wehub-resource-sync
117 lines
4.1 KiB
C#
117 lines
4.1 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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using System.Collections.Generic;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// Helper class to synchronize execution based on a string key
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/// </summary>
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public class KeyStringSynchronizer
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{
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private readonly Dictionary<string, string> _currentStrings = new ();
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/// <summary>
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/// Execute the given action synchronously with any other thread using the same key
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/// </summary>
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/// <param name="key">The synchronization key</param>
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/// <param name="singleExecution">True if execution should happen only once at the same time for multiple threads</param>
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/// <param name="action">The action to execute</param>
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public void Execute(string key, bool singleExecution, Action action)
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{
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ExecuteImplementation(key, singleExecution, action);
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}
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/// <summary>
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/// Execute the given function synchronously with any other thread using the same key
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/// </summary>
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/// <param name="key">The synchronization key</param>
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/// <param name="action">The function to execute</param>
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public T Execute<T>(string key, Func<T> action)
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{
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T result = default;
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ExecuteImplementation(key, singleExecution: false, () =>
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{
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result = action();
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});
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return result;
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}
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private void ExecuteImplementation(string key, bool singleExecution, Action action)
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{
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lock (key)
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{
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while (true)
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{
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bool lockTaken = false;
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string existingKey;
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lock (_currentStrings)
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{
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if(!_currentStrings.TryGetValue(key, out existingKey))
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{
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_currentStrings[key] = existingKey = key;
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}
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}
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try
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{
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lockTaken = Monitor.TryEnter(existingKey);
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// this way we can handle reentry with no issues
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if (lockTaken)
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{
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try
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{
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// happy case
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action();
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return;
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}
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finally
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{
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lock (_currentStrings)
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{
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// even if we fail we need to release it
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_currentStrings.Remove(key);
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}
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}
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}
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}
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finally
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{
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if (lockTaken)
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{
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Monitor.Exit(existingKey);
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}
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}
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lock (existingKey)
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{
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// if we are here the thread that had the lock finished
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if (!singleExecution)
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{
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// time to try again!
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continue;
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}
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return;
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}
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}
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}
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}
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}
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}
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