Question

我在相当复杂的场景中使用过Spring状态机。我将用SM中最简单的部分解释我的问题。参见下图。这是我的主要状态机

状态以红点圈出到下一个子机器

所以，正如你所看到的，我有3个动作。 sendBasicTemplate，timeoutLogAction和processBasicTemplateReply。我将在下面提供相关的代码段和我的配置。

我在此过程中观察到的是工厂创建的状态机始终驻留在内存中。有一些我无法想到的参考。难道SM不会停止或是否有任何我做错的事情？这是我的代码。

配置类

@Configuration @EnableStateMachineFactory public class CambodiaStateMachine extends StateMachineConfigurerAdapter<String, String> {

    @Override
    public void configure(StateMachineModelConfigurer<String, String> model) throws Exception {
        model           
            .withModel()
                .factory(modelFactory());
    }

    @Override   public void configure(StateMachineConfigurationConfigurer<String, String> config) throws Exception {
        config
            .withConfiguration()
            .machineId("cambodia")
            .autoStartup(true)
            .listener(listener());  }    

    @Bean
    public StateMachineListener<String, String> listener() {
        return new StateMachineListenerAdapter<String, String>() {
            @Override
            public void stateChanged(State<String, String> from, State<String, String> to) {
                System.out.println("State change to " + to.getId());
            }
        };
    }

    @Bean
    public StateMachineModelFactory<String, String> modelFactory() {
        return new UmlStateMachineModelFactory("classpath:stm/model.uml");
    }
}

方法：1。这是我的事件被送到机器的方式以及新SM实例的制作地点。我从队列中取出我的事件

@RabbitListener(bindings = @QueueBinding(value = @Queue(value = "sims.events.mq", durable = "true"), exchange = @Exchange(type = ExchangeTypes.TOPIC, value = "sims.events.mq.xch", ignoreDeclarationExceptions = "true", durable = "true"), key = "events"))
    public void process(GenericMessage<String> message) {

        try {

            String imei = (String) message.getHeaders().get("imei");
            Subscriber subscriber = subscriberService.findSubscriber(imei);


            // quickly create 'new' state machine
            StateMachine<String, String> stateMachine = factory.getStateMachine();

            stateMachine.addStateListener(new CompositeStateMachineListener<String, String>() {

                @Override
                public void stateContext(StateContext<String, String> arg0) {

                    String user = (String) arg0.getExtendedState().getVariables().get("imei");
                    if (user == null) {
                        return;
                    }

                    log.info(arg0.getStage().toString() + "**********" + stateMachine.getState());
                    try {
                        redisStateMachinePersister.persist(arg0.getStateMachine(), "testprefixSw:" + user);
                    } catch (Exception e) {
                        log.error(e.getMessage(), e);
                    }
                }

            });

            // restore from persistent
            String user = (String) message.getHeaders().get("imei");
            log.info(user);

            // attempt restoring only if key is exist
            if (redisTemplate.hasKey("testprefixSw:" + user)) {
                System.out.println("************************  prefix exists...restoring");
                resetStateMachineFromStore(stateMachine, user);
            } else {
                stateMachine.start();
                System.out.println("************************  No prefix");

            }

            log.info("Payload == > " + message.getPayload());

            try {
                stateMachine.getExtendedState().getVariables().put("imei", user);
                stateMachine.getExtendedState().getVariables().put("fromState", stateMachine.getState().getId());
                stateMachine.getExtendedState().getVariables().put("eventName", message.getPayload());
                if(null!= message.getHeaders().get("templates"))
                    stateMachine.getExtendedState().getVariables().put("templates", message.getHeaders().get("templates"));

                if(null!= message.getHeaders().get("ttl"))
                    stateMachine.getExtendedState().getVariables().put("ttl", message.getHeaders().get("ttl"));
            } catch (Exception e) {
                log.error(e.getMessage(), e);
            }

            // check if state is properly restored...
            log.info("Current State " + stateMachine.getState().toString());

            feedMachine(stateMachine, user, message);

            log.info("handler exited");

