/**
* 静态方法, 单例统一访问入口
* @return object 返回对象的唯一实例
*/
public static function getInstance()
{
if (is_null(self::$_instance) || !isset(self::$_instance)) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* 判断是否向db读取数据
* 返回值为true表示从db中获得，否则从cache中获得
* @param int $deviceId
* @return boolean
*/
public function check2Db($userId, $deviceId, $eventId)
{
$cacheUserId = $this->get($this->getUserKey($userId));
$cacheEventId = $this->get($this->getDeviceEventKey($deviceId));
if ($cacheUserId == false || $cacheEventId == false) {
//当3者之一都不存在记录，
return true;
}
$userMaxId = MiniEvent2::getInstance()->getMaxIdByUser2($userId);
if ($cacheUserId != $userMaxId || $cacheEventId != $eventId) {
return true;
}
return false;
}