30. Monitoring State Machine

StateMachineMonitor可用于获取有关转换和操作执行时间的更多信息。 下面你可以看到这个接口是如何实现的。

public class TestStateMachineMonitor extends AbstractStateMachineMonitor<String, String> {

    @Override
    public void transition(StateMachine<String, String> stateMachine, Transition<String, String> transition, long duration) {
    }

    @Override
    public void action(StateMachine<String, String> stateMachine, Action<String, String> action, long duration) {
    }
}

一旦你有StateMachineMonitor的实现，它可以通过配置添加到状态机中，如下所示。

@Configuration
@EnableStateMachine
public class Config1 extends StateMachineConfigurerAdapter<String, String> {

    @Override
    public void configure(StateMachineConfigurationConfigurer<String, String> config)
            throws Exception {
        config
            .withMonitoring()
                .monitor(stateMachineMonitor());
    }

    @Override
    public void configure(StateMachineStateConfigurer<String, String> states) throws Exception {
        states
            .withStates()
                .initial("S1")
                .state("S2");
    }

    @Override
    public void configure(StateMachineTransitionConfigurer<String, String> transitions) throws Exception {
        transitions
            .withExternal()
                .source("S1")
                .target("S2")
                .event("E1");
    }

    @Bean
    public StateMachineMonitor<String, String> stateMachineMonitor() {
        return new TestStateMachineMonitor();
    }
}

检查示例第52章，监视以了解详细用法