Wait in a loop

[jeremyjong]

My first day on KNIME here and am very impressed with all the functionality KNIME can do!
Ive made a workflow as below, everything seems to be doing what its suppose to, but I just cant seem to get the whole workflow to loop infinitely.
Any suggestions?

Thanks in advance.

[mlauber71]

@jeremyjong welcome to the KNIME forum

Concerning Loops you might want to start educating yourself with some of these links (especially concerning the ones about loops):

A meta collection about Loops, Switches, Paths and Flow Variables in KNIME...

For your tasks you might try to use a condition that would never be met in:

Variable Condition Loop End (deprecated)

But you will have to be careful letting run a service/task indefinitely on a machine. You should plan ahead.

A somewhat more complicated example is here to do certain tasks if conditions are met within a loop.

Start a Workflow, e. g. a database query, after a certain time

@USCHUKN1ME I tried to build a system you might be able to expand and use. The idea is to have a workflow that would iterate a number of times (v_number_of_intervals) with a set interval (of seconds) between (v_seconds_interval) them. The workflow looks for a trigger_file.csv if this file has changed from the last time the loop has run a component would be executed. If the file has not changed nothing would happen. Admittedly not the most elegant way but you could build a small automatic execu…

For a lot of automation you might want to take a look at the KNIME server (KNIME Business Hub | KNIME), since it is built to handle such jobs.