我试图使用“ fork / join”结构在状态“ S2”的区域中并行执行状态机。状态机的配置基于uml model。 我对这两个区域的并行工作有疑问。 首先，状态机经过状态S20至S23，然后将状态从S30传递至S33。
问题出在哪里？ 预先感谢您的帮助。
这是我的状态机配置：
@Slf4j
@Configuration
@EnableStateMachine
public class StateMachineConfig extends StateMachineConfigurerAdapter<String, String> {
@Override
public void configure(StateMachineModelConfigurer<String, String> model) throws Exception {
model
.withModel()
.factory(modelFactory());
}
@Bean
public StateMachineModelFactory<String, String> modelFactory() {
Resource model = new ClassPathResource("/uml/simple-forkjoin.uml");
return new UmlStateMachineModelFactory(model);
}
@Override public void configure(StateMachineConfigurationConfigurer<String, String> config) throws Exception {
config
.withConfiguration()
.listener(new StateMachineListener())
.autoStartup(true);
}
}
表示状态的示例类：
@Slf4j
@WithStateMachine
public class S22 {
@OnTransition(target = "S22")
public void onTransition(StateContext<String, String> stateContext) {
log.info(Colours.ANSI_BLUE + "target = \"S22\", getState().getId(): "
+ stateContext.getStateMachine().getState().getId()
+ Colours.ANSI_RESET);
Sleep.sleep(1000);
}
@OnStateChanged(target = "S22")
public void onStateChanged(StateContext<String, String> stateContext) {
log.debug(Colours.B_HI_ANSI_GREEN + "S22 EXPECTS_ORDERS stateChanged :: Current state ID :: {}",
stateContext.getStateMachine().getState().getId() + Colours.ANSI_RESET);
Sleep.sleep(1000);
}
}
日志：
2019-03-21 12:25:01.746 INFO 7648 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 8 ms
2019-03-21 12:25:01.780 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S0
2019-03-21 12:25:01.788 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S0 : target = "S0, getState().getId(): SI
2019-03-21 12:25:01.791 DEBUG 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S0 : S0 EXPECTS_ORDERS stateChanged :: Current state ID :: S0
2019-03-21 12:25:01.791 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : state changed from: SI to S0
2019-03-21 12:25:01.791 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S1
2019-03-21 12:25:01.792 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S1 : target = "S1", getState().getId(): S0
2019-03-21 12:25:01.794 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S21
2019-03-21 12:25:01.794 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S21 : target = "S21", getState().getId(): S2
2019-03-21 12:25:02.795 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S22
2019-03-21 12:25:02.797 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S22 : target = "S22", getState().getId(): S2
2019-03-21 12:25:03.799 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S23
2019-03-21 12:25:03.801 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S23 : target = "S23", getState().getId(): S2
2019-03-21 12:25:04.803 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : state changed from: S22 to S23
2019-03-21 12:25:04.803 INFO 7648 --- [nio-8080-exec-2] o.s.s.support.LifecycleObjectSupport : started org.springframework.statemachine.support.DefaultStateMachineExecutor@76b2b847
2019-03-21 12:25:04.803 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : State machine started :: S2
2019-03-21 12:25:04.804 INFO 7648 --- [nio-8080-exec-2] o.s.s.support.LifecycleObjectSupport : started S23 S22 S20 S21 / S23 / uuid=51391415-d1f5-440f-9c8e-677c00bcdd50 / id=null
2019-03-21 12:25:04.805 DEBUG 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S22 : S22 EXPECTS_ORDERS stateChanged :: Current state ID :: S2
2019-03-21 12:25:05.806 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : state changed from: S21 to S22
2019-03-21 12:25:05.806 DEBUG 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S21 : S21 EXPECTS_ORDERS stateChanged :: Current state ID :: S2
2019-03-21 12:25:06.807 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : state changed from: S20 to S21
2019-03-21 12:25:06.808 DEBUG 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S20 : S20 EXPECTS_ORDERS stateChanged :: Current state ID :: S2
2019-03-21 12:25:07.809 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : state changed from: null to S20
2019-03-21 12:25:07.809 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S31
2019-03-21 12:25:07.810 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S31 : target = "S31", getState().getId(): S2
2019-03-21 12:25:08.211 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S32
2019-03-21 12:25:08.212 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S32 : target = "S32", getState().getId(): S2
2019-03-21 12:25:08.613 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S33
2019-03-21 12:25:08.614 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S33 : target = "S33", getState().getId(): S2
2019-03-21 12:25:09.015 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S3
2019-03-21 12:25:09.016 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S3 : target = "S3", getState().getId(): S2
2019-03-21 12:25:09.016 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : transition started! target state: S3
2019-03-21 12:25:09.017 INFO 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S3 : target = "S3", getState().getId(): S2
2019-03-21 12:25:09.018 INFO 7648 --- [nio-8080-exec-2] o.s.s.support.LifecycleObjectSupport : stopped org.springframework.statemachine.support.DefaultStateMachineExecutor@76b2b847
2019-03-21 12:25:09.018 INFO 7648 --- [nio-8080-exec-2] o.s.s.support.LifecycleObjectSupport : stopped S23 S22 S20 S21 / / uuid=51391415-d1f5-440f-9c8e-677c00bcdd50 / id=null
2019-03-21 12:25:09.019 DEBUG 7648 --- [nio-8080-exec-2] com.fj.forkJointest.forkJoin.S4 : S4 EXPECTS_ORDERS stateChanged :: Current state ID :: S4
2019-03-21 12:25:09.020 INFO 7648 --- [nio-8080-exec-2] c.f.f.config.StateMachineListener : state changed from: S2 to S4
答案 0 :(得分：0)
Spring State Machine使用TaskExecutor来执行区域，默认情况下它是同步的。要实现异步执行，您需要覆盖默认的任务执行器。
您可以通过以下几种方式进行操作：
使用StateMachineConfigurationConfigurer：
@Override
public void configure(StateMachineConfigurationConfigurer<States, Events> config) throws Exception {
config
.withConfiguration()
//other configs
.taskExecutor(myAsyncTaskExecutor())
}
public TaskExecutor myAsyncTaskExecutor() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
return taskExecutor;
}
或者只是声明一个bean，它将从SM中自动选择：
@Bean(name = StateMachineSystemConstants.TASK_EXECUTOR_BEAN_NAME)
public TaskExecutor taskExecutor() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
return taskExecutor;
}
答案 1 :(得分：0)
执行器需要定义如下
public TaskExecutor myAsyncTaskExecutor() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
taskExecutor.initialize();
return taskExecutor;
}
状态机配置
.taskExecutor(myAsyncTaskExecutor()).taskScheduler(new ConcurrentTaskScheduler())