Major Edit: Rewrote with the cleaner OH 2.3 syntax. The example lambda on the OH 1 wiki is overly complex and as written will not work in OH 2. This quick example will show a super simple lambda example with copious notes. Here is the code without comments. It takes in an Item, logs it’s state and…

Wow… two years later! Nowadays, you just use Jython and put the function in a module that can be called from any rule in any file or even from a UI rule.

[image] rossko57: But you cannot call a function in one xxx.rules file from rules in some other zzz.rules file. I mean right this. From another rule files. I would like to make a logging function, that sends logs to syslog, email and telegramm. Of course logs comes from different rules files…

[image] 5iver: Nowadays, you just use Jython and put the function in a module that can be called from any rule in any file or even from a UI rule. Jyton. I have not heard about it. I asked google and it looks like another language and there is not much examples how to use it. Maybe u know a …

[image] thisisIO: Maybe u know a good tutorial or thread here with explanation? You can use the new rule engine and do scripted automation using Jython, which is Python for the JVM. The OH docs are a bit meager . It has some important information, but don’t follow those installation instructio…

[image] thisisIO: Of course logs comes from different rules files. If you post your logging messages to Item states, these are common to all rules, whatever their source - xxx.rules files, Jython, etc.

[image] rossko57: If you post your logging messages to Item states, these are common to all rules, whatever their source - xxx.rules files, Jython, etc. This is demonstrated in Design Pattern: Separation of Behaviors

Do lambas go in .rules files? I ask because the example is giving me validation warnings with OH2.5M5: [image] rlkoshak: val log= [ GenericItem s | logInfo("lambda", s.state.toString) s.state.toString + " logged" ] 2019-11-26 08:15:26.434 [WARN ] [el.core.internal.ModelRepositoryImp…

[image] dbadia: Do lambas go in .rules files? Yes, but they must go at the top of the file before all your Rules. This error is coming from line 97 which means your lambda is likely after the definition of a Rule or the error is coming from a Rule. I should note that global lambdas like this…

@rlkoshak I’m looking into lamdas and found your post. Is it worth rewriting to include notes for JRS223 Python/Jython? Maybe there’s a good design pattern article. I’m still searching Regards, Burzin

Functions are available as a basic part of the Scripted Automation languages. If you take a week long course on Python, functions will be introduced somewhere on the morning of the first day. I didn’t include Python or JavaScript in the above DP because, for all purposes, the above DP doesn’t apply …

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Reusable Functions: A simple lambda example with copious notes

Tutorials & Examples

rlkoshak (Rich Koshak) November 16, 2019, 4:36pm 27

This is demonstrated in Design Pattern: Separation of Behaviors