Crawler
+interval: int+url: string
+getInformation(string url):string+re(string):list+permutation(list):list
swap
+ CounterParty: int+ BuyOrSell: enum(buy or sell)+ FixedPrice: int+ Quantity: int+ FloatingQuoteCode: string+Period:
+check(void):vector
future
+price: int+ lots：int+period: string
User
+ id:int+ name:string- password:string
trade
+Base Future Contract: enum(BRT or WTI)+Settlement Code: string
+ getSettlementCode(string SettlementCode):void+ check():virtual+ CheckIntegrity() :bool
trader
+ ApplyTrade(void):
manager
+ViewLog(void):log+DeleteLog(log):+ChangeUserInfo:+SendUserEmail:+useCrawler:
Analysis
+checkPeriod(string):bool-getTradeInformation(void)+divideByDate(void)+search(string period): //查询数据库中的石油信息+computeRisk(void)
use interface of crawler
