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//
// TestSingleThreadSynchronizationContext.cs
//
// Author:
// Marius Ungureanu <maungu@microsoft.com>
//
// Copyright (c) 2018 Microsoft Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections.Concurrent;
using System.Threading;
namespace UnitTests
{
/// <summary>
/// A <see cref="SynchronizationContext"/> that can be used to test whether actions happen on it.
/// </summary>
public class TestSingleThreadSynchronizationContext : SynchronizationContext, IDisposable
{
public int CallCount { get; private set; }
public Thread Thread { get; } = new Thread (ProcessQueue);
readonly BlockingCollection<Tuple<SendOrPostCallback, object, ManualResetEvent>> queue =
new BlockingCollection<Tuple<SendOrPostCallback, object, ManualResetEvent>> ();
public TestSingleThreadSynchronizationContext ()
{
Thread.Start (queue);
}
public void Dispose ()
{
queue.CompleteAdding ();
}
static void ProcessQueue (object state)
{
var queue = (BlockingCollection<Tuple<SendOrPostCallback, object, ManualResetEvent>>)state;
Tuple<SendOrPostCallback, object, ManualResetEvent> tuple;
while (queue.TryTake (out tuple, Timeout.Infinite)) {
tuple.Item1 (tuple.Item2);
tuple.Item3?.Set ();
}
}
public override void Send (SendOrPostCallback d, object state)
{
CallCount++;
var mre = new ManualResetEvent (false);
queue.Add (Tuple.Create (d, state, mre));
mre.WaitOne ();
}
public override void Post (SendOrPostCallback d, object state)
{
CallCount++;
queue.Add (Tuple.Create (d, state, default (ManualResetEvent)));
}
}
}
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