wehub-resource-sync
113 lines
4.0 KiB
C#
113 lines
4.0 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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using System;
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using System.Collections.Concurrent;
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using System.Threading;
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using QuantConnect.Logging;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// This worker tread is required to guarantee all python operations are
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/// executed by the same thread, to enable complete debugging functionality.
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/// We don't use the main thread, to avoid any chance of blocking the process
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/// </summary>
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public class WorkerThread : IDisposable
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{
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private readonly BlockingCollection<Action> _blockingCollection;
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private readonly CancellationTokenSource _threadCancellationTokenSource;
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private readonly Thread _workerThread;
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/// <summary>
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/// The worker thread instance
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/// </summary>
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public static WorkerThread Instance = new WorkerThread();
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/// <summary>
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/// Will be set when the worker thread finishes a work item
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/// </summary>
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public AutoResetEvent FinishedWorkItem { get; }
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/// <summary>
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/// Creates a new instance, which internally launches a new worker thread
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/// </summary>
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/// <remarks><see cref="Dispose"/></remarks>
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protected WorkerThread()
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{
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_threadCancellationTokenSource = new CancellationTokenSource();
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FinishedWorkItem = new AutoResetEvent(false);
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_blockingCollection = new BlockingCollection<Action>();
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_workerThread = new Thread(() =>
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{
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try
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{
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foreach (var action in _blockingCollection.GetConsumingEnumerable(_threadCancellationTokenSource.Token))
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{
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FinishedWorkItem.Reset();
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try
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{
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action();
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}
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catch (Exception exception)
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{
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Log.Error(exception, "WorkerThread(): exception thrown when running task");
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}
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FinishedWorkItem.Set();
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}
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}
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catch (OperationCanceledException)
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{
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// pass, when the token gets cancelled
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}
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})
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{
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IsBackground = true,
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Name = "Isolator Thread",
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Priority = ThreadPriority.Highest
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};
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_workerThread.Start();
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}
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/// <summary>
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/// Adds a new item of work
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/// </summary>
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/// <param name="action">The work item to add</param>
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public void Add(Action action)
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{
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_blockingCollection.Add(action);
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}
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/// <summary>
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/// Disposes the worker thread.
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/// </summary>
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/// <remarks>Note that the worker thread is a background thread,
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/// so it won't block the process from terminating even if not disposed</remarks>
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public virtual void Dispose()
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{
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try
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{
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_blockingCollection.CompleteAdding();
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_workerThread.StopSafely(TimeSpan.FromMilliseconds(50), _threadCancellationTokenSource);
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_threadCancellationTokenSource.DisposeSafely();
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}
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catch (Exception exception)
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{
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Log.Error(exception);
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}
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}
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}
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}
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