预定类面向对象设计

management RESTAURANT

CORE OBJECT

CASES

•Restaurant
-Findtable
-TakeOrder
-Checkout

•Mangement类常见usecase
Reserve:
Serve:
Checkout:

USE CASE

Usecase:Findtable

Restaurantfindanavailabletable,anchangethetabletobe
unavailable

Takeorder

-Restauranttakesanorder

Checkout

-Restaurantchecksoutatable/order,markthetableavailableagain
-Calculateorderprice

-Singleresponsibility principle
-ForceTable– Ordermapping
-Sharetableusecase

•How tomarkatableavailable?

-桌子大小不同？
Party && Table->Capacity
Findtablebasedoncapacity

Restaurant reservation system

-考虑预定的东西
例子：机票
机舱/座位号/…
•Usecase
-Search
-Select
-Cancel

Searchcriteria->Search()->List<Result>->Select()->Receipt

•Searchcriteria

•List
-当选择的时间段可以/不行时，系统应该给出什么反馈？

-可以预定：直接进入Confirm阶段
-不能预定：Throw exception/ Show message
-Design:PairfindTableForReservation(Timeslot)
throwsNoTableForReservationException
-Design:voidconfirmReservation(Pairreservation)
-为什么我们可以跳过List这个步骤？
因为Table是一样的，用户不用选择也不会知道是订1号桌还是2号桌

-How to know if a table is open for reservation for a timeslot?

如何知道对于一张Table:

Any reservationduring Timeslot – MAX_DINETIMEtoTimeslot +MAX_DINETIME?
Solution1:
每张Table按时间排序保留一个List,对于每一个进来query的timeslot,都检查是否有
符合上述区间的timeslot已经被预定了
Solution2:
保存一个Centralized的Map,有被confirm过的timeslot就插入这个Map.
Map>
当query一个新的timeslot的时候，检查这个区间内已经被预定过的Table,
排除之后剩下的就是可选的桌子，随意选一张即可
•分析各自的优缺点：
Solution1:Reservation的信息集中在Table里，不方便统一管理
e.g.清理今日的所有reservation
Solution2:如果Timeslot可以分得很细 (每五分钟一个timeslot)，
MAX_DINETIME假如为2小时，那么需要查24个entry

Cancel reservation

•Restauranttakesacancelreservationrequest,andaskthetableto
freethattimeslot.

Hotel reservation system

Core object

USE CASE

Hotel:
-Search for available rooms
-Make reservation
-Cancel reservation

Search for available rooms

1:Based on search criteria

2:Go through rooms to check availability

3:list available room types and available count

Make reservation

1:Add Room Type and number of rooms in a request

2:Send request to Hotel

3:If there is enough room left, confirm the reservation

4:If there isn’t enough room left, throw exception

CHANLLENGE:

Cancel reservation

1:Hotelsystemtakesareservation,andcancelit.

FINAL VIEW

Booking system

What

SearchcriteriaA
List
SearchcriteriaB
List
Receipt

Clarify

用Start Date,EndDate,Groupsize,City

How

Search()
Select()
Search()
Select()
-在同样的City就能放进List里
-Hotel在List里的顺序不重要

core object

use cases

•BookingSystem
-Searchforhotels
-Makereservation
-Cancelreservation

class

•Search for hotels

-Based on request(startdate+end date+city +groupsize)

-Check for all hotels in this city

-For such hotels, if this is enough capacity for group size during dates

-List all hotels that satisfy above criteria

•Make reservation

-Pickahotel
-Send reservationrequestto thathotel

•Cancel reservation

-Cancel reservation for a hotel

challenge

•Can you add payment in your system?

-Need to get price for each reservation

-Need to take a payment method

Strategy Pattern