Camel Route File Polling Mechanism

[stephen daniel]

I have about 500 files in 1 folder that i want to route using the Camel Route.

My question is, what is the mechanism of Camel to determine which file will be send first, second, third and so on. Is it random polling or there is a logic there to determine that order?

Note :

I have problem with my connection, so it become triple post. Sorry for the incovenience.

Edited by: mari_yaguchi on Mar 18, 2013 3:20 AM

[Freeman(Yue) Fang]

Hi,

You can use sorter or sortBy option for camel-file endpoint, take a look at to get more details

http://camel.apache.org/file2.html

Freeman

[stephen daniel]

Thanks ffang for your answer.

But, i want to know too about the default mechanism of Camel to polling and send file without set the "sortBy" option, is it really random? or there is some logics there? Thanks

[Freeman(Yue) Fang]

AFAK if there's no sorter or sortBy specified, it just build a list using the return array of java.io.File.listFiles(), take a look at comment from java.io.File.listFiles()

* <p> There is no guarantee that the name strings in the resulting array
     * will appear in any specific order; they are not, in particular,
     * guaranteed to appear in alphabetical order.

So there's no guarantee order per JDK implementation.

Freeman

[stephen daniel]

Thanks for the answer ffang its really helpfull,

I just find something here, i tried to run the camel in windows and linux. In windows, Camel poll and send the file based on alphabetical order, and in linux its not. So i guessed the OS here also determined the order?

[Freeman(Yue) Fang]

It could be.

Most likely java.io.File.listFiles() need call into OS native API to get files under a certain folder so the behavior isn't identical across platforms.

Freeman

[stephen daniel]

Thanks for the explanation. Really appreciate that

[Claus Ibsen]

You can use the sortBy or sorter option on the file component to sort the files

http://camel.apache.org/file2

[stephen daniel]

-- Edited --

Edited by: mari_yaguchi on Mar 20, 2013 8:59 AM

[stephen daniel]

Hi,

I just want to know if there is no specific order when Camel poll the file, how can I get the same order if I try to run a route twice? it exactly give me the same order.

[Claus Ibsen]

Its the OS / JVM that returns the list in the order it decides to do. So it may appear in the same order.