        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
        // TODO: save persistant state..
    }


private void feedMachine(StateMachine<String, String> stateMachine, String user, GenericMessage<String> event)
        throws Exception {
    stateMachine.sendEvent(event);
    System.out.println("persist machine --- > state :" + stateMachine.getState().toString());
    redisStateMachinePersister.persist(stateMachine, "testprefixSw:" + user);
}

private StateMachine<String, String> resetStateMachineFromStore(StateMachine<String, String> stateMachine,
        String user) throws Exception {

    StateMachine<String, String> machine = redisStateMachinePersister.restore(stateMachine, "testprefixSw:" + user);
    System.out.println("restore machine --- > state :" + machine.getState().toString());
    return machine;
}

操作

@Bean
    public Action<String, String> sendBasicTemplate() {

        // Action handler...
        return new Action<String, String>() {
            @Override
            public void execute(StateContext<String, String> context) {
                // MP: variables are the right way to do
                String imeiNo = (String) context.getExtendedState().getVariables().get("imei");
                String template = (String) context.getMessageHeader("template");

                log.info("sending basic template " + template + " to " + imeiNo);

                findTemplateNSend(context, template, imeiNo);
                xbossBalanceCheck(context, imeiNo, "Direct Query");
                setRiskyState(context, "testprefixSw:RISKY_StateBasic_WFT_Timeout" + imeiNo, 0);
            }
        };
    }

    @Bean
    public Action<String, String> processBasicTemplateReply() {

        // Action handler...
        return new Action<String, String>() {
            @Override
            public void execute(StateContext<String, String> context) {

                log.info("Result for basic template processing started");
                log.info(context.getStateMachine().getState().getIds().toString());
                String imeiNo = (String) context.getExtendedState().getVariables().get("imei");

                saveDirectValues(context, imeiNo);

                String fromState = (String) context.getExtendedState().getVariables().get("fromState");
                String eventName = (String) context.getExtendedState().getVariables().get("eventName");
                long trId = (Long) context.getMessageHeader("processId") != null? (Long) context.getMessageHeader("processId") : 0;


                String key = "testprefixSw:RISKY_StateBasic_WFT_Timeout" + imeiNo;
                log.info("*Going to delete if exists key ==>" + key);

                if (clearRiskyStateIfSet(context, key)) {
                    log.info("------------------------------Jedis Exists");
                    sendSubscriberEventLog(imeiNo, fromState, context.getStateMachine().getState().getId(), trId, eventName, false, "Query Event Success");
                }

                // mark as success sent
                context.getStateMachine().sendEvent("SEQUENCE_COMPLETE");
            }
        };
    }


@Bean
    public Action<String, String> timeoutLogAction() {
        // Action handler...
        return new Action<String, String>() {
            @Override
            public void execute(StateContext<String, String> context) {
                // log.info("timeout log Action");

                String imeiNo = (String) context.getStateMachine().getExtendedState().getVariables().get("imei");

                // String imeiNo = (String)
                // context.getExtendedState().getVariables().get("imei");
                String fromState = (String) context.getExtendedState().getVariables().get("fromState");
                String eventName = (String) context.getExtendedState().getVariables().get("eventName");
                long trId = (Long) context.getMessageHeader("processId") != null ? (Long) context.getMessageHeader("processId") : 0;


                String key = "testprefixSw:RISKY_StateBasic_WFT_Timeout" + imeiNo;
                log.info("*Going to delete if exists key ==>" + key);

                if (clearRiskyStateIfSet(context, key)) {
                    log.info("------------------------------Jedis Exists at timeout. Event Failed");
                    sendSubscriberEventLog(imeiNo, fromState, context.getStateMachine().getId(), trId, eventName, true, "Direct Query Failed due to Timeout");
                    sendAlert(imeiNo, EventPriority.NORMAL, "Direct Query Failed due to Timeout");
                }

            }
        };
    }

基于以上所述，是否有任何我缺失的东西，以便创建的状态机不被垃圾收集？或任何其他解释为什么每个请求都消耗了内存，它永远不会被释放？

Spring Statemachine Factory - 记忆中的一个

0 个答案: