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<?php
class FileSystemDataStore implements DataStore
{
private $prefix;
private $files_cache;
public function __construct($id)
{
$this->prefix = $id;
$this->files_cache = new RAMDataStore();
}
public function get($id)
{
if ($this->contains($id))
{
return $this->get_data($id);
}
throw new RAMCacheException($id);
}
private function get_data($name)
{
$file = $this->get_file($name);
$content = $file->read();
$data = TextHelper::unserialize($content);
return $data;
}
public function contains($id)
{
return $this->get_file($id)->exists();
}
public function store($id, $data)
{
$file = $this->get_file($id);
$data_to_write = TextHelper::serialize($data);
$file->open(File::WRITE);
$file->lock();
$file->write($data_to_write);
$file->unlock();
$file->close();
$file->change_chmod(0666);
}
public function delete($id)
{
try
{
$this->get_file($id)->delete();
}
catch(IOException $ex)
{
}
}
public function clear()
{
$cache_dir = new Folder(PATH_TO_ROOT . '/cache');
$files = $cache_dir->get_files('`^' . $this->prefix . '-.*`');
foreach ($files as $file)
{
$file->delete();
}
}
private function get_file($id)
{
if ($this->files_cache->contains($id))
{
return $this->files_cache->get($id);
}
else
{
$file = new File(PATH_TO_ROOT . '/cache/' . $this->prefix . '-' . $id);
$this->files_cache->store($id, $file);
return $file;
}
}
}
?>