/**
* Process a request (with cache support)
*
* @param $url
* @return array|false|mixed
*/
private function process_request($url)
{
debugging("Processing request: {$url}");
// cache key
$key = urlencode($url);
// check whether the current path has been already selected:
// if the 'lastPath' is equal to 'path' then the corresponding
// cached value will be removed !!!
if (strcmp($this->requests->get(self::OMERO_LAST_QUERY_KEY), $url) === 0) {
$this->requests->delete($key);
debugging("Cleaning cache: " . "{$url} -- " . $key);
}
// store the last query URL
$this->requests->set(self::OMERO_LAST_QUERY_KEY, $url);
// check whether the request is in cache and process it otherwise
$response = $this->requests->get($key);
if (!$response) {
debugging("Getting data from the SERVER: {$url}");
$response = $this->omero->process_request($url, true, $this->access_key, $this->access_secret);
$this->requests->set($key, $response);
debugging("RESPONSE IS OBJECT: " . (is_object($response) ? "OK" : "NO"));
} else {
debugging("Getting data from the CACHE: {$url}");
}
return $response;
}
/**
* Check that this cache instance is tracking the current user.
*/
protected function check_tracked_user()
{
if (isset($_SESSION['USER']->id) && $_SESSION['USER']->id !== null) {
// Get the id of the current user.
$new = $_SESSION['USER']->id;
} else {
// No user set up yet.
$new = 0;
}
if ($new !== self::$loadeduserid) {
// The current user doesn't match the tracked userid for this request.
if (!is_null(self::$loadeduserid)) {
// Purge the data we have for the old user.
// This way we don't bloat the session.
$this->purge();
// Update the session id just in case!
$this->set_session_id();
}
self::$loadeduserid = $new;
$this->currentuserid = $new;
} else {
if ($new !== $this->currentuserid) {
// The current user matches the loaded user but not the user last used by this cache.
$this->purge_current_user();
$this->currentuserid = $new;
// Update the session id just in case!
$this->set_session_id();
}
}
}
