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From David Gallagher <>
Subject Open / Close Gate examples?
Date Fri, 17 May 2019 16:30:06 GMT
Hi - I have a requirement to read one message off RabbitMQ and fully process that message before
I take another message off the queue. I found some great guidance to setting up a 'traffic
light' pattern here (,
but it won't work for my process because the Notify will get triggered by the GenerateFlowFile
before the long-running process triggers, which will put two or more messages into the process
at once. The documentation for Notify makes reference to using a 0 value in Signal Counter
Delta to simulate 'open-close-gate' flow control, which sounds like what I'm looking for.
Can someone point me in the right direction?



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