[NIFI-11121] If/Else/Switch processor

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Labels: processor suggestion
• Assignee: Unassigned
• Reporter: Josh McCullough
• Created: 31/Jan/23 19:42
• Updated: 02/Feb/23 02:22

Description

I'm a new user but I've already found it difficult to perform some logical operations e.g. "if X then Y else Z" or a switch option. I'm not sure if it's easy or hard to implement but let's consider a "switch" processor, here's how I think it would work...

... -- <some relationship> --> [Switch] -- <relationship1> --> [next processor]
                                 | | \---- <relationship2> --> [next processor]
                                 | \------ ...
                                 \-------- <relationshipN> --> [next processor]

In the properties for this process you could add parameters for each "case":

• Param Name: color is red
• Param Value: ${colorAttr.equals('red')

And additional cases for green/blue/etc. Which ever case results in `true` is the one that's chosen to follow. So the outgoing relationships would be: `color red`, `color green`, `color blue`.

Each case, when followed, would pass the incoming FlowFile along to the related relationship.

I realize this would require the ability to have dynamic / non-static relationships defined for a processor – not sure if this functionality already exists?