Only Trigger Rule Once

[ritchierich]

@672southmain

Seems to me that this is almost impossible in a system that is event driven, as Hubitat is, and in which Rules schedule items for future execution.

Actually not true, in v2.2.9 @gopher.ny added a "singleThreaded" setting for drivers and apps that prevents multiple executions of that code.

[2.2.9] singleThreaded option for apps/drivers

This was in release notes but way down, so I figured it deserves a special mention here in Developers section. So... singleThreaded is a boolean option that belongs in app/driver definition, with default value of false, meaning apps/drivers behave the way they always did. If set to true, though, hub runs all methods for a particular instance of app/driver sequentially, one at a time. It will load app/driver instance data (including state) run a method, and save the data (including state) comple…

I use it quite a bit in my custom drivers and apps. But this said I did find it doesn't work with child apps of a parent. So not sure this would work in its current version with Rule Machine.

@Alan_F

Behind the scenes it could implement a 'set Private Boolean false' at the top of the rule and a 'set Private Boolean true' at the end, with a required expression of 'private Boolean is true, with all of those mechanics hidden from the user and only the 'single instance' toggle visible.

I would prefer that the singleThreaded feature be leveraged vs private boolean.

I do support @sburke781's feature request here because I had a rule in place that kept logging multiple execution errors in the log and I had to write my own custom app instead to get aroung that.