apache-camel - Camel - 当消费目录不存在时停止路由

Question

我有一个 SFTP 路由(在 Spring XML 中)，它的 from 路径以每日更改的目录(即/yyyyMMdd)结尾，并且在 autoCreate=true 时一切正常或者路径开始时目录存在。但是如果目录不存在，我不允许创建目录!

当目录存在时，路由获取文件并自行终止。

当目录不存在时，路由会永久轮询并发出警告(即 org.apache.camel.component.file.GenericFileOperationFailedException: Cannot change directory to: 20160917 )并且永不停止。

如何避免这种行为(例如，将警告转换为空消息或异常或...)？我已经对startingDirectoryMustExist、consumer.bridgeErrorHandler 和许多其他人进行了实验，但没有任何成功。

简化路线(开始前，用实际日期填写 elmu.sftp.importDir 属性):

    <from
        uri="sftp://{{elmu.sftp.host}}:{{elmu.sftp.port}}{{elmu.sftp.importDir}}?username={{elmu.sftp.userName}}&amp;password={{elmu.sftp.password}}&amp;
        autoCreate=false&amp;preferredAuthentications=password&amp;binary=true&amp;include={{elmu.importMask}}&amp;initialDelay=100&amp;
        noop=true&amp;sortBy=file:name&amp;sendEmptyMessageWhenIdle=true"/>
    <choice>
        <when>
            <simple>${body} != null</simple>
            ... a lot of stuff ...
            <to uri="bean:shutdownRoute" />
        </when>
        <otherwise>
            <to uri="bean:shutdownRoute" />
        </otherwise>
    </choice>

与 directoryMustExist=true and startingDirectoryMustExist=true结果是一个带有此警告的无限循环(轮询):

08:30:14,658 WARN  SftpConsumer - Consumer Consumer[sftp://xxx.xxx.xx:22/DBHtest/ELMUteszt/Kiadott_adatok/20160918?autoCreate=false&binary=true&directoryMustExist=true&include=%5E.*%24&initialDelay=100&noop=true&password=xxxxxx&preferredAuthentications=password&sendEmptyMessageWhenIdle=true&sortBy=file%3Aname&startingDirectoryMustExist=true&username=xxx] failed polling endpoint: Endpoint[sftp://xxx:22/DBHtest/ELMUteszt/Kiadott_adatok/20160918?autoCreate=false&binary=true&directoryMustExist=true&include=%5E.*%24&initialDelay=100&noop=true&password=xxxxxx&preferredAuthentications=password&sendEmptyMessageWhenIdle=true&sortBy=file%3Aname&startingDirectoryMustExist=true&username=xxx]. Will try again at next poll. Caused by: [org.apache.camel.component.file.GenericFileOperationFailedException - Cannot change directory to: 20160918] 
org.apache.camel.component.file.GenericFileOperationFailedException: Cannot change directory to: 20160918
    at org.apache.camel.component.file.remote.SftpOperations.doChangeDirectory(SftpOperations.java:576)
    at org.apache.camel.component.file.remote.SftpOperations.changeCurrentDirectory(SftpOperations.java:564)
    at org.apache.camel.component.file.remote.SftpConsumer.doPollDirectory(SftpConsumer.java:107)
    at org.apache.camel.component.file.remote.SftpConsumer.pollDirectory(SftpConsumer.java:79)
    at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:131)
    at org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:175)
    at org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:102)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: 2: No such file
    at com.jcraft.jsch.ChannelSftp.throwStatusError(ChannelSftp.java:2846)
    at com.jcraft.jsch.ChannelSftp._realpath(ChannelSftp.java:2340)
    at com.jcraft.jsch.ChannelSftp.cd(ChannelSftp.java:342)
    at org.apache.camel.component.file.remote.SftpOperations.doChangeDirectory(SftpOperations.java:574)
    ... 13 more

它不适用于 stepwise=false :

11:52:19,210 WARN  SftpConsumer - Consumer Consumer[sftp://xxx:22/DBHtest/ELMUteszt/Kiadott_adatok/20160918?autoCreate=false&binary=true&directoryMustExist=true&include=%5E.*%24&initialDelay=100&noop=true&password=xxxxxx&preferredAuthentications=password&sendEmptyMessageWhenIdle=true&sortBy=file%3Aname&startingDirectoryMustExist=true&stepwise=false&username=xxx] failed polling endpoint: Endpoint[sftp://xxx:22/DBHtest/ELMUteszt/Kiadott_adatok/20160918?autoCreate=false&binary=true&directoryMustExist=true&include=%5E.*%24&initialDelay=100&noop=true&password=xxxxxx&preferredAuthentications=password&sendEmptyMessageWhenIdle=true&sortBy=file%3Aname&startingDirectoryMustExist=true&stepwise=false&username=xxx]. Will try again at next poll. Caused by: [org.apache.camel.component.file.GenericFileOperationFailedException - Cannot list directory: DBHtest/ELMUteszt/Kiadott_adatok/20160918] 
org.apache.camel.component.file.GenericFileOperationFailedException: Cannot list directory: DBHtest/ELMUteszt/Kiadott_adatok/20160918

更新(根据@ruffp 的回答):

我试图设置一个自定义的 PollingConsumerPollStrategy，但我无法阻止它的路由。只有第三(注释行)停止路线，但我有几条路线，我不知道实际路线的名称。我怎么才能得到它？

    @Override
    public boolean rollback(Consumer consumer, Endpoint endpoint, int retryCounter, Exception cause) throws Exception {
        consumer.getEndpoint().stop(); // 1
        consumer.stop();  // 2
        consumer.getEndpoint().getCamelContext().stopRoute(route???);  // 3
        return false;
    }

Answer 1

最后我用 consumer.exceptionHandler 解决了它.但似乎，此选项不在可用选项列表中 ( http://camel.apache.org/file2.html 我一直在反复阅读)刚刚在大页面底部举了一个例子。不幸的是，它是如此“隐藏”，以至于我到现在都没有看到它。

我设置了一个新类并实现了 handleExceptions 方法:

public class DirNotExistsExHandler implements ExceptionHandler

获得异常并决定做什么。在上下文中，我做了一个 bean 定义:

<bean id="dirNotExistsExHandler" class="hu.dbit.eleo.DirNotExistsExHandler" />

在消费者中，将 bean 传递给处理程序:

consumer.exceptionHandler=#dirNotExistsExHandler

非常感谢您的帮助!