/**
* Get the latest version (update) information, either from the cache or
* from the update server.
*
* @param $force bool Set to true to force fetching fresh data from the server
*
* @return stdClass The update information, in object format
*/
public function getUpdateInformation($force = false)
{
// Get the Live Update configuration
$config = LiveUpdateConfig::getInstance();
// Get an instance of the storage class
$storageOptions = $config->getStorageAdapterPreferences();
require_once dirname(__FILE__) . '/storage/storage.php';
$this->storage = LiveUpdateStorage::getInstance($storageOptions['adapter'], $storageOptions['config']);
$storage = $this->storage;
// If we are requested to forcibly reload the information, clear old data first
if ($force) {
$this->storage->set('lastcheck', 0);
$this->storage->set('updatedata', '');
$this->storage->save();
$registry = $storage->getRegistry();
$registry->set('update.lastcheck', null);
$registry->set('update.updatedata', null);
$storage->setRegistry($registry);
}
// Fetch information from the cache
$registry = $storage->getRegistry();
$lastCheck = $registry->get('lastcheck', 0);
$cachedData = $registry->get('updatedata', null);
if (is_string($cachedData)) {
$cachedData = trim($cachedData, '"');
$cachedData = json_decode($cachedData);
}
if (empty($cachedData)) {
$lastCheck = 0;
}
// Check if the cache is at most $cacheTTL hours old
$now = time();
$maxDifference = $this->cacheTTL * 3600;
$difference = abs($now - $lastCheck);
if (!$force && $difference <= $maxDifference) {
// The cache is fresh enough; return cached data
return $cachedData;
} else {
// The cache is stale; fetch new data, cache it and return it to the caller
$data = $this->getUpdateData($force);
$this->storage->set('lastcheck', $now);
$this->storage->set('updatedata', json_encode($data));
$this->storage->save();
return $data;
}
}
public function setRegistry($registry)
{
self::$registry = $registry;
}
