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<?php |
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namespace nebula\application\cache; |
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use nebula\application\filesystem\FileSystem; |
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use nebula\component\cacheable\CacheInterface; |
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/** |
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* 文件缓存 |
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* |
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* 由于访问数据库的效率远远低于访问文件的效率，所以我添加了一个文件缓存类， |
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* 你可以把常用的数据和更改很少的数据查询数据库以后缓存到文件里面，用来加快页面加载速度。 |
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*/ |
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class FileCache implements CacheInterface |
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{ |
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protected $path; |
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protected $value; |
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protected $defaultLiveTime = 3600; |
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public function __construct(string $path, int $live = 3600) |
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{ |
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$this->path = $path; |
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$this->defaultLiveTime = $live; |
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FileSystem::makes($path); |
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} |
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/** |
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* 设置 |
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* @param string $name 名 |
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* @param mixed $value 值 |
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* @param int $expire 过期时间 |
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* @return bool |
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*/ |
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public function set(string $name, $value, int $expire=null):bool |
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{ |
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if ($this->disable()) { |
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return false; |
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} |
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$path=$this->getPath($name); |
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$this->value[$name]=$value; |
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FileSystem::makes(dirname($path)); |
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$value=serialize($value); |
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if (is_null($expire)) { |
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$expire=time() + $this->defaultLiveTime; |
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} |
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return file_put_contents($path, $expire.'|'.$value)!==false; |
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} |
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/** |
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* 获取值 |
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* @param string $name 名 |
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* @return mixed|null |
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*/ |
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public function get(string $name, $defalut=null) |
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{ |
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// 有值就获取值 |
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if (array_key_exists($name, $this->value)) { |
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$value=$this->value[$name]; |
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return $value; |
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} |
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// 没值就在cache文件中查找 |
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$path=$this->getPath($name); |
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if (FileSystem::exist($path)) { |
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$value=FileSystem::get($path); |
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list($time, $value)=explode('|', $value, 2); |
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if (time()<intval($time)) { |
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// 未过期则返回 |
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return unserialize($value); |
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} else { |
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// 过期则删除 |
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$this->delete($path); |
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} |
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} |
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// 返回默认值 |
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return $defalut; |
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} |
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/** |
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* 删除值 |
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* @param string $name 名 |
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* @return bool |
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*/ |
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public function delete(string $name) :bool |
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{ |
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return FileSystem::delete($this->getPath($name)); |
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} |
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/** |
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* 检测是否存在 |
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* |
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* @param string $name |
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* @return bool |
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*/ |
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public function has(string $name):bool |
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{ |
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return $this->get($name)!==null; |
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} |
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/** |
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* 垃圾回收 |
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*/ |
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public function gc() |
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{ |
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$files=FileSystem::readFiles($this->path, true); |
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foreach ($files as $file) { |
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$value=FileSystem::get($file); |
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list($time, $value)=explode('|', $value, 2); |
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if (time()>intval($time)) { |
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FileSystem::delete($file); |
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} |
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} |
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} |
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public function clear() |
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{ |
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FileSystem::delete($this->path); |
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} |
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public function enable():bool |
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{ |
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return is_writable($this->path); |
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} |
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public function disable():bool |
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{ |
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return !$this->enable(); |
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} |
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private function getPath(string $name) |
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{ |
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if (strpos($name, '.')) { |
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list($main, $sub)=explode('.', $name, 2); |
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} else { |
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$main=$name; |
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$sub=$name; |
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} |
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$fname= $this->path.'/'.substr(md5($main), 0, 8).'-'.substr(md5($sub), 0, 4).'.cache'; |
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return $fname; |
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} |
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} |
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dxkite /
suda
