Is Worklets Library Supporting Calling React Module From Android Native Java Code?

[seito-simonng]

I was looking for multithreading library, that worklets seem only way to achieve this goal.
But i has been study worklets about 2 weeks to implementing Worklets thread running Android Native Java Code.

For my situation is i am developing a RN Apps, that required continues polling the hardware by Android SDK only and the communication between RN Apps and Hardware may required few seconds process time. As RN Apps is single thread architecture. When polling from the hardware would have a noticeable delay from the UI and i would have a chance polling more than 1 hardware.

Is the Worklets able to do this? And i has been asking AI and study from the internet for Worklets work on Android Native Java Code.
Is any one can help? Thank you so much.

[tjzel]

Hi @seito-simonng, could you elaborate on your use-case?

If you're asking if it's possible to use React Native TurboModules in a multi-threaded way - unfortunately no. For the time being and by design they can be called only on the RN Runtime (JS Thread).

If you want to call your custom JavaScript bindings, linking via JNI to native Android functions, then yes, you can do it with Worklets although we don't provide any explicit APIs for that as this is a very advanced application.

[seito-simonng]

Thank you so much, Sorry for my bad English since i am not native with.

I think the seconds answer should be what i looking for (I am looking for calling Native Android function form Worklets runtime thread, not run back to UI Thread to do so). But i not sure is it was i through. So let explain my case with much more details.

For my use case, I building a POS System. That required to connect to network printer with Android SDK Only.
And i would have a extremely high possibilities to connect multiple printer from single apps.
Then i would polling the printers status as monitoring and alert.

For those Android SDK i already extends as a Native Module and call from React Native Successfully before.
But at that time i was only connect and keep the connection and send print request as i needed.
So i didn't test polling action. after implement the polling printer status, the nightmare has come.
The UI was already laggy since the polling action is share with the JS Thread.

Then i find your library that was able to implement multi-threading, So what i looking for is when i polling 1 printers would create a single Worklets Runtime Thread to do so. So, when i have 5 printers i would likely have a 5 Worklets Runtime Threads to polling the printers status. Then i can interact with UI nicely without any blocking and also at the same time polling 5 printers from background in heavy work.

** The Native Module Code was only implement connect, print, disconnect, getStatus functions, I am not prefer implement any Threading Logic in Native Module Code. The whole threading logic should done by Worklets Library.

After install Worklets Library and i tried calling with those native module then Apps is keep crashing. After few studies, I think i should need to transfer to Turbo Module as my understand Worklets Library would required JNI to interface with Native Code. But i still struggle with that. I tried for 3 days still no luck with that. And there almost no any example with that.

*** And extra question ***
I found out there a 3rd party developed Nitro Module which is faster than Turbo Module, But i not sure is it supported by Worklets Library.

Thanks for your attentions. Can you solve my question? Thank you so much.

[tjzel]

Sorry for the late answer. I think what's best for you is to make JSI bindings to these native functions you mentioned and inject them into each of the runtimes that you create - but that requires a lot of coding.

Speaking of Nitro Modules, they should soon be compatible with react-native-worklets so you could create a Nitro Module and use it across different runtimes.