/**
* 获取缓存文件路径
* @param string $key
* @param string $extension 缓存后缀
* @return string
*/
public function getCacheFile($key = null, $extension = '.cache')
{
$cacheDir = $this->configs['cache_dir'];
/**
* 1. 如果有传入了缓存key,则默认为公共缓存，缓存文件全部放入公共缓存中
* 2. 如果key=null,则认为是模块的特殊缓存，按照模块将缓存分类
*/
if ($key) {
$dir = getHashCode($key) % self::$_FILE_OPACITY;
$cacheDir .= "common/{$dir}/";
return $cacheDir . "{$key}.cache";
} else {
$cacheDir .= $this->baseKey . '/';
$filename = $this->baseKey;
if ($this->ftype) {
$cacheDir .= $this->ftype . '/';
$filename .= '_' . $this->ftype;
}
if ($this->factor) {
if (is_numeric($this->factor)) {
$cacheDir .= $this->factor % self::$_FILE_OPACITY . '/';
} else {
$factor = HashUtils::BKDRHash($this->factor);
$cacheDir .= $factor % self::$_FILE_OPACITY . '/';
}
$filename .= '_' . $this->factor;
}
return $cacheDir . $filename . $extension;
}
}
/**
* 计算字符串的hash值
* @param string $str
* @return int
*/
function getHashCode($str)
{
return \herosphp\utils\HashUtils::BKDRHash($str);
}