Spring 如何在复合触发器上设置覆盖？

我有一个Spring集成应用程序，它通常每天使用cron触发器通过SFTP轮询一个文件。但是如果它没有找到它期望的文件，它应该通过周期性触发器每隔x分钟轮询一次，直到y尝试。为此，我使用以下组件：

@Component
public class RetryCompoundTriggerAdvice extends AbstractMessageSourceAdvice {

    private final static Logger logger = LoggerFactory.getLogger(RetryCompoundTriggerAdvice.class);

    private final CompoundTrigger compoundTrigger;

    private final Trigger override;

    private final ApplicationProperties applicationProperties;

    private final Mail mail;

    private int attempts = 0;

    public RetryCompoundTriggerAdvice(CompoundTrigger compoundTrigger, 
            @Qualifier("secondaryTrigger") Trigger override, 
            ApplicationProperties applicationProperties,
            Mail mail) {
        this.compoundTrigger = compoundTrigger;
        this.override = override;
        this.applicationProperties = applicationProperties;
        this.mail = mail;
    }

    @Override
    public boolean beforeReceive(MessageSource<?> source) {
        return true;
    }

    @Override
    public Message<?> afterReceive(Message<?> result, MessageSource<?> source) {
        final int  maxOverrideAttempts = applicationProperties.getMaxFileRetry();
        attempts++;
        if (result == null && attempts < maxOverrideAttempts) {
            logger.info("Unable to find load file after " + attempts + " attempt(s). Will reattempt");
            this.compoundTrigger.setOverride(this.override);
        } else if (result == null && attempts >= maxOverrideAttempts) {
            mail.sendAdminsEmail("Missing File");
            attempts = 0;
            this.compoundTrigger.setOverride(null);
        }
        else {
            attempts = 0;
            this.compoundTrigger.setOverride(null);
            logger.info("Found load file");
        }
        return result;
    }

    public void setOverrideTrigger() {
        this.compoundTrigger.setOverride(this.override);
    }

    public CompoundTrigger getCompoundTrigger() {
        return compoundTrigger;
    }
}

会话工厂是：

@Bean
public SessionFactory<LsEntry> sftpSessionFactory() {
    DefaultSftpSessionFactory sftpSessionFactory = new DefaultSftpSessionFactory();
    sftpSessionFactory.setHost(applicationProperties.getSftpHost());
    sftpSessionFactory.setPort(applicationProperties.getSftpPort());
    sftpSessionFactory.setUser(applicationProperties.getSftpUser());
    sftpSessionFactory.setPassword(applicationProperties.getSftpPassword());
    sftpSessionFactory.setAllowUnknownKeys(true);
    return new CachingSessionFactory<LsEntry>(sftpSessionFactory);
}

更新

下面是消息处理程序：

@Bean
@ServiceActivator(inputChannel = "sftpChannel")
public MessageHandler dailyHandler(SimpleJobLauncher jobLauncher, Job job, Mail mail) {
    JobRunner jobRunner = new JobRunner(jobLauncher, job, store, mail);
    jobRunner.setDaily("true");
    jobRunner.setOverwrite("false");
    return jobRunner;
}

---

JobRunner

启动Spring批处理作业。处理完作业后，我的应用程序会查看该文件是否包含当天所需的数据。如果没有，则设置覆盖触发器。

这就是触发器的工作方式-只有在触发器触发时，您才有机会更改触发器

由于重置为cron触发器，因此下一个更改机会是触发该触发器时（如果轮询器线程在更改触发器之前被下游流释放）

您是否正在将文件移交给另一个线程（队列通道或执行器）？如果没有，我希望应该应用对触发器的任何更改，因为在下游流返回之前不会调用

nextExecutionTime（）

---

如果有线程切换，您没有机会更改触发器。

谢谢。是的，这和我能说的不同。这就解释了。在OP更新部分添加了相关代码。不知道如何在不调用决定从

RetryCompoundTriggerAdvice

中重试的逻辑的情况下实现我的目标。不过，逻辑是基于几个因素的，包括读取和比较文件中的所有行（这就是为什么我在Spring批处理作业完成后应用它的原因）。

CompoundTriggerAdvice

提供了一些功能。一种可能性是，在处理消息时，在评估文件状态之前，将短期轮询器保持在原位。让服务“确认”该建议一切正常，并在下次投票时更改触发器。处理文件时（确认之前），使用

beforeceive（）

return

false

，取消当前轮询

@Bean
@InboundChannelAdapter(autoStartup="true", channel = "sftpChannel", poller = @Poller("pollerMetadata"))
public SftpInboundFileSynchronizingMessageSource sftpMessageSource() {
    SftpInboundFileSynchronizingMessageSource source =
            new SftpInboundFileSynchronizingMessageSource(sftpInboundFileSynchronizer());
    source.setLocalDirectory(applicationProperties.getScheduledLoadDirectory());
    source.setAutoCreateLocalDirectory(true);
    CompositeFileListFilter<File> compositeFileFilter = new CompositeFileListFilter<File>();
    compositeFileFilter.addFilter(new LastModifiedFileListFilter());
    compositeFileFilter.addFilter(new FileSystemPersistentAcceptOnceFileListFilter(store, "dailyfilesystem"));
    source.setLocalFilter(compositeFileFilter);
    source.setCountsEnabled(true);
    return source;
}

@Bean
public PollerMetadata pollerMetadata(RetryCompoundTriggerAdvice retryCompoundTriggerAdvice) {
    PollerMetadata pollerMetadata = new PollerMetadata();
    List<Advice> adviceChain = new ArrayList<Advice>();
    adviceChain.add(retryCompoundTriggerAdvice);
    pollerMetadata.setAdviceChain(adviceChain);
    pollerMetadata.setTrigger(compoundTrigger());
    pollerMetadata.setMaxMessagesPerPoll(1);
    return pollerMetadata;
}

@Bean
public CompoundTrigger compoundTrigger() {
    CompoundTrigger compoundTrigger = new CompoundTrigger(primaryTrigger());
    return compoundTrigger;
}

@Bean
public CronTrigger primaryTrigger() {
    return new CronTrigger(applicationProperties.getSchedule());
}

@Bean
public PeriodicTrigger secondaryTrigger() {
    return new PeriodicTrigger(applicationProperties.getRetryInterval());
}

@Bean
@ServiceActivator(inputChannel = "sftpChannel")
public MessageHandler dailyHandler(SimpleJobLauncher jobLauncher, Job job, Mail mail) {
    JobRunner jobRunner = new JobRunner(jobLauncher, job, store, mail);
    jobRunner.setDaily("true");
    jobRunner.setOverwrite("false");
    return jobRunner;
}