<?php
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/**
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* PhalApi_Cache_File 文件缓存
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*
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* @package PhalApi\Cache
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* @license http://www.phalapi.net/license GPL 协议
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* @link http://www.phalapi.net/
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* @author dogstar <chanzonghuang@gmail.com> 2015-02-26
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*/
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class PhalApi_Cache_File implements PhalApi_Cache {
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protected $folder;
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protected $prefix;
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public function __construct($config) {
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$this->folder = rtrim($config['path'], '/');
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$cacheFolder = $this->createCacheFileFolder();
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if (!is_dir($cacheFolder)) {
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mkdir($cacheFolder, 0777, TRUE);
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}
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$this->prefix = isset($config['prefix']) ? $config['prefix'] : 'phapapi';
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}
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public function set($key, $value, $expire = 600) {
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if ($key === NULL || $key === '') {
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return;
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}
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$filePath = $this->createCacheFilePath($key);
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$expireStr = sprintf('%010d', $expire + time());
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if (strlen($expireStr) > 10) {
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throw new PhalApi_Exception_InternalServerError(
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T('file expire is too large')
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);
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}
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if (!file_exists($filePath)) {
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touch($filePath);
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chmod($filePath, 0777);
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}
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file_put_contents($filePath, $expireStr . serialize($value));
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}
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public function get($key) {
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$filePath = $this->createCacheFilePath($key);
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if (file_exists($filePath)) {
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$expireTime = file_get_contents($filePath, FALSE, NULL, 0, 10);
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if ($expireTime > time()) {
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return @unserialize(file_get_contents($filePath, FALSE, NULL, 10));
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}
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}
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return NULL;
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}
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public function delete($key) {
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if ($key === NULL || $key === '') {
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return;
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}
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$filePath = $this->createCacheFilePath($key);
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@unlink($filePath);
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}
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/**
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* 考虑到Linux同一目录下的文件个数限制，这里拆分成1000个文件缓存目录
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*/
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protected function createCacheFilePath($key) {
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$folderSufix = sprintf('%03d', hexdec(substr(sha1($key), -5)) % 1000);
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$cacheFolder = $this->createCacheFileFolder() . DIRECTORY_SEPARATOR . $folderSufix;
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if (!is_dir($cacheFolder)) {
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mkdir($cacheFolder, 0777, TRUE);
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}
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return $cacheFolder . DIRECTORY_SEPARATOR . md5($key) . '.dat';
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}
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protected function createCacheFileFolder() {
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return $this->folder . DIRECTORY_SEPARATOR . 'cache';
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}
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}
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