checkHasCache method
Implementation
bool checkHasCache(String adId){
var bean = _resultMap[adId];
if(null!=bean){
var expired = (DateTime.now().millisecondsSinceEpoch-bean.loadTime)>bean.adBean.expireTime*1000;
if(expired){
deleteCache(bean.adBean.adId);
return false;
}
return true;
}
return false;
}