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Introduce non-nullable types in reactive integrations where appropriate #3393

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Sep 20, 2022
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Introduce non-nullable types in reactive integrations where appropriate #3393

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ac0fd0e
Introduce non-nullable types in reactive integrations where appropriate
qwwdfsad Aug 5, 2022
34c08dd
~update nullability, fix some warnings
qwwdfsad Sep 20, 2022
508ce3a
~
qwwdfsad Sep 20, 2022
6b6fbd2
~
qwwdfsad Sep 20, 2022
fa472f9
~make changes compatible with Kotlin 1.8.0
qwwdfsad Sep 20, 2022
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3 changes: 1 addition & 2 deletions build.gradle
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Original file line number Diff line number Diff line change
Expand Up @@ -176,8 +176,7 @@ configure(subprojects.findAll { !sourceless.contains(it.name) }) {
tasks.withType(AbstractKotlinCompile).all {
kotlinOptions.freeCompilerArgs += OptInPreset.optInAnnotations.collect { "-Xopt-in=" + it }
kotlinOptions.freeCompilerArgs += "-progressive"
// Disable KT-36770 for RxJava2 integration
kotlinOptions.freeCompilerArgs += "-XXLanguage:-ProhibitUsingNullableTypeParameterAgainstNotNullAnnotated"
kotlinOptions.freeCompilerArgs += "-XXLanguage:+ProhibitUsingNullableTypeParameterAgainstNotNullAnnotated"
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// Remove null assertions to get smaller bytecode on Android
kotlinOptions.freeCompilerArgs += ["-Xno-param-assertions", "-Xno-receiver-assertions", "-Xno-call-assertions"]
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@cpovirk cpovirk Sep 20, 2022 •
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I'm not sure exactly what -progressive enables, but I notice that I can get a few more errors (noted above) if I enable the flags from #3007. (Thanks for pointing me here from there!)

        // Recognize rxjava3 nullness annotations even before that becomes the default (which may happen in 1.8): https://kotlinlang.org/docs/java-interop.html#nullability-annotations
        kotlinOptions.freeCompilerArgs += "-Xnullability-annotations=@io.reactivex.rxjava3.annotations:strict"
        // Recognize nullness annotations on type arguments, etc.: https://kotlinlang.org/docs/java-interop.html#annotating-type-arguments-and-type-parameters
        kotlinOptions.freeCompilerArgs += "-Xtype-enhancement-improvements-strict-mode"

}
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58 changes: 43 additions & 15 deletions reactive/kotlinx-coroutines-rx2/src/RxAwait.kt
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Expand Up @@ -24,9 +24,17 @@ import kotlin.coroutines.*
*/
public suspend fun CompletableSource.await(): Unit = suspendCancellableCoroutine { cont ->
subscribe(object : CompletableObserver {
override fun onSubscribe(d: Disposable) { cont.disposeOnCancellation(d) }
override fun onComplete() { cont.resume(Unit) }
override fun onError(e: Throwable) { cont.resumeWithException(e) }
override fun onSubscribe(d: Disposable) {
cont.disposeOnCancellation(d)
}

override fun onComplete() {
cont.resume(Unit)
}

override fun onError(e: Throwable) {
cont.resumeWithException(e)
}
})
}

Expand All @@ -43,12 +51,23 @@ public suspend fun CompletableSource.await(): Unit = suspendCancellableCoroutine
*/
@Suppress("UNCHECKED_CAST")
public suspend fun <T> MaybeSource<T>.awaitSingleOrNull(): T? = suspendCancellableCoroutine { cont ->
subscribe(object : MaybeObserver<T> {
override fun onSubscribe(d: Disposable) { cont.disposeOnCancellation(d) }
override fun onComplete() { cont.resume(null) }
override fun onSuccess(t: T) { cont.resume(t) }
override fun onError(error: Throwable) { cont.resumeWithException(error) }
})
subscribe(object : MaybeObserver<T & Any> {
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override fun onSubscribe(d: Disposable) {
cont.disposeOnCancellation(d)
}

override fun onComplete() {
cont.resume(null)
}

override fun onSuccess(t: T & Any) {
cont.resume(t)
}

override fun onError(error: Throwable) {
cont.resumeWithException(error)
}
} as MaybeObserver<T>)
}

