Polling consumer: how to recognize an empty directory

[Hilde <hi...@yahoo.de>]

Hello folks!

We create a polling consumer route via a dynamic router. When the transfer
is finished we recognize the end
by the header /CamelBatchComplete/ and we are able to stop the route. But
imagine the case when the directory of polling is empty. How can I find out
that to stop the route rapidly?

Cheers
Hilde



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Re: Polling consumer: how to recognize an empty directory

[Henryk Konsek <he...@gmail.com>]

> In Camel >= 2.0 "sendEmptyMessageWhenIdle" is a way to go :)

*2.9

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Henryk Konsek
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Re: Polling consumer: how to recognize an empty directory

[Henryk Konsek <he...@gmail.com>]

> Not with filter but I can check file name in some processor.

Ok, I get it :) I was wondering whether is it possible to achieve this
behavior with File component only.

Laters.

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Henryk Konsek
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Re: Polling consumer: how to recognize an empty directory

["michal.warecki" <mi...@gmail.com>]

Not with filter but I can check file name in some processor.

"sendEmptyMessageWhenIdle" is almost the same idea but is automatic and
doesn't produce message when files are in the directory. It is of course
better solution.



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Re: Polling consumer: how to recognize an empty directory

[Henryk Konsek <he...@gmail.com>]

> Just an idea:
>
> - before pooling, create a file with specified name, for example
> /TEST-POOLING/ and skip this file while processing. If there is only test
> file in directory, you will get /CamelBatchComplete/.
>
> - simpler: before starting the route, check if there is any file in
> particular directory :-)

I would not recommend such workarounds in Camel >= 2.9 since (as Achim
said) we got "sendEmptyMessageWhenIdle" to indicate that the directory
is empty. In Camel >= 2.0 "sendEmptyMessageWhenIdle" is a way to go :)
.

BTW Michał, How exactly you want to skip file from the processing? If
you exclude it with filter and it is only file in the directory, you
will got no message at all. :)

-- 
Henryk Konsek
http://henryk-konsek.blogspot.com

Re: Polling consumer: how to recognize an empty directory

["michal.warecki" <mi...@gmail.com>]

Just an idea:

- before pooling, create a file with specified name, for example
/TEST-POOLING/ and skip this file while processing. If there is only test
file in directory, you will get /CamelBatchComplete/.

- simpler: before starting the route, check if there is any file in
particular directory :-)



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Re: Polling consumer: how to recognize an empty directory

[Hilde <hi...@yahoo.de>]

Many thanks, the option /sendEmptyMessageWhenIdle/ helped for me.
Inside the route I can check the empty message as you can see below:

.choice()
   .when(body().isNull())
	.setHeader(CamelHeader.ANY_MESSAGE, simple("Directory is empty and transfer
is going to finish!"))
	.to("seda:" + SedaDirectDestinations.SEDA_INFOS_WHILE_TRANSFER)
	.bean(stopRoute)
   .otherwise()
     ... // transfer as usual

Have a nice weekend!

Hilde



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Re: Polling consumer: how to recognize an empty directory

[Achim Nierbeck <bc...@googlemail.com>]

Hi Hilde,

there is this flag "sendEmptyMessageWhenIdle"
to set on the file endpoint. This way you can tell wether the route is
idling and therefore are able to stop.

regards, Achim

2012/8/3 Hilde <hi...@yahoo.de>:
> Hello folks!
>
> We create a polling consumer route via a dynamic router. When the transfer
> is finished we recognize the end
> by the header /CamelBatchComplete/ and we are able to stop the route. But
> imagine the case when the directory of polling is empty. How can I find out
> that to stop the route rapidly?
>
> Cheers
> Hilde
>
>
>
> --
> View this message in context: http://camel.465427.n5.nabble.com/Polling-consumer-how-to-recognize-an-empty-directory-tp5716761.html
> Sent from the Camel - Users mailing list archive at Nabble.com.



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