wehub-resource-sync
108 lines
3.9 KiB
C#
108 lines
3.9 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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using System;
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using System.Threading;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// Provides extension methods to make working with the <see cref="ReaderWriterLockSlim"/> class easier
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/// </summary>
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public static class ReaderWriterLockSlimExtensions
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{
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/// <summary>
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/// Opens the read lock
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/// </summary>
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/// <param name="readerWriterLockSlim">The lock to open for read</param>
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/// <returns>A disposable reference which will release the lock upon disposal</returns>
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public static IDisposable Read(this ReaderWriterLockSlim readerWriterLockSlim)
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{
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return new ReaderLockToken(readerWriterLockSlim);
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}
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/// <summary>
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/// Opens the write lock
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/// </summary>
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/// <param name="readerWriterLockSlim">The lock to open for write</param>
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/// <returns>A disposale reference which will release thelock upon disposal</returns>
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public static IDisposable Write(this ReaderWriterLockSlim readerWriterLockSlim)
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{
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return new WriteLockToken(readerWriterLockSlim);
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}
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private sealed class ReaderLockToken : ReaderWriterLockSlimToken
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{
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public ReaderLockToken(ReaderWriterLockSlim readerWriterLockSlim)
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: base(readerWriterLockSlim)
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{
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}
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protected override void EnterLock(ReaderWriterLockSlim readerWriterLockSlim)
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{
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readerWriterLockSlim.EnterReadLock();
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}
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protected override void ExitLock(ReaderWriterLockSlim readerWriterLockSlim)
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{
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readerWriterLockSlim.ExitReadLock();
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}
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}
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private sealed class WriteLockToken : ReaderWriterLockSlimToken
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{
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public WriteLockToken(ReaderWriterLockSlim readerWriterLockSlim)
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: base(readerWriterLockSlim)
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{
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}
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protected override void EnterLock(ReaderWriterLockSlim readerWriterLockSlim)
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{
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readerWriterLockSlim.EnterWriteLock();
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}
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protected override void ExitLock(ReaderWriterLockSlim readerWriterLockSlim)
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{
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readerWriterLockSlim.ExitWriteLock();
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}
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}
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private abstract class ReaderWriterLockSlimToken : IDisposable
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{
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private ReaderWriterLockSlim _readerWriterLockSlim;
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public ReaderWriterLockSlimToken(ReaderWriterLockSlim readerWriterLockSlim)
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{
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_readerWriterLockSlim = readerWriterLockSlim;
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// ReSharper disable once DoNotCallOverridableMethodsInConstructor -- we control the subclasses, this is fine
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EnterLock(_readerWriterLockSlim);
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}
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protected abstract void EnterLock(ReaderWriterLockSlim readerWriterLockSlim);
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protected abstract void ExitLock(ReaderWriterLockSlim readerWriterLockSlim);
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public void Dispose()
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{
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if (_readerWriterLockSlim != null)
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{
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ExitLock(_readerWriterLockSlim);
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_readerWriterLockSlim = null;
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}
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}
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}
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}
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}
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