/**
Expand Down Expand Up @@ -117,12 +136,21 @@ public suspend fun <T> MaybeSource<T>.awaitOrDefault(default: T): T = awaitSingl
* If the [Job] of the current coroutine is cancelled or completed while the suspending function is waiting, this
* function immediately disposes of its subscription and resumes with [CancellationException].
*/
@Suppress("UNCHECKED_CAST")
public suspend fun <T> SingleSource<T>.await(): T = suspendCancellableCoroutine { cont ->
subscribe(object : SingleObserver<T> {
override fun onSubscribe(d: Disposable) { cont.disposeOnCancellation(d) }
override fun onSuccess(t: T) { cont.resume(t) }
override fun onError(error: Throwable) { cont.resumeWithException(error) }
})
subscribe(object : SingleObserver<T & Any> {
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override fun onSubscribe(d: Disposable) {
cont.disposeOnCancellation(d)
}

override fun onSuccess(t: T & Any) {
cont.resume(t)
}

override fun onError(error: Throwable) {
cont.resumeWithException(error)
}
} as SingleObserver<T>)
}

// ------------------------ ObservableSource ------------------------
Expand Down Expand Up @@ -225,7 +253,7 @@ private suspend fun <T> ObservableSource<T>.awaitOne(
cont.invokeOnCancellation { sub.dispose() }
}

override fun onNext(t: T) {
override fun onNext(t: T & Any) {
when (mode) {
Mode.FIRST, Mode.FIRST_OR_DEFAULT -> {
if (!seenValue) {
Expand Down
16 changes: 9 additions & 7 deletions reactive/kotlinx-coroutines-rx2/src/RxChannel.kt
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Expand Up @@ -31,22 +31,24 @@ public suspend inline fun <T> ObservableSource<T>.collect(action: (T) -> Unit):
toChannel().consumeEach(action)

@PublishedApi
@Suppress("UNCHECKED_CAST")
internal fun <T> MaybeSource<T>.toChannel(): ReceiveChannel<T> {
val channel = SubscriptionChannel<T>()
subscribe(channel)
(this as MaybeSource<T & Any>).subscribe(channel)
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return channel
}

@PublishedApi
@Suppress("UNCHECKED_CAST")
internal fun <T> ObservableSource<T>.toChannel(): ReceiveChannel<T> {
val channel = SubscriptionChannel<T>()
subscribe(channel)
(this as ObservableSource<T & Any>).subscribe(channel)
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return channel
}

@Suppress("INVISIBLE_REFERENCE", "INVISIBLE_MEMBER")
private class SubscriptionChannel<T> :
LinkedListChannel<T>(null), Observer<T>, MaybeObserver<T>
LinkedListChannel<T>(null), Observer<T & Any>, MaybeObserver<T & Any>
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{
private val _subscription = atomic<Disposable?>(null)

Expand All @@ -60,12 +62,12 @@ private class SubscriptionChannel<T> :
_subscription.value = sub
}

override fun onSuccess(t: T) {
override fun onSuccess(t: T & Any) {
trySend(t)
close(cause = null)
}

override fun onNext(t: T) {
override fun onNext(t: T & Any) {
trySend(t) // Safe to ignore return value here, expectedly racing with cancellation
}

Expand All @@ -80,15 +82,15 @@ private class SubscriptionChannel<T> :

/** @suppress */
@Deprecated(message = "Deprecated in the favour of Flow", level = DeprecationLevel.HIDDEN) // ERROR in 1.4.0, HIDDEN in 1.6.0
public fun <T> ObservableSource<T>.openSubscription(): ReceiveChannel<T> {
public fun <T> ObservableSource<T & Any>.openSubscription(): ReceiveChannel<T> {
val channel = SubscriptionChannel<T>()
subscribe(channel)
return channel
}

/** @suppress */
@Deprecated(message = "Deprecated in the favour of Flow", level = DeprecationLevel.HIDDEN) // ERROR in 1.4.0, HIDDEN in 1.6.0
public fun <T> MaybeSource<T>.openSubscription(): ReceiveChannel<T> {
public fun <T> MaybeSource<T & Any>.openSubscription(): ReceiveChannel<T> {
val channel = SubscriptionChannel<T>()
subscribe(channel)
return channel
Expand Down
44 changes: 24 additions & 20 deletions reactive/kotlinx-coroutines-rx3/src/RxAwait.kt
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Expand Up @@ -41,9 +41,8 @@ public suspend fun CompletableSource.await(): Unit = suspendCancellableCoroutine
* If the [Job] of the current coroutine is cancelled or completed while this suspending function is waiting, this
* function immediately resumes with [CancellationException] and disposes of its subscription.
*/
@Suppress("UNCHECKED_CAST")
public suspend fun <T> MaybeSource<T>.awaitSingleOrNull(): T? = suspendCancellableCoroutine { cont ->
subscribe(object : MaybeObserver<T> {
public suspend fun <T> MaybeSource<T & Any>.awaitSingleOrNull(): T? = suspendCancellableCoroutine { cont ->
subscribe(object : MaybeObserver<T & Any> {
override fun onSubscribe(d: Disposable) { cont.disposeOnCancellation(d) }
override fun onComplete() { cont.resume(null) }
override fun onSuccess(t: T) { cont.resume(t) }
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T & Any

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This bound seems to be properly propagated from the declaration site

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Since the object is implementing MaybeObserver<T & Any>, I think the method parameter needs to be T & Any to match.

