Spring Boot中怎么使用Spring Statemachine状态机实现订单状态流转控制

import org.springframework.statemachine.state.State;
import org.springframework.statemachine.transition.Transition;
 
// 定义订单状态
public enum OrderStates {
    NEW, PENDING, SHIPPED, DELIVERED
}
 
// 定义订单事件
public enum OrderEvents {
    PAY, SHIP, DELIVER
}
 
// 配置Spring StateMachine
@Configuration
@EnableStateMachine(name = "orderStateMachine")
public class OrderStateMachineConfig extends StateMachineConfigurerAdapter<OrderStates, OrderEvents> {
 
    @Override
    public void configure(StateMachineStateConfigurer<OrderStates, OrderEvents> states) throws Exception {
        states
            .withStates()
            .initial(OrderStates.NEW)
            .states(EnumSet.allOf(OrderStates.class));
    }
 
    @Override
    public void configure(StateMachineTransitionConfigurer<OrderStates, OrderEvents> transitions) throws Exception {
        transitions
            .withExternal()
            .source(OrderStates.NEW)
            .target(OrderStates.PENDING)
            .event(OrderEvents.PAY)
            .and()
            .withExternal()
            .source(OrderStates.PENDING)
            .target(OrderStates.SHIPPED)
            .event(OrderEvents.SHIP)
            .and()
            .withExternal()
            .source(OrderStates.SHIPPED)
            .target(OrderStates.DELIVERED)
            .event(OrderEvents.DELIVER);
    }
 
    @Bean
    public Action<OrderStates, OrderEvents> printAction() {
        return new Action<OrderStates, OrderEvents>() {
            @Override
            public void execute(StateContext<OrderStates, OrderEvents> context) {
                State<OrderStates, OrderEvents> state = context.getState();
                System.out.println("Current state is: " + state.getId());
            }
        };
    }
}
 
// 使用StateMachine
@Service
public class OrderStateService {
 
    @Autowired
    private StateMachine<OrderStates, OrderEvents> stateMachine;
 
    public void changeOrderState(OrderEvents event, Order order) {
        stateMachine.start();
        stateMachine.sendEvent(event);
        // 可以添加额外的逻辑来处理订单
    }
}

这个代码示例展示了如何在Spring Boot应用中使用Spring Statemachine来管理订单状态的流转。首先定义了订单的状态和事件，然后通过配置类配置状态机，并定义状态转换及其对应的动作。最后，在一个服务类中，我们可以通过发送事件来触发状态的改变。这个例子简单而直接，展示了如何将状态机引入到实际的业务流程中。