Rx.Unity

A lightweight layer on top of System.Reactive to add support for Unity in a similar fashion as one using UniRx is used to. Thus one can enjoy the improvement made in System.Reactive over the years and consume libraries using it with ease.

Right now it requires some changes to System.Reactive in order to work but I'll try and create a PR to integrate required changes to the official System.Reactive repo soon.

What already works:

Backends:

Mono (including CI tests)
IL2CPP (including CI tests)

Platforms:

Part of the goal is to drop some legacy code from the UniRx code and start using a newer C# Syntax and framework versions. This also means that older versions of unity won't be supported. (Unity 2021.2+ is required)

Requirements

Your project must contain the following libraries somewhere:

System.Reactive.dll (>= 5.0.0; eg. from NuGet*)
Rx.Extendibility.dll (>= 1.0.2; eg. from NuGet*)
Rx.Data.dll (>= 1.0.2; eg. from NuGet*)

* needs to be build from source and as System.Reactive still needs a minor change that hasn't been integrated yet. Since System.Reactive is also signed Rx.Extendibility and Rx.Data also need to be recompiled to work with an unsigned version of System.Reactive. You can aquire the DLLs by running ./build-dependencies.bat in the repository root (you need docker with buildkit for this). After this the required DLLs can be found in ./Dependencies/out/.

Features

Other than the basic scheduling these are the features I moved over from UniRx:

Assembly: Rx.Data

.AsUnitObservable()
.AsSingleUnitObservable()
.Pairwise() (without overloads)
ReactiveProperty
ReactiveCollection
ReactiveDictionary (all of those incl. readonly variants)

Assembly: Rx.Unity

ObservableStateMachineTrigger
Observable.ReturnUnit()
Observable.EveryUpdate()
Observable.EveryFixedUpdate()
.UpdateAsObservable()
.OnDestroyAsObservable()
.ObserveOnMainThread() (without overloads)
.SubscribeOnMainThread() (without overloads)
.TakeUntilDestroy()
.DelayFrame()
.BatchFrame()
.SampleFrame() (since Version 1.0.1)

changes:

removed serialization support ReactiveProperty
removed serialization support ReactiveDictionary
removed IOptimizedObservable stuff

Errors in Subscribers:

There's a bit of a gotcha with the changes that have been made in System.Reactive since UniRx was forked:

If you have something like a subject and a direct subscriber to it throws an exception handleing an OnNext() everything works as expected.

However if you now introduce an operator between your subject and subscribe to that instead, an unhandled exception at the same spot as before, can lead to the source subject stopping emit future values (I haven't investigated the exact details on what happens to the subject beyond this description here). In UniRx this wasn't the case and that behaviour was ensured by the DurabilityTest-class.

After looking into it some System.Reactive code and doing some research on it, it looks to me like this is sort of a known issue that is a tolerated side effect which can seldomly happen as additional checks to detect this between every operator would hurt performance.

Important: when using Rx.Unity it is crucial that Rx.Unity.ReactiveUnity.SetupPatches() is executed before any other reactive code to ensure the environment is properly configured for unity.

UniRx Throttle-/ SampleFrame Fuuu:

(To help your sanity migrating to Rx.Unity)

ThrottleFrame

More like a debounce. Emits the last value of the previous frame the next frame unless another value was emited in the mean time. It always emits on the main thread.

ThrottleFirstFrame

A regular rx standard throttle, that emits in the source context (which might not be the main thread).

Emits the first value within each window. Each window is reset using the specified frameCount and frameCountType. Always emits the very first value right away.

SampleFrame

Does exactly what you expect it to do acording to rx standards.

Emits the last value of each window if any. Each window is reset using the specified frameCount and frameCountType. It always emits on the main thread. (Same as BatchFrame(frameCount, frameCountType).Select(x => x.Last()); Default parameter for frameCountType differs!)

License

Cosmic-Shores/Rx.Unity

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