Or you know what, actually, even if we were implementing plain MaybeObserver<T>, we'd probably still need the method parameter to be T & Any, since the interface declares its method as requiring a @NonNull T:

https://github.com/ReactiveX/RxJava/blob/8e53e0ee1637791923a81fdb9d17dfe8c1569250/src/main/java/io/reactivex/rxjava3/core/MaybeObserver.java#L76

I think that's why, with the current parameter type of T, the build fails with the flags I posted in the build script.

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Thanks for pointing it out. T & Any is required since Kotlin 1.8.0, it was an omission on the language site

Expand All @@ -61,7 +60,7 @@ public suspend fun <T> MaybeSource<T>.awaitSingleOrNull(): T? = suspendCancellab
*
* @throws NoSuchElementException if no elements were produced by this [MaybeSource].
*/
public suspend fun <T> MaybeSource<T>.awaitSingle(): T = awaitSingleOrNull() ?: throw NoSuchElementException()
public suspend fun <T> MaybeSource<T & Any>.awaitSingle(): T = awaitSingleOrNull() ?: throw NoSuchElementException()

/**
* Awaits for completion of the maybe without blocking a thread.
Expand All @@ -84,7 +83,7 @@ public suspend fun <T> MaybeSource<T>.awaitSingle(): T = awaitSingleOrNull() ?:
level = DeprecationLevel.ERROR,
replaceWith = ReplaceWith("this.awaitSingleOrNull()")
) // Warning since 1.5, error in 1.6, hidden in 1.7
public suspend fun <T> MaybeSource<T>.await(): T? = awaitSingleOrNull()
public suspend fun <T> MaybeSource<T & Any>.await(): T? = awaitSingleOrNull()

/**
* Awaits for completion of the maybe without blocking a thread.
Expand All @@ -107,7 +106,7 @@ public suspend fun <T> MaybeSource<T>.await(): T? = awaitSingleOrNull()
level = DeprecationLevel.ERROR,
replaceWith = ReplaceWith("this.awaitSingleOrNull() ?: default")
) // Warning since 1.5, error in 1.6, hidden in 1.7
public suspend fun <T> MaybeSource<T>.awaitOrDefault(default: T): T = awaitSingleOrNull() ?: default
public suspend fun <T> MaybeSource<T & Any>.awaitOrDefault(default: T): T = awaitSingleOrNull() ?: default

// ------------------------ SingleSource ------------------------

Expand All @@ -119,10 +118,10 @@ public suspend fun <T> MaybeSource<T>.awaitOrDefault(default: T): T = awaitSingl
* If the [Job] of the current coroutine is cancelled or completed while the suspending function is waiting, this
* function immediately disposes of its subscription and resumes with [CancellationException].
*/
public suspend fun <T> SingleSource<T>.await(): T = suspendCancellableCoroutine { cont ->
subscribe(object : SingleObserver<T> {
public suspend fun <T> SingleSource<T & Any>.await(): T = suspendCancellableCoroutine { cont ->
subscribe(object : SingleObserver<T & Any> {
override fun onSubscribe(d: Disposable) { cont.disposeOnCancellation(d) }
override fun onSuccess(t: T) { cont.resume(t) }
override fun onSuccess(t: T & Any) { cont.resume(t) }
override fun onError(error: Throwable) { cont.resumeWithException(error) }
})
}
Expand All @@ -139,7 +138,8 @@ public suspend fun <T> SingleSource<T>.await(): T = suspendCancellableCoroutine
*
* @throws NoSuchElementException if the observable does not emit any value
*/
public suspend fun <T> ObservableSource<T>.awaitFirst(): T = awaitOne(Mode.FIRST)
@Suppress("UNCHECKED_CAST")
public suspend fun <T> ObservableSource<T & Any>.awaitFirst(): T = awaitOne(Mode.FIRST) as T

