java - Spring状态机注释@WithStateMachine不起作用

Question

我只是在使用spring状态机@WithStateMachine时遇到了一个问题。

@WithStateMachine 仅在我在 @EnableStateMachine 注释的类中定义的内部类上使用它时才起作用，但是当我在其他地方定义类时，它似乎不起作用。这是我的代码：

@Configuration@EnableStateMachine public class StateMachineConfig extends EnumStateMachineConfigurerAdapter<States, Events> {
@Override
public void configure(StateMachineStateConfigurer<States, Events> states)
    throws Exception {
    states
        .withStates()
        .initial(States.UNPAID)
        .states(EnumSet.allOf(States.class));
}

@Override
public void configure(StateMachineTransitionConfigurer<States, Events> transitions)
    throws Exception {
    transitions
        .withExternal()
        .source(States.UNPAID).target(States.WAITING_FOR_RECEIVE)
        .event(Events.PAY)
        .and()
        .withExternal()
        .source(States.WAITING_FOR_RECEIVE).target(States.DONE)
        .event(Events.RECEIVE);
}

@Override
public void configure(StateMachineConfigurationConfigurer<States, Events> config)
    throws Exception {
    config
        .withConfiguration()
        .autoStartup(true);
}

@WithStateMachine
public class Action {
    private Logger logger = LoggerFactory.getLogger(getClass());

    @OnTransition(target = "UNPAID")
    public void create() {
        logger.info("UNPAID");
    }

    @OnTransition(source = "UNPAID", target = "WAITING_FOR_RECEIVE")
    public void pay() {
        logger.info("WAITING_FOR_RECEIVE");
    }

    @OnTransition(source = "WAITING_FOR_RECEIVE", target = "DONE")
    public void receive() {
        logger.info("DONE");
    }
}}

但是当我在另一个类文件中定义 Action 时，它不起作用

我的绒球

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-messaging</artifactId>
            <version>1.2.3.RELEASE</version>
        </dependency><dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.3.RELEASE</version>
        </dependency>

Answer 1

@WithStateMachine是具有 spring 的元注释@Component。检查您的Action类是组件扫描还是手动创建为@Bean.

然后它存在于应用程序上下文中，状态机可以找到它。