/**
* create / recreate the cache directory
* this way the app doesn't have to create
* the next time a manipulated image is requested
*
* @return void
*/
private function createCacheDir()
{
if (!$this->dirExists($srcPath = $this->server->getSourcePathPrefix())) {
$this->filesystem()->createDir($srcPath);
}
$this->filesystem()->createDir($this->server->getCachePathPrefix());
}