Event和EventBus简单Demo示例：

/**
 * @author marui116
 * @version 1.0.0
 * @className TransNeedAssignCarrierEvent
 * @description TODO
* @date 2023/3/28 11:08
 */
@Component
@EventAnnonation(event = TransNeedEventEnum.Assign_Carrier_Event)
@Slf4j
public class TransNeedAssignCarrierEvent implements EventComponent {

    @Override
    public void invokeEvent(Context context) {
        log.info("分配了服务商，给服务商发邮件和短信，让服务商安排");
    }
}

/**
 * @author marui116
 * @version 1.0.0
 * @className TransNeedAssignCarEvent
 * @description TODO
* @date 2023/3/28 11:05
 */
@Component
@EventAnnonation(event = TransNeedEventEnum.Assign_Car_Event)
@Slf4j
public class TransNeedAssignCarEvent implements EventComponent {
    @Override
    public void invokeEvent(Context context) {
        log.info("分配了车辆信息，给运单中心发送车辆信息");
    }
}

/**
 * @author marui116
 * @version 1.0.0
 * @className EventServiceImpl
 * @description TODO
* @date 2023/3/28 10:57
 */
@Service
public class EventBusServiceImpl implements EventBusService {
    @Resource
    private ApplicationContextUtil applicationContextUtil;

    private Map<TransNeedEventEnum, EventComponent> eventComponentMap = new ConcurrentHashMap<>();

    @PostConstruct
    private void init() {
        ApplicationContext context = applicationContextUtil.getApplicationContext();
        Map<String, EventComponent> eventBeanMap = context.getBeansOfType(EventComponent.class);
        eventBeanMap.values().forEach(event -> {
            if (event.getClass().isAnnotationPresent(EventAnnonation.class)) {
                EventAnnonation eventAnnonation = event.getClass().getAnnotation(EventAnnonation.class);
                eventComponentMap.put(eventAnnonation.event(), event);
            }
        });
    }

    @Override
    public void invokeEvent(TransNeedEventEnum eventEnum, Context context) {
        if (eventComponentMap.containsKey(eventEnum)) {
            eventComponentMap.get(eventEnum).invokeEvent(context);
        }
    }
}

4.2.3 状态机上下文

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Context {
    private String userName;
    private Long transNeedId;
    private TransNeed transNeed;
}

4.2.4 状态枚举

public enum TransNeedStatusEnum {
    /**
     * 开始状态
     */
    None,
    /**
     * 待分配陆运服务商
     */
    UN_ASSIGN_CARRIER,
    /**
     * 待分配车辆和司机
     */
    UN_ASSIGN_CAR,
    /**
     * 订单已处理，已安排司机提货
     */
    ASSIGNED_CAR,
    /**
     * 已完成提货
     */
    PICKUPED,
    /**
     * 运输中
     */
    IN_TRANSIT,
    /**
     * 已通过内地海关
     */
    PASS_CUSTOMS,
    /**
     * 您的货物部分妥投部分投递失败
     */
    PARTIAL_DELIVERIED,
    /**
     * 您的货物妥投
     */
    ALL_DELIVERIED,
    /**
     * 您的货物被拒收
     */
    ALL_REJECTED,
    /**
     * 委托订单被取消
     */
    CANCELED,
    /**
     * 单据结束归档
     */
    FINISH;

}

4.2.5 事件枚举