/**
* TempestCache::tempestChanged($incoming) to check if incoming data array matches cache
*
* @param array[] $incoming Array structure of current dataset that needs to be compared to the cache.
*
* @return boolean True if datasets are different or timestamp is not within in the hour. Cache resets every hour.
* returns false if incoming data set is the same as cache.
*/
static function tempestChanged($incoming)
{
if (NULL == self::$instance) {
self::$instance = new TempestCache();
if (!file_exists(self::$tempest)) {
self::setCache($incoming);
return true;
} else {
$fp = fopen(self::$tempest, 'r');
self::$cache = json_decode(fgets($fp));
fclose($fp);
}
}
//Write cache and return true when current cache is empty or timestamp are different hour or incoming data set is different than cache
if (empty(self::$cache) || !self::checkTimeStamp($incoming) || !self::checkDataSet($incoming)) {
self::setCache($incoming);
return true;
}
return false;
}
