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Deprecate suspending variant of "binding" in favour of "coroutineBind…
…ing" This matches the internally-called function named coroutineScope, and helps consumers distinguish between the blocking variant that is otherwise only differing in package name. This should also help convey to readers that structured concurrency will occur within the block.
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70 changes: 70 additions & 0 deletions
70
...utines/src/commonMain/kotlin/com/github/michaelbull/result/coroutines/CoroutineBinding.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package com.github.michaelbull.result.coroutines | ||
|
|
||
| import com.github.michaelbull.result.Err | ||
| import com.github.michaelbull.result.Ok | ||
| import com.github.michaelbull.result.Result | ||
| import kotlinx.coroutines.CancellationException | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.Job | ||
| import kotlinx.coroutines.cancel | ||
| import kotlinx.coroutines.coroutineScope | ||
| import kotlinx.coroutines.sync.Mutex | ||
| import kotlinx.coroutines.sync.withLock | ||
| import kotlin.contracts.InvocationKind | ||
| import kotlin.contracts.contract | ||
| import kotlin.coroutines.CoroutineContext | ||
|
|
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| /** | ||
| * Suspending variant of [binding][com.github.michaelbull.result.binding]. | ||
| * The suspendable [block] runs in a new [CoroutineScope], inheriting the parent [CoroutineContext]. | ||
| * This new scope is [cancelled][CoroutineScope.cancel] once a failing bind is encountered, eagerly cancelling all | ||
| * child [jobs][Job]. | ||
| */ | ||
| public suspend inline fun <V, E> coroutineBinding(crossinline block: suspend CoroutineBindingScope<E>.() -> V): Result<V, E> { | ||
| contract { | ||
| callsInPlace(block, InvocationKind.EXACTLY_ONCE) | ||
| } | ||
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| lateinit var receiver: CoroutineBindingScopeImpl<E> | ||
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| return try { | ||
| coroutineScope { | ||
| receiver = CoroutineBindingScopeImpl(this) | ||
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| with(receiver) { | ||
| Ok(block()) | ||
| } | ||
| } | ||
| } catch (ex: BindCancellationException) { | ||
| receiver.result!! | ||
| } | ||
| } | ||
|
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| internal object BindCancellationException : CancellationException(null as String?) | ||
|
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| public interface CoroutineBindingScope<E> : CoroutineScope { | ||
| public suspend fun <V> Result<V, E>.bind(): V | ||
| } | ||
|
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| @PublishedApi | ||
| internal class CoroutineBindingScopeImpl<E>( | ||
| delegate: CoroutineScope, | ||
| ) : CoroutineBindingScope<E>, CoroutineScope by delegate { | ||
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| private val mutex = Mutex() | ||
| var result: Result<Nothing, E>? = null | ||
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| override suspend fun <V> Result<V, E>.bind(): V { | ||
| return when (this) { | ||
| is Ok -> value | ||
| is Err -> mutex.withLock { | ||
| if (result == null) { | ||
| result = this | ||
| coroutineContext.cancel(BindCancellationException) | ||
| } | ||
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| throw BindCancellationException | ||
| } | ||
| } | ||
| } | ||
| } |
74 changes: 10 additions & 64 deletions
74
.../commonMain/kotlin/com/github/michaelbull/result/coroutines/binding/SuspendableBinding.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,76 +1,22 @@ | ||
| package com.github.michaelbull.result.coroutines.binding | ||
|
|
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| import com.github.michaelbull.result.Err | ||
| import com.github.michaelbull.result.Ok | ||
| import com.github.michaelbull.result.Result | ||
| import kotlinx.coroutines.CancellationException | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.Job | ||
| import kotlinx.coroutines.cancel | ||
| import kotlinx.coroutines.coroutineScope | ||
| import kotlinx.coroutines.sync.Mutex | ||
| import kotlinx.coroutines.sync.withLock | ||
| import kotlin.contracts.InvocationKind | ||
| import kotlin.contracts.contract | ||
| import kotlin.coroutines.CoroutineContext | ||
| import com.github.michaelbull.result.coroutines.CoroutineBindingScope | ||
| import com.github.michaelbull.result.coroutines.coroutineBinding | ||
|
|
||
| /** | ||
| * Suspending variant of [binding][com.github.michaelbull.result.binding]. | ||
| * The suspendable [block] runs in a new [CoroutineScope], inheriting the parent [CoroutineContext]. | ||
| * This new scope is [cancelled][CoroutineScope.cancel] once a failing bind is encountered, eagerly cancelling all | ||
| * child [jobs][Job]. | ||
| */ | ||
| @Deprecated( | ||
| message = "Use coroutineBinding instead", | ||
| replaceWith = ReplaceWith( | ||
| expression = "coroutineBinding(block)", | ||
| imports = ["com.github.michaelbull.result.coroutines.coroutineBinding"] | ||
| ) | ||
| ) | ||
| public suspend inline fun <V, E> binding(crossinline block: suspend CoroutineBindingScope<E>.() -> V): Result<V, E> { | ||
| contract { | ||
| callsInPlace(block, InvocationKind.EXACTLY_ONCE) | ||
| } | ||
|
|
||
| lateinit var receiver: CoroutineBindingScopeImpl<E> | ||
|
|
||
| return try { | ||
| coroutineScope { | ||
| receiver = CoroutineBindingScopeImpl(this) | ||
|
|
||
| with(receiver) { | ||
| Ok(block()) | ||
| } | ||
| } | ||
| } catch (ex: BindCancellationException) { | ||
| receiver.result!! | ||
| } | ||
| return coroutineBinding(block) | ||
| } | ||
|
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| internal object BindCancellationException : CancellationException(null as String?) | ||
|
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| @Deprecated( | ||
| message = "Use CoroutineBindingScope instead", | ||
| replaceWith = ReplaceWith("CoroutineBindingScope<E>") | ||
| ) | ||
| public typealias SuspendableResultBinding<E> = CoroutineBindingScope<E> | ||
|
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| public interface CoroutineBindingScope<E> : CoroutineScope { | ||
| public suspend fun <V> Result<V, E>.bind(): V | ||
| } | ||
|
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||
| @PublishedApi | ||
| internal class CoroutineBindingScopeImpl<E>( | ||
| delegate: CoroutineScope, | ||
| ) : CoroutineBindingScope<E>, CoroutineScope by delegate { | ||
|
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| private val mutex = Mutex() | ||
| var result: Result<Nothing, E>? = null | ||
|
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| override suspend fun <V> Result<V, E>.bind(): V { | ||
| return when (this) { | ||
| is Ok -> value | ||
| is Err -> mutex.withLock { | ||
| if (result == null) { | ||
| result = this | ||
| coroutineContext.cancel(BindCancellationException) | ||
| } | ||
|
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| throw BindCancellationException | ||
| } | ||
| } | ||
| } | ||
| } |
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