/**
* Awaits the first value from the given [Observable], or returns the [default] value if none is emitted, without
Expand All @@ -150,7 +150,9 @@ public suspend fun <T> ObservableSource<T>.awaitFirst(): T = awaitOne(Mode.FIRST
* If the [Job] of the current coroutine is cancelled or completed while the suspending function is waiting, this
* function immediately disposes of its subscription and resumes with [CancellationException].
*/
public suspend fun <T> ObservableSource<T>.awaitFirstOrDefault(default: T): T = awaitOne(Mode.FIRST_OR_DEFAULT, default)
@Suppress("UNCHECKED_CAST")
public suspend fun <T> ObservableSource<T & Any>.awaitFirstOrDefault(default: T): T =
awaitOne(Mode.FIRST_OR_DEFAULT, default) as T

/**
* Awaits the first value from the given [Observable], or returns `null` if none is emitted, without blocking the
Expand All @@ -161,7 +163,7 @@ public suspend fun <T> ObservableSource<T>.awaitFirstOrDefault(default: T): T =
* If the [Job] of the current coroutine is cancelled or completed while the suspending function is waiting, this
* function immediately disposes of its subscription and resumes with [CancellationException].
*/
public suspend fun <T> ObservableSource<T>.awaitFirstOrNull(): T? = awaitOne(Mode.FIRST_OR_DEFAULT)
public suspend fun <T> ObservableSource<T & Any>.awaitFirstOrNull(): T? = awaitOne(Mode.FIRST_OR_DEFAULT)

/**
* Awaits the first value from the given [Observable], or calls [defaultValue] to get a value if none is emitted,
Expand All @@ -172,7 +174,7 @@ public suspend fun <T> ObservableSource<T>.awaitFirstOrNull(): T? = awaitOne(Mod
* If the [Job] of the current coroutine is cancelled or completed while the suspending function is waiting, this
* function immediately disposes of its subscription and resumes with [CancellationException].
*/
public suspend fun <T> ObservableSource<T>.awaitFirstOrElse(defaultValue: () -> T): T =
public suspend fun <T> ObservableSource<T & Any>.awaitFirstOrElse(defaultValue: () -> T): T =
awaitOne(Mode.FIRST_OR_DEFAULT) ?: defaultValue()

/**
Expand All @@ -185,7 +187,8 @@ public suspend fun <T> ObservableSource<T>.awaitFirstOrElse(defaultValue: () ->
*
* @throws NoSuchElementException if the observable does not emit any value
*/
public suspend fun <T> ObservableSource<T>.awaitLast(): T = awaitOne(Mode.LAST)
@Suppress("UNCHECKED_CAST")
public suspend fun <T> ObservableSource<T & Any>.awaitLast(): T = awaitOne(Mode.LAST) as T

/**
* Awaits the single value from the given observable without blocking the thread and returns the resulting value, or,
Expand All @@ -198,26 +201,27 @@ public suspend fun <T> ObservableSource<T>.awaitLast(): T = awaitOne(Mode.LAST)
* @throws NoSuchElementException if the observable does not emit any value
* @throws IllegalArgumentException if the observable emits more than one value
*/
public suspend fun <T> ObservableSource<T>.awaitSingle(): T = awaitOne(Mode.SINGLE)
@Suppress("UNCHECKED_CAST")
public suspend fun <T> ObservableSource<T & Any>.awaitSingle(): T = awaitOne(Mode.SINGLE) as T

// ------------------------ private ------------------------

internal fun CancellableContinuation<*>.disposeOnCancellation(d: Disposable) =
invokeOnCancellation { d.dispose() }

private enum class Mode(val s: String) {
private enum class Mode(@JvmField val s: String) {
FIRST("awaitFirst"),
FIRST_OR_DEFAULT("awaitFirstOrDefault"),
LAST("awaitLast"),
SINGLE("awaitSingle");
override fun toString(): String = s
}

private suspend fun <T> ObservableSource<T>.awaitOne(
private suspend fun <T> ObservableSource<T & Any>.awaitOne(
mode: Mode,
default: T? = null
): T = suspendCancellableCoroutine { cont ->
subscribe(object : Observer<T> {
): T? = suspendCancellableCoroutine { cont ->
subscribe(object : Observer<T & Any> {
private lateinit var subscription: Disposable
private var value: T? = null
private var seenValue = false
Expand All @@ -227,7 +231,7 @@ private suspend fun <T> ObservableSource<T>.awaitOne(
cont.invokeOnCancellation { sub.dispose() }
}

override fun onNext(t: T) {
override fun onNext(t: T & Any) {
when (mode) {
Mode.FIRST, Mode.FIRST_OR_DEFAULT -> {
if (!seenValue) {
Expand Down