/**
* Loads a cached resource
*
* @param ResourceInterface $resource
*
* @return array
*/
public function load(ResourceInterface $resource)
{
if (!$resource instanceof CacheResource) {
return array();
}
if (!$this->cache->has($resource->getName())) {
return array();
}
$formulas = unserialize($this->cache->get($resource->getName()));
foreach ($formulas as $idx => $formula) {
$formulas[$idx] = $this->restoreFormulaFilters($formula);
}
return $formulas;
}
/**
* Applies dump filters and returns the asset as a string.
*
* @param FilterInterface|null $additionalFilter
* @return string
*/
public function dump(FilterInterface $additionalFilter = null)
{
$cacheKey = $this->getCacheKey($this->asset, $additionalFilter, 'dump');
if ($this->cache->has($cacheKey)) {
return $this->cache->get($cacheKey);
}
$content = $this->asset->dump($additionalFilter);
$this->cache->set($cacheKey, $content);
return $content;
}
/**
* If we make it here then we have a cached version of this asset
* found in the underlying $cache driver. So we will check the
* header HTTP_IF_MODIFIED_SINCE and if that is not less than
* the last time we cached ($lastModified) then we will exit
* with 304 header.
*
* @param string $key
* @return string
*/
public function get($key)
{
$lastModified = $this->getLastTimeModified($key);
$modifiedSince = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? $_SERVER['HTTP_IF_MODIFIED_SINCE'] : 0;
header('Last-Modified: ' . $lastModified);
if ($modifiedSince >= $lastModified) {
header('HTTP/1.0 304 Not Modified');
exit;
}
return $this->cache->get($key);
}
/**
* Searches a fresh cached file for the given file.
*
* @throws RuntimeException filesystem errors
*/
private function getCache($file)
{
if (null === $this->cache) {
return null;
}
$key = md5($file);
// File already present
if ($this->cache->has($key)) {
list($mtime, $path) = unserialize($this->cache->get($key));
if ($mtime === filemtime($file)) {
return $path;
}
$delete = $this->directory . '/' . $path;
if (file_exists($delete) && false === @unlink($delete)) {
throw new \RuntimeException('Unable to remove file ' . $delete);
}
}
return null;
}
