subdir = $this->useSubdir ? substr($key, 0, 2) . '/' : '';
- return $this->_cachesDir . '/' . $subdir . $key . '.php';
- }
-
- /**
- * 讀取緩衝變數
- * 為防止資訊泄露,快取檔案格式為php檔案,並以""開頭
- *
- * @param string $key 緩衝下標
- * @return mixed
- */
- public function fetch($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;
- }
-
- /**
- * 緩衝變數
- * 為防止資訊泄露,快取檔案格式為php檔案,並以""開頭
- *
- * @param string $key 緩衝變數下標
- * @param string $value 緩衝變數的值
- * @return bool
- */
- public function store($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($cacheFile, '
-
- return @file_put_contents($cacheFile, '' . serialize($value));
- }
-
- /**
- * 刪除緩衝變數
- *
- * @param string $key 緩衝下標
- * @return Cache_File
- */
- public function delete($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;
- }
-
- /**
- * 緩衝單元是否已經鎖定
- *
- * @param string $key
- * @return bool
- */
- public function isLocked($key) {
- $cacheFile = self::_getCacheFile($key);
- clearstatcache();
- return file_exists($cacheFile . '.lock');
- }
-
- /**
- * 鎖定
- *
- * @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($cacheDir)) {
- throw new CacheException("Could not make cache directory");
- }
- }
- }
-
- // 設定緩衝鎖檔案的訪問和修改時間
- @touch($cacheFile . '.lock');
- return $this;
- }
-
- /**
- * 解鎖
- *
- * @param string $key
- * @return Cache_File
- */
- public function unlock($key) {
- $cacheFile = self::_getCacheFile($key);
- @unlink($cacheFile . '.lock');
- return
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