public function __construct(mdb_config $config, imdb_logger $logger)
{
$this->config = $config;
$this->logger = $logger;
if (($this->config->usecache || $this->config->storecache) && !is_dir($this->config->cachedir)) {
$this->logger->critical("[Cache] Configured cache directory [{$this->config->cachedir}] does not exist!");
throw new imdb_exception("[Cache] Configured cache directory [{$this->config->cachedir}] does not exist!");
}
if ($this->config->storecache && !is_writable($this->config->cachedir)) {
$this->logger->critical("[Cache] Configured cache directory [{$this->config->cachedir}] lacks write permission!");
throw new imdb_exception("[Cache] Configured cache directory [{$this->config->cachedir}] lacks write permission!");
}
}
/**
* Check cache and purge outdated files
* This method looks for files older than the cache_expire set in the
* mdb_config and removes them
* @TODO add a limit on how frequently a purge can occur
*/
public function purge()
{
$cacheDir = $this->config->cachedir;
$this->logger->debug("[Cache] Purging old cache entries");
if (is_dir($cacheDir)) {
if (is_writable($cacheDir)) {
$thisdir = dir($cacheDir);
$now = time();
while ($file = $thisdir->read()) {
if ($file != "." && $file != "..") {
$fname = $cacheDir . $file;
if (is_dir($fname)) {
continue;
}
$mod = filemtime($fname);
if ($mod && $now - $mod > $this->config->cache_expire) {
unlink($fname);
}
}
}
} elseif (!empty($cacheDir)) {
$this->logger->critical("[Cache] Cache directory [{$cacheDir}] lacks write permission - purge aborted.");
}
} elseif (!empty($cacheDir)) {
$this->logger->critical("[Cache] Cache directory [{$cacheDir}] does not exist - purge aborted.");
}
}
