2022-07-11-중재자패턴-2부-패턴적용하기

01.중재자패턴 적용하기

01.1 FrontDesk

import java.time.LocalDateTime;

public class FrontDesk {

    private CleaningService cleaningService = new CleaningService();

    public void getTowers(Guest guest, int numberOfTowers) {
        cleaningService.getTowers(guest.getId(), numberOfTowers);
    }

    public String getRoomNumberFor(Integer guestId) {
        return "1111";
    }

    public void dinner(Guest guest, LocalDateTime dateTime) {
        restaurant.dinner(guest.getId(), dateTime);
    }
}

• Mediater이기 때문에 college를 다 알고 있어야함
• 이거 넘길때 그냥 게스트 전체를 넘기면 안되고 , 필요한 정보만 넘겨야함

01.2 CleaningService

• before

• public class CleaningService {
      public void clean(Gym gym) {
          System.out.println("clean " + gym);
      }
  
      public void getTower(Guest guest, int numberOfTower) {
          System.out.println(numberOfTower + " towers to " + guest);
      }
  
      public void clean(Restaurant restaurant) {
          System.out.println("clean " + restaurant);
      }
  }

• after

• public class CleaningService {
  
      private FrontDesk frontDesk = new FrontDesk();
  
      public void getTowers(Integer guestId, int numberOfTowers) {
          String roomNumber = this.frontDesk.getRoomNumberFor(guestId);
          System.out.println("provide " + numberOfTowers + " to " + roomNumber);
      }
  }

• 룸넘버가 필요하면 FrontDesk에서 가져올 수 있게 선언하면됨

01.3 Guest

• before

• public class Guest {
  
      private Restaurant restaurant = new Restaurant();
  
      private CleaningService cleaningService = new CleaningService();
  
      public void dinner() {
          restaurant.dinner(this);
      }
  
      public void getTower(int numberOfTower) {
          cleaningService.getTower(this, numberOfTower);
      }
  
  }

• after

• import java.time.LocalDateTime;
  
  public class Guest {
  
      private Integer id;
  
      private FrontDesk frontDesk = new FrontDesk();
  
      public void getTowers(int numberOfTowers) {
          this.frontDesk.getTowers(this, numberOfTowers);
      }
  
      public Integer getId() {
          return id;
      }
  
      public void setId(Integer id) {
          this.id = id;
      }
  }

02.저녁을 추가하는 상황

02.1 Restaurant

import java.time.LocalDateTime;

public class Restaurant {
    public void dinner(Integer id, LocalDateTime dateTime) {

    }
}

02.2 FrontDesk

• before

• import java.time.LocalDateTime;
  
  public class FrontDesk {
  
      private CleaningService cleaningService = new CleaningService();
  
      public void getTowers(Guest guest, int numberOfTowers) {
          cleaningService.getTowers(guest.getId(), numberOfTowers);
      }
  
      public String getRoomNumberFor(Integer guestId) {
          return "1111";
      }
  }

• after

• import java.time.LocalDateTime;
  
  public class FrontDesk {
  
      private CleaningService cleaningService = new CleaningService();
  
      private Restaurant restaurant = new Restaurant();
  
      public void getTowers(Guest guest, int numberOfTowers) {
          cleaningService.getTowers(guest.getId(), numberOfTowers);
      }
  
      public String getRoomNumberFor(Integer guestId) {
          return "1111";
      }
  
      public void dinner(Guest guest, LocalDateTime dateTime) {
          restaurant.dinner(guest.getId(), dateTime);
      }
  }

02.3 Guest

• before

• import java.time.LocalDateTime;
  
  public class Guest {
  
      private Integer id;
  
      private FrontDesk frontDesk = new FrontDesk();
  
      public void getTowers(int numberOfTowers) {
          this.frontDesk.getTowers(this, numberOfTowers);
      }
  
      public Integer getId() {
          return id;
      }
  
      public void setId(Integer id) {
          this.id = id;
      }
  }

• after

• import java.time.LocalDateTime;
  
  public class Guest {
  
      private Integer id;
  
      private FrontDesk frontDesk = new FrontDesk();
  
      public void getTowers(int numberOfTowers) {
          this.frontDesk.getTowers(this, numberOfTowers);
      }
  
      private void dinner(LocalDateTime dateTime) {
          this.frontDesk.dinner(this, dateTime);
      }
  
      public Integer getId() {
          return id;
      }
  
      public void setId(Integer id) {
          this.id = id;
      }
  }