Spring SFTP入站适配器出现问题

Question

我需要从SFTP位置收集文件，并定期将其放入本地输入目录。 传输文件后，文件将从SFTP位置删除。 对于触发器，我使用自定义的Cron触发器，在其中动态更改间隔。 以下是context.xml中的条目以及CustomCronTrigger类的代码。

<bean id="sftpSessionFactory" class="org.springframework.integration.sftp.session.DefaultSftpSessionFactory">
    <property name="host" value="127.0.0.1"/>
    <property name="port" value="22"/>
    <property name="user" value="user"/>
    <property name="password" value="passwd"/>
</bean>

<int-sftp:inbound-channel-adapter id="sftpInboundAdapter"
        channel="receiveChannel" 
        session-factory="sftpSessionFactory" 
        local-directory="/home/sftpUser"
        remote-directory="/home/input"
        delete-remote-files="true"
        auto-create-local-directory="true"
        filename-pattern="*.csv"
        >
    <int:poller trigger="customCronTrigger"/>

</int-sftp:inbound-channel-adapter>

<int:channel id="receiveChannel">
    <int:queue/>
</int:channel>

public class CustomCronTrigger implements Trigger{

    private CronSequenceGenerator sequenceGenerator;

    private String intervalInMin;

    public void setIntervalInMin(String intervalInMin) throws Exception
    {
        this.intervalInMin = intervalInMin;
        createCronExpression();
    }

    /** The logger instance */
    private Logger logger = LoggerFactory.getLogger(getClass());

    public CronSequenceGenerator getSequenceGenerator() {
        return sequenceGenerator;
    }

    public void createCronExpression() throws Exception {
        String cronExpression = getCronExpression(intervalInMin);
        logger.debug("CustomCronTrigger.setSequenceGeneratorStr()::cronExpression="+cronExpression);
        this.sequenceGenerator = new CronSequenceGenerator(cronExpression, TimeZone.getDefault());
    }

    public Date nextExecutionTime(TriggerContext triggerContext) {
        Date date = triggerContext.lastCompletionTime();
        if (date != null) {
            Date scheduled = triggerContext.lastScheduledExecutionTime();
            if (scheduled != null && date.before(scheduled)) {
                // Previous task apparently executed too early...
                // Let's simply use the last calculated execution time then,
                // in order to prevent accidental re-fires in the same second.
                date = scheduled;
            }
        }
        else {
            date = new Date();
        }
        return this.sequenceGenerator.next(date);
    }

    public String getCronExpression(String min) throws Exception
    {
        if(Integer.parseInt(min)<0 || Integer.parseInt(min)>59 )
        {
            throw new Exception(String.format("Minute %s not valid. Please enter minute between 0-59",min));
        }
        String cronExpression = "0 0/"+min+" * * * ?";
        return cronExpression;
    }


    @Override
    public boolean equals(Object obj) {
        return (this == obj || (obj instanceof CustomCronTrigger &&
                this.sequenceGenerator.equals(((CustomCronTrigger) obj).sequenceGenerator)));
    }

    @Override
    public int hashCode() {
        return this.sequenceGenerator.hashCode();
    }

    @Override
    public String toString() {
        return this.sequenceGenerator.toString();
    }
}

在第一个间隔中，文件会正确传输，然后从源目录中删除，尽管日志显示仅传输了一个文件。 在连续的时间间隔中，文件不会被传输，只有在一定的时间间隔后才会被传输。 读取日志并不能说明为什么后续文件未能按时传输。 以下是sftp的日志。

*** 18 Nov 2013 11:49:00[L=INFO] [T=task-scheduler-1] (org.springframework.integration.file.FileReadingMessageSource:264 receive())
    Created message: [[Payload=/home/sftpUser/abc.csv][Headers={timestamp=1384755540001, id=fce1bea5-6444-4000-9b29-9a48e6027814}]]

*** 18 Nov 2013 11:50:00[L=INFO] [T=task-scheduler-2] (org.springframework.integration.file.FileReadingMessageSource:264 receive())
    Created message: [[Payload=/home/sftpUser/xyz.csv][Headers={timestamp=1384755600000, id=7a9c38b0-163c-473d-842b-58b41af8ad2d}]]

*** 18 Nov 2013 11:51:00[L=INFO] [T=task-scheduler-1] (org.springframework.integration.file.FileReadingMessageSource:264 receive())
    Created message: [[Payload=/home/sftpUser/def.csv][Headers={timestamp=1384755660001, id=3b10b954-3c16-4bf8-9b69-7fc213c68f37}]]

*** 18 Nov 2013 11:52:00[L=INFO] [T=task-scheduler-3] (org.springframework.integration.file.FileReadingMessageSource:264 receive())
    Created message: [[Payload=/home/sftpUser/ghi.csv][Headers={timestamp=1384755720028, id=e1031613-788d-45f9-a2ae-30f953832ff7}]]

请提出替代方案，因为我对这个问题不知所措。

Answer 1

目前尚不清楚“连续的时间间隔不会传输文件，而是仅在一定的间隔后才传输文件”的含义。

请注意，如果您希望传输具有相同名称的文件，则该文件将无法工作，因为默认的本地过滤器将禁止为其生成消息。 即将发布的3.0版本具有新的local-filter属性来更改该行为，或者您可以改用网关，如我在此答案中所建议。