public function getData()
{
if (!$this->_options->isCacheEnabled() || !$this->_dataSource instanceof Cachable) {
return $this->_dataSource->getData();
}
$cacheDir = $this->_options->getCacheDir();
$cacheKey = $this->_dataSource->getCacheKey();
$cacheFile = $cacheDir . '/' . $cacheKey . '.sengincache';
if (is_file($cacheFile)) {
$expirationTime = $this->_options->getExpirationTime();
$lastModificationTime = time() - filemtime($cacheFile);
if ($lastModificationTime <= $expirationTime) {
// from cache
return file_get_contents($cacheFile);
}
// cache expired, remove cache data
unlink($cacheFile);
}
$data = $this->_dataSource->getData();
// save cache data
file_put_contents($cacheFile, $data);
return $data;
}
