springboot責任鏈模式實現(xiàn)多級校驗

更新時間：2024年11月22日 10:19:41 作者：你知道煙火嗎

責任鏈模式是將鏈中的每一個節(jié)點看作是一個對象,每個節(jié)點處理的請求不同,且內部自動維護一個下一節(jié)點對象,下面我們來聊聊springboot如何利用責任鏈模式實現(xiàn)多級校驗吧

1、定義處理器接口

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class Order {

    private Integer creditScore;
    private Integer quantity;
}

public interface OrderHandler {

    boolean handle(Order order);
}

2、實現(xiàn)不同的校驗處理器

信用校驗處理器：

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

庫存校驗處理器：

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

3、責任鏈管理器

@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、服務類調用責任鏈

@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("校驗成功");
        }
        return process;
    }
}

5、測試

@SpringBootTest
public class OrderServiceTest {

    @Autowired
    private OrderService orderService;

    @Test
    public 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);
    }

}