Lamdba in rules file

[Garbisa]

Is it possible to use Lambdas which are defined in another rules files?

[Garbisa]

Design Pattern: DRY, How Not to Repeat Yourself in Rules DSL

Please see Design Pattern: What is a Design Pattern and How Do I Use Them for details on what a DP is and how to use it. Problem Statement Do Not Repeat Yourself (DRY) Often an inexperienced programmer will find that a naive and straight forward approach to writing Rules DSL Rules results in a lot of duplicated code. Often experienced programmers find that the usual tools to avoid duplicated code like data structures and classes are not available in Rules DSL and they end up fighting the lang…

So Lambdas are not useful for my situation. I will go with Proxy Items

[rlkoshak (Rich Koshak)]

@Garbisa

So Lambdas are not useful for my situation. I will go with Proxy Items

I’ve never tried it and can’t guarantee it will work, but theoretically you should be able to put a lambda into the shared cache. Back when I wrote that post there wasn’t a shared cache. See Rules | openHAB.

I can’t remember if it was added to Rules DSL before or after 3.4 release so if you see errors saying sharedCache is not defined you’ll have to wait for OH 4 to use it.

But IMO if you are heading down this path it’s a strong indication you’ve outgrown Rules DSL and one of the other languages might be a better fit.

[Garbisa]

Thanks for your remarks.
Do you have some lines of code how to use the “shared cache”?

[rlkoshak (Rich Koshak)]

I linked to the docs that talk about the shared cache which includes

For further documentation on using the cache see here

which includes examples. Do you have specific questions after reading those docs and examples?