191 lines
4.1 KiB
PHP
191 lines
4.1 KiB
PHP
<?php
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namespace top\library\cache\driver;
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use top\library\cache\ifs\CacheIfs;
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use top\traits\Instance;
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/**
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* 文件缓存
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* Class File
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* @package top\library\cache
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*/
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class File implements CacheIfs
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{
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use Instance;
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/**
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* 当前实例
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* @var
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*/
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private static $instance;
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/**
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* 默认缓存位置
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* @var null|string
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*/
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private $dir = './runtime/data/';
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/**
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* 复写获取单一实例方法
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* @param null $dir
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* @return mixed
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*/
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public static function instance($dir = null)
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{
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$ident = md5($dir);
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if (!isset(self::$instance[$ident])) {
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self::$instance[$ident] = new self($dir);
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}
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return self::$instance[$ident];
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}
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/**
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* 进行一些初始化操作
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* File constructor.
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* @param null $dir
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*/
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private function __construct($dir = null)
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{
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if ($dir) {
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$this->dir = $dir;
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}
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}
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/**
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* 设置缓存
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* @param string $key
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* @param string $value
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* @param int $timeout
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* @return bool
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*/
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public function set($key, $value, $timeout = 10)
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{
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$this->createCacheDir();
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$filename = $this->getFileName($key);
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if (is_array($value) || is_object($value)) {
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$value = json_encode($value);
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}
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$value = '<?php $timeout = ' . $timeout . '; ?>' . PHP_EOL . $value;
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if (file_put_contents($filename, $value)) {
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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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* 获取缓存
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* @param string $key
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* @param null $callable
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* @return bool|false|string
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*/
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public function get($key = null, $callable = null)
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{
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$filename = $this->getFileName($key);
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// 如果缓存文件存在
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if (file_exists($filename)) {
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// 判断文件是否有效
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if ($this->isTimeOut($key)) {
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// 返回缓存数据
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return $this->getCacheContent($key);
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}
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}
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// 如果缓存不存在或缓存无效并且存在callable
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if (is_callable($callable)) {
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return $callable($this);
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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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* @param string $key
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* @return bool
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*/
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public function remove($key = null)
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{
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$filename = $this->getFileName($key);
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if (file_exists($filename)) {
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@unlink($filename);
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}
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return true;
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}
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/**
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* 判断缓存是否存在/有效
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* @param $key
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* @return bool
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*/
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public function exists($key)
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{
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return $this->isTimeOut($key);
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}
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/**
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* 获取文件缓存内容
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* @param $key
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* @return false|string
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*/
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private function getCacheContent($key)
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{
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$filename = $this->getFileName($key);
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ob_start();
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require $filename;
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$content = ob_get_contents();
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ob_clean();
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$jsonDecode = json_decode($content, true);
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if (is_null($jsonDecode)) {
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return $content;
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}
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return $jsonDecode;
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}
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/**
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* 判断缓存是否超时
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* @param $key
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* @return bool
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*/
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private function isTimeOut($key)
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{
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$filename = $this->getFileName($key);
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if (file_exists($filename)) {
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ob_start();
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require $filename;
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ob_clean();
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$mtime = filemtime($filename);
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if ($timeout == 0) {
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return true;
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} elseif ((time() - $mtime >= $timeout)) {
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// 已超时，删除缓存
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$this->remove($key);
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return false;
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} else {
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return true;
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}
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}
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return false;
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}
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/**
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* 获取缓存文件名称
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* @param $key
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* @return string
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*/
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public function getFileName($key)
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{
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return $this->dir . $key . '.php';
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}
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/**
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* 创建缓存目录
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*/
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private function createCacheDir()
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{
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if (!is_dir($this->dir)) {
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mkdir($this->dir, 0777, true);
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}
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}
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}
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