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Camel - Stop route when the consuming directory not exists

由 心已入冬 提交于 2019-12-05 17:16:19

Finally I've solved it with consumer.exceptionHandler. But it seems, that this option is not in list of the usable options (http://camel.apache.org/file2.html which I've been reading again and again) just mentioned once with an example at the bottom of the huge page. Unfortunately, it was so "hidden" that I missed it up to now.

I set up a new class and implemented the handleExceptions methods:

public class DirNotExistsExHandler implements ExceptionHandler

which get the exceptions and decide what to do. In the context, I did a bean definition:

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

And in the consumer, passed the bean to the handler:

consumer.exceptionHandler=#dirNotExistsExHandler

Many thanks for your help!

In my opinion the best way to do it would be:

  1. Enable the option throwExceptionOnConnectFailed on the sftp endpoint like this:

    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&amp;throwExceptionOnConnectFailed=true

    This could help to manage with the exception and to be catch it by the camel routes onException. However I am not sure it is really necessary in your case.

  2. Make a special processing for your connection exception

    // 2a) Solution to redirect an empty body to a destination
onException(GenericFileOperationFailedException.class)
            .handled(true)
            .log(LoggingLevel.INFO, "Source directory not present: send empty body to shutdown route...")
            .setBody(null)
            .to("bean:shutdownRoute");

    Or another way:

    // 2b)Solution to just stop the processing without log in warn or error
onException(GenericFileOperationFailedException.class)
    .handled(true)
    .log(LoggingLevel.INFO, "Source directory not present: stop the process and wait until next time...")
    .stop();

UPDATE: I found this post and apparently there is not another way than implementing your own PollingConsumerPollStrategy because the GenericFileOperationFailedException is apparently handled inside the default implementation.

Handle the exception using doCatch block. If no exception is thrown then check file exists using your code and throw exception manually.

http://camel.apache.org/try-catch-finally.html

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apache-camel
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