public async ValueTask TestSwitch1()
{
for (var i = 0; i < 100; i++)
{
await AsTask.ToBackgroundContext();
}
}
public async Task TestToBackgroundContext()
{
await AsTask.ToBackgroundContext();
Console.WriteLine(AsTask.WhereAmI());
Assert.True(AsTask.IsBackgroundContext(), "This is not the BackgroundContext!");
}
public async ValueTask TestBc2()
{
await AsTask.ToBackgroundContext();
await Task.Delay(10);
await Task.Yield();
}
public async Task TestAwaitPost()
{
await AsTask.ToMainContext();
var stopwatch = Stopwatch.StartNew();
await AsTask.ToBackgroundContext(() => Thread.Sleep(1000));
stopwatch.Stop();
Console.WriteLine($"{nameof(stopwatch)} {stopwatch.ElapsedMilliseconds}ms == {AsTask.GetCurrentContextType()} awaiter 1000ms");
Assert.True(stopwatch.ElapsedMilliseconds >= 1000);
}
public async ValueTask TestSwitch4()
{
for (var i = 0; i < 100; i++)
{
await AsTask.ToBackgroundContext();
await AsTask.ToStaticThreadPool();
await AsTask.ToDynamicThreadPool();
}
}
public async Task TestDelayAwaiterBackgroundContext()
{
await AsTask.ToBackgroundContext();
var stopwatch = Stopwatch.StartNew();
await Task.Delay(100);
stopwatch.Stop();
Assert.True(AsTask.IsBackgroundContext(), $"This is not the BackgroundContext: {AsTask.WhereAmI()}");
Console.WriteLine($"{nameof(stopwatch)} {stopwatch.ElapsedMilliseconds}ms == {AsTask.GetCurrentContextType()} awaiter 100ms");
Assert.True(stopwatch.ElapsedMilliseconds >= 80 && stopwatch.ElapsedMilliseconds <= 150);
}
public async Task TestExceptions1()
{
for (var i = 0; i < 5; i++)
{
try
{
await Exceptions(i);
}
catch (Exception)
{
Console.WriteLine($"Catch exception[{i}]");
}
}
async Task Exceptions(int idx)
{
switch (idx)
{
case 0:
await AsTask.ToMainContext();
throw new ApplicationException("ToMainContext");
case 1:
await AsTask.ToBackgroundContext();
throw new ApplicationException("ToBackgroundContext");
case 2:
await AsTask.ToContext(_contextTests2Id);
throw new ApplicationException("ToContext");
case 3:
await AsTask.ToStaticThreadPool();
throw new ApplicationException("ToStaticThreadPool");
case 4:
await AsTask.ToDynamicThreadPool();
throw new ApplicationException("ToDynamicThreadPool");
}
}
}
public async Task TestSwitchingToContexts()
{
await AsTask.ToBackgroundContext();
Assert.True(AsTask.GetCurrentContextType() == ThreadContextType.ThreadContext);
await AsTask.ToContext(_contextTests1Id);
Assert.True(AsTask.GetCurrentContextType() == ThreadContextType.ThreadContext);
await AsTask.ToStaticThreadPool();
Assert.True(AsTask.GetCurrentContextType() == ThreadContextType.StaticThreadPool);
await AsTask.ToDynamicThreadPool();
Assert.True(AsTask.GetCurrentContextType() == ThreadContextType.DynamicThreadPool);
}
public async Task TestMoreSwitching()
{
for (var i = 0; i < 1000; i++)
{
await TestSwitchingToContexts();
}
for (var i = 0; i < 1000; i++)
{
await AsTask.ToMainContext();
Assert.True(AsTask.IsMainContext());
}
for (var i = 0; i < 1000; i++)
{
await AsTask.ToBackgroundContext();
Assert.True(AsTask.IsBackgroundContext());
}
for (var i = 0; i < 1000; i++)
{
await AsTask.ToContext(_contextTests1Id);
Assert.True(AsTask.IsThreadContext(_contextTests1Id));
}
for (var i = 0; i < 1000; i++)
{
await AsTask.ToStaticThreadPool();
Assert.True(AsTask.IsStaticThreadPool());
}
for (var i = 0; i < 1000; i++)
{
await AsTask.ToDynamicThreadPool();
Assert.True(AsTask.IsDynamicThreadPool());
}
}
public async ValueTask TestBc1()
{
await AsTask.ToBackgroundContext(() => Thread.Sleep(10));
await Task.Yield();
}
private static async Task Main()
{
WriteLine("Assign an exception handler.");
TaskExceptionHandler.SetExceptionHandler(task =>
{
Error.WriteLine(task.Exception != null
? $"[ExceptionHandler] {task.Exception.GetBaseException().Message}"
: $"[ExceptionHandler] Unhandled exception in task {task}");
});
WriteLine("We get or create a synchronization context and switch to it.");
await AsTask.Initialize();
WriteLine($"Print to the console information about the current context: {AsTask.WhereAmI()}");
WriteLine("Switch to the background context.");
await AsTask.ToBackgroