disable a flow on the basis of file availability

[sahil786]

Hi All,

Is there any provision in knime to disable a flow in the workflow on the basis of file availability?
For eg: if file is not available in the given location, then can we disable the flow in front of it.
I need to make some nodes conditional. Empty table switch wont work here.

Kindly suggest.

[Luca_Italy]

Hi,
you can you this node by Vernalis, Flow Variable IF Switch, by installing the extension.

Then you have to check if a file is present or not in a directory, so list files does this.
With groupby i count the number of files, convert that number in a variable, adding some logic into rule engine (count = 0 => “top”, TRUE => “bottom”), and then plugging this variable to control the switch:

So, in case of 0 files, you’ll trigger the top flow, otherwise the bottom flow.

Hope it works for you.

Luca

[sahil786]

Hi Thank u so much for the solution, But list file is working fine on desktop version but is not supporting on server by throwing error:Remote directories not supported.
Is there any other node for server

[Luca_Italy]

Do you mean KNIME server?
u can use this configuration instead:

[sahil786]

Ok great…Thanks A lot…

[ipazin]

Hello @sahil786,

but if List Files node returns empty data (or any node that follows it) why Empty Table Switch node won’t work?

Br,
Ivan

[sahil786]

Hi @ipazin

I was not aware about list file node… that is why i was saying that only empty table switch wont work dere…but aftr list file node…it is working fine…

Thanks for looking into it…