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长文多图：结合 DDD 讲清楚编写技术方案的七大维度 ​

原文 PDF：[星标]长文多图：结合DDD讲清楚编写技术方案的七大维度.pdf（已转文字 + 提取配图）

正文 ​

2022/6/12 21:46 DDD

DDD

IT JAVA 2021-10-01 16:56

8 #Java 54 # 18 #DDD 2 ​

JAVA

JAVA

java_fro nt

1

1946-1956

1956-1968

1968

https://mp.weixin.qq.com/s/cpvnyzCWduO1r9tp1Yjhsw 1/33

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2

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whywhat

how

3

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3.1

3.1.1

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3.1.2

(1)

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(2)

(3)

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(4)

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3.1.3

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3.1.4

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3.2

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include

extend

3.3

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3.3.1

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3.3.2

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3.3.3

ABCABB

CA

BCCB

3.4

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 // 
                                        16/33



        public class FootballPlayerDO {


               private Long id;

               private String name;


               private Integer height;


               private Integer weight;


               private String gamePerformance;




        }

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//

public class FootballPlayerDMO {

   private Long id;

   private String name;


   private Integer height;


   private Integer weight;


   private GamePerformanceVO gamePerformanceVO;

}

public class GamePerformanceVO {

   private Double runDistance;


   private Double passSuccess;


   private Integer scoreNum;

}

JSON

groovyQLExpress

JSONKEY5

MySQLESJSON KEY

3.5

ABCA9

9B88C

77

        public class OrderServiceImpl implements OrderService {

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             @Resource


             private OrderMapper orderMapper;




             @Override




             public void createOrder(OrderBO orderBO) {




             if (null == orderBO) {



                  throw new RuntimeException("    ");




             }




             if (OrderTypeEnum.isNotValid(orderBO.getType())) {




                  throw new RuntimeException("    ");




             }




             // A




             if (OrderTypeEnum.A_TYPE.getCode().equals(orderBO.getType())) {




                 orderBO.setPrice(orderBO.getPrice() * 0.9);




                 if (orderBO.getWeight() > 9) {




                          throw new RuntimeException("         ");




                    }




                    orderBO.setRefundSupport(Boolean.FALSE);




             }




             // B




             else if (OrderTypeEnum.B_TYPE.getCode().equals(orderBO.getType())) {




                 orderBO.setPrice(orderBO.getPrice() * 0.8);




                 if (orderBO.getWeight() > 8) {




                          throw new RuntimeException("         ");




                    }




                    orderBO.setRefundSupport(Boolean.TRUE);




             }




             // C




             else if (OrderTypeEnum.C_TYPE.getCode().equals(orderBO.getType())) {




                 orderBO.setPrice(orderBO.getPrice() * 0.7);




                 if (orderBO.getWeight() > 7) {




                          throw new RuntimeException("         ");




                    }




                    orderBO.setRefundSupport(Boolean.TRUE);




             }




             // 




             OrderDO orderDO = new OrderDO();


             BeanUtils.copyProperties(orderBO, orderDO);


             orderMapper.insert(orderDO);




   }

}

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3.5.1

 // 
                                      19/33



        public interface DiscountStrategy {

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             public void discount(OrderBO orderBO);

}

// A

@Component

public class TypeADiscountStrategy implements DiscountStrategy {

             @Override




             public void discount(OrderBO orderBO) {




             orderBO.setPrice(orderBO.getPrice() * 0.9);




   }

}

// B

@Component

public class TypeBDiscountStrategy implements DiscountStrategy {

             @Override




             public void discount(OrderBO orderBO) {




             orderBO.setPrice(orderBO.getPrice() * 0.8);




   }

}

// C

@Component

public class TypeCDiscountStrategy implements DiscountStrategy {

             @Override




             public void discount(OrderBO orderBO) {




             orderBO.setPrice(orderBO.getPrice() * 0.7);




   }

}

//

@Component

public class DiscountStrategyFactory implements InitializingBean {

   private Map<String, DiscountStrategy> strategyMap = new HashMap<>();




               @Resource
                                             20/33

               private TypeADiscountStrategy typeADiscountStrategy;


               @Resource


               private TypeBDiscountStrategy typeBDiscountStrategy;


               @Resource


               private TypeCDiscountStrategy typeCDiscountStrategy;

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             public DiscountStrategy getStrategy(String type) {


                    return strategyMap.get(type);




             }



             @Override




             public void afterPropertiesSet() throws Exception {




             strategyMap.put(OrderTypeEnum.A_TYPE.getCode(), typeADiscountStrategy);


             strategyMap.put(OrderTypeEnum.B_TYPE.getCode(), typeBDiscountStrategy);


             strategyMap.put(OrderTypeEnum.C_TYPE.getCode(), typeCDiscountStrategy);




   }

}

//

@Component

public class DiscountStrategyExecutor {

   private DiscountStrategyFactory discountStrategyFactory;




             public void discount(OrderBO orderBO) {




             DiscountStrategy discountStrategy = discountStrategyFactory.getStrategy(orderBO.ge



             if (null == discountStrategy) {




              throw new RuntimeException("               ");




             }


             discountStrategy.discount(orderBO);




   }

}

3.5.2

//

public interface CreateOrderService {

   public void createOrder(OrderBO orderBO);

}

 // 
                                                                                        21/33



        public abstract class AbstractCreateOrderFlow {

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2022/6/12 21:46 abstract class AbstractCreateOrderFlowDD{D

        public

@Resource

private OrderMapper orderMapper;

public void createOrder(OrderBO orderBO) {

//

                if (null == orderBO) {



                     throw new RuntimeException("        ");




                }




                if (OrderTypeEnum.isNotValid(orderBO.getType())) {




                     throw new RuntimeException("        ");




                }




                // 




                discount(orderBO);




                // 




                weighing(orderBO);




                // 




                supportRefund(orderBO);




                // 




   OrderDO orderDO = new OrderDO();




   BeanUtils.copyProperties(orderBO, orderDO);


   orderMapper.insert(orderDO);

}

public abstract void discount(OrderBO orderBO);

public abstract void weighing(OrderBO orderBO);

   public abstract void supportRefund(OrderBO orderBO);

}

//

@Service

public class CreateOrderFlow extends AbstractCreateOrderFlow {

@Resource

private DiscountStrategyExecutor discountStrategyExecutor;

@Resource

private ExpressStrategyExecutor expressStrategyExecutor;

@Resource

private RefundStrategyExecutor refundStrategyExecutor;

               @Override
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               public void discount(OrderBO orderBO) {

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               }  discountStrategyExecutor.discount(orderBO);

@Override

public void weighing(OrderBO orderBO) {

   expressStrategyExecutor.weighing(orderBO);

}

@Override

public void supportRefund(OrderBO orderBO) {

                  refundStrategyExecutor.supportRefund(orderBO);




   }

}

3.5.3

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Y

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3.3.1

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3.6

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 (1) api

DTO

(2) controller

HTTP

(3) service

BO

(4) domain

DMOVODO

(5) dependency

RPC

(6) infrastructure

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DMOVO

DO

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3.7

Swagger

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4

JAVA

JAVA

java_fro nt

 #8                                                           

                                               

ATAM

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MySQL

JAVA

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