spring状态机

<dependency> <groupId>org.springframework.statemachine</groupId>

    <artifactId>spring-statemachine-core</artifactId>

    <version>2.3.0.RELEASE</version> 

</dependency>

 

public enum States {

    INITIAL, STATE1, STATE2, FINAL

}

public enum Events {

    EVENT1, EVENT2

}

 

@Configuration

@EnableStateMachine

public class StateMachineConfig extends EnumStateMachineConfigurerAdapter<States, Events> {

    @Override

    public void configure(StateMachineStateConfigurer<States, Events> states) throws Exception {

        states

            .withStates()

                .initial(States.INITIAL)

                .states(EnumSet.allOf(States.class));

    }

    @Override

    public void configure(StateMachineTransitionConfigurer<States, Events> transitions) throws Exception {

        transitions

            .withExternal()

                .source(States.INITIAL).target(States.STATE1).event(Events.EVENT1)

                .and()

            .withExternal()

                .source(States.STATE1).target(States.STATE2).event(Events.EVENT2)

                .and()

            .withExternal()

                .source(States.STATE2).target(States.FINAL);

    }

}

 

@Service

public class StateMachineService {

    @Autowired

    private StateMachine<States, Events> stateMachine;

    public void execute() {

        stateMachine.start();

        stateMachine.sendEvent(Events.EVENT1);

        stateMachine.sendEvent(Events.EVENT2);

        stateMachine.stop();

    }

}