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186 lines
6.3 KiB
186 lines
6.3 KiB
using System;
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using System.Collections.Generic;
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using System.Collections.Concurrent;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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namespace IPA.Utilities.Async
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{
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/// <summary>
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/// A single-threaded task scheduler that runs all of its tasks on the same thread.
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/// </summary>
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public class SingleThreadTaskScheduler : TaskScheduler, IDisposable
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{
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private readonly Thread runThread = new Thread(ExecuteTasksS);
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private readonly BlockingCollection<Task> tasks = new BlockingCollection<Task>();
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private readonly CancellationTokenSource exitTokenSource = new CancellationTokenSource();
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/// <summary>
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/// Gets whether or not the underlying thread has been started.
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/// </summary>
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/// <exception cref="InvalidOperationException">Thrown if this object has already been disposed.</exception>
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public bool IsRunning
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{
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get
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{
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ThrowIfDisposed();
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return runThread.IsAlive;
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}
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}
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/// <summary>
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/// Starts the thread that executes tasks scheduled with this <see cref="TaskScheduler"/>
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/// </summary>
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/// <exception cref="InvalidOperationException">Thrown if this object has already been disposed.</exception>
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public void Start()
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{
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ThrowIfDisposed();
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runThread.Start(this);
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}
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/// <summary>
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/// Terminates the runner thread, and waits for the currently running task to complete.
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/// </summary>
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/// <remarks>
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/// After this method returns, this object has been disposed and is no longer in a valid state.
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/// </remarks>
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/// <returns>an <see cref="IEnumerable{T}"/> of <see cref="Task"/>s that did not execute</returns>
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/// <exception cref="InvalidOperationException">Thrown if this object has already been disposed.</exception>
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public IEnumerable<Task> Exit()
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{
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ThrowIfDisposed();
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tasks.CompleteAdding();
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exitTokenSource.Cancel();
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runThread.Join();
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var retTasks = new List<Task>();
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retTasks.AddRange(tasks);
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return retTasks;
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}
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/// <summary>
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/// Waits for the runner thread to complete all tasks in the queue, then exits.
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/// </summary>
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/// <remarks>
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/// After this method returns, this object has been disposed and is no longer in a valid state.
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/// </remarks>
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/// <exception cref="InvalidOperationException">Thrown if this object has already been disposed.</exception>
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public void Join()
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{
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ThrowIfDisposed();
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tasks.CompleteAdding();
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runThread.Join();
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}
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/// <summary>
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/// Throws a <see cref="NotSupportedException"/>.
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/// </summary>
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/// <returns>nothing</returns>
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/// <exception cref="NotSupportedException">Always.</exception>
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protected override IEnumerable<Task> GetScheduledTasks()
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{
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// this is only for debuggers which we can't use sooooo
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throw new NotSupportedException();
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}
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/// <summary>
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/// Queues a given <see cref="Task"/> to this scheduler. The <see cref="Task"/> <i>must></i> be
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/// scheduled for this <see cref="TaskScheduler"/> by the runtime.
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/// </summary>
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/// <param name="task">the <see cref="Task"/> to queue</param>
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/// <exception cref="InvalidOperationException">Thrown if this object has already been disposed.</exception>
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protected override void QueueTask(Task task)
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{
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ThrowIfDisposed();
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tasks.Add(task);
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}
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/// <summary>
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/// Rejects any attempts to execute a task inline.
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/// </summary>
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/// <remarks>
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/// This task scheduler <i>always</i> runs its tasks on the thread that it manages, therefore it doesn't
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/// make sense to run it inline.
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/// </remarks>
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/// <param name="task">the task to attempt to execute</param>
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/// <param name="taskWasPreviouslyQueued">whether the task was previously queued to this scheduler</param>
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/// <returns><see langword="false"/></returns>
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/// <exception cref="InvalidOperationException">Thrown if this object has already been disposed.</exception>
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protected override bool TryExecuteTaskInline(Task task, bool taskWasPreviouslyQueued)
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{
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ThrowIfDisposed();
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return false;
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}
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private void ThrowIfDisposed()
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{
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if (disposedValue)
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throw new InvalidOperationException("Object already disposed");
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}
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private void ExecuteTasks()
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{
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ThrowIfDisposed();
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var token = exitTokenSource.Token;
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try
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{
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// while we are still accepting tasks, and we can pull out a task with an infinite wait duration
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while (!tasks.IsCompleted && tasks.TryTake(out var task, -1, token))
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{
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TryExecuteTask(task);
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}
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}
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catch (OperationCanceledException)
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{
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// TryTake was cancelled, we'll just leave
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}
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}
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private static void ExecuteTasksS(object param)
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{
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var self = param as SingleThreadTaskScheduler;
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self.ExecuteTasks();
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}
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#region IDisposable Support
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private bool disposedValue = false; // To detect redundant calls
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/// <summary>
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/// Disposes this object.
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/// </summary>
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/// <param name="disposing">whether or not to dispose managed objects</param>
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protected virtual void Dispose(bool disposing)
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{
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if (!disposedValue)
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{
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if (disposing)
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{
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exitTokenSource.Dispose();
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tasks.Dispose();
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}
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disposedValue = true;
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}
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}
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/// <summary>
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/// Disposes this object. This puts the object into an unusable state.
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/// </summary>
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public void Dispose()
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{
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// Do not change this code. Put cleanup code in Dispose(bool disposing) above.
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Dispose(true);
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}
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#endregion
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}
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}
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