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Merge pull request #1681 from danielmarbach/reset-event
Async flow control
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155 changes: 155 additions & 0 deletions
155
projects/RabbitMQ.Client/client/impl/AsyncManualResetEvent.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| // This source code is dual-licensed under the Apache License, version | ||
| // 2.0, and the Mozilla Public License, version 2.0. | ||
| // | ||
| // The APL v2.0: | ||
| // | ||
| //--------------------------------------------------------------------------- | ||
| // Copyright (c) 2007-2024 Broadcom. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| //--------------------------------------------------------------------------- | ||
| // | ||
| // The MPL v2.0: | ||
| // | ||
| //--------------------------------------------------------------------------- | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at https://mozilla.org/MPL/2.0/. | ||
| // | ||
| // Copyright (c) 2007-2024 Broadcom. All Rights Reserved. | ||
| //--------------------------------------------------------------------------- | ||
|
|
||
| using System; | ||
| using System.Diagnostics.CodeAnalysis; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using System.Threading.Tasks.Sources; | ||
|
|
||
| namespace RabbitMQ.Client.client.impl | ||
| { | ||
| sealed class AsyncManualResetEvent : IValueTaskSource | ||
| { | ||
| private ManualResetValueTaskSourceCore<bool> _valueTaskSource; | ||
| private bool _isSet; | ||
|
|
||
| public AsyncManualResetEvent(bool initialState = false) | ||
| { | ||
| _isSet = initialState; | ||
| _valueTaskSource.Reset(); | ||
| if (initialState) | ||
| { | ||
| _valueTaskSource.SetResult(true); | ||
| } | ||
| } | ||
|
|
||
| public bool IsSet => Volatile.Read(ref _isSet); | ||
|
|
||
| public async ValueTask WaitAsync(CancellationToken cancellationToken) | ||
| { | ||
| if (IsSet) | ||
| { | ||
| return; | ||
| } | ||
|
|
||
| cancellationToken.ThrowIfCancellationRequested(); | ||
|
|
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| CancellationTokenRegistration tokenRegistration = | ||
| #if NET6_0_OR_GREATER | ||
| cancellationToken.UnsafeRegister( | ||
| static state => | ||
| { | ||
| var (source, token) = ((ManualResetValueTaskSourceCore<bool>, CancellationToken))state!; | ||
| source.SetException(new OperationCanceledException(token)); | ||
| }, (_valueTaskSource, cancellationToken)); | ||
| #else | ||
| cancellationToken.Register( | ||
| static state => | ||
| { | ||
| var (source, token) = ((ManualResetValueTaskSourceCore<bool>, CancellationToken))state!; | ||
| source.SetException(new OperationCanceledException(token)); | ||
| }, | ||
| state: (_valueTaskSource, cancellationToken), useSynchronizationContext: false); | ||
| #endif | ||
| try | ||
| { | ||
| await new ValueTask(this, _valueTaskSource.Version) | ||
| .ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| #if NET6_0_OR_GREATER | ||
| await tokenRegistration.DisposeAsync() | ||
| .ConfigureAwait(false); | ||
| #else | ||
| tokenRegistration.Dispose(); | ||
| #endif | ||
| } | ||
| } | ||
|
|
||
| public void Set() | ||
| { | ||
| if (IsSet) | ||
| { | ||
| return; | ||
| } | ||
|
|
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| Volatile.Write(ref _isSet, true); | ||
| _valueTaskSource.SetResult(true); | ||
| } | ||
|
|
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| public void Reset() | ||
| { | ||
| if (!IsSet) | ||
| { | ||
| return; | ||
| } | ||
|
|
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| Volatile.Write(ref _isSet, false); | ||
| _valueTaskSource.Reset(); | ||
| } | ||
|
|
||
| void IValueTaskSource.GetResult(short token) | ||
| { | ||
| if (token != _valueTaskSource.Version) | ||
| { | ||
| ThrowIncorrectTokenException(); | ||
| } | ||
|
|
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| _valueTaskSource.GetResult(token); | ||
| } | ||
|
|
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| ValueTaskSourceStatus IValueTaskSource.GetStatus(short token) | ||
| { | ||
| if (token != _valueTaskSource.Version) | ||
| { | ||
| ThrowIncorrectTokenException(); | ||
| } | ||
|
|
||
| return _valueTaskSource.GetStatus(token); | ||
| } | ||
|
|
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| void IValueTaskSource.OnCompleted(Action<object?> continuation, object? state, short token, ValueTaskSourceOnCompletedFlags flags) | ||
| { | ||
| if (token != _valueTaskSource.Version) | ||
| { | ||
| ThrowIncorrectTokenException(); | ||
| } | ||
|
|
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| _valueTaskSource.OnCompleted(continuation, state, token, flags); | ||
| } | ||
|
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| [DoesNotReturn] | ||
| static void ThrowIncorrectTokenException() => | ||
| throw new InvalidOperationException("ValueTask cannot be awaited multiple times."); | ||
| } | ||
| } |
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