springboot：责任链模式实现多级校验

server/2024/11/23 18:14:46/

责任链模式是将链中的每一个节点看作是一个对象，每个节点处理的请求不同，且内部自动维护一个下一节点对象。
当一个请求从链式的首段发出时，会沿着链的路径依此传递给每一个节点对象，直至有对象处理这个请求为止。
属于行为型模式。

1、定义处理器接口

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class Order {private Integer creditScore;private Integer quantity;
}

public interface OrderHandler {boolean handle(Order order);
}

2、实现不同的校验处理器
信用校验处理器：

@Component
public class CreditHandler implements OrderHandler{@Overridepublic boolean handle(Order order) {if (order.getCreditScore() % 2 != 0){System.out.println("信用不足");return false;}return true;}
}

库存校验处理器：

@Component
public class StockHandler implements OrderHandler{@Overridepublic boolean handle(Order order) {if (order.getQuantity() > 20){System.out.println("库存不足");return false;}return true;}
}

3、责任链管理器

@Component
public class OrderHandlerChain {private final List<OrderHandler> handlers;public OrderHandlerChain(List<OrderHandler> handlers){this.handlers = handlers;}public boolean process(Order order){for (OrderHandler handler : handlers) {if (!handler.handle(order)){return false;}}return true;}
}

4、服务类调用责任链

@Component
public class OrderService {private final OrderHandlerChain handlerChain;private OrderService(OrderHandlerChain handlerChain){this.handlerChain = handlerChain;}public boolean processOrder(Order order){boolean process = handlerChain.process(order);if (process){System.out.println("校验成功");}return process;}
}

5、测试

@SpringBootTest
public class OrderServiceTest {@Autowiredprivate OrderService orderService;@Testpublic void testOrderProcess(){Order order = new Order(2, 5);orderService.processOrder(order);Order order1 = new Order(2, 5);orderService.processOrder(order1);Order order2 = new Order(2, 21);orderService.processOrder(order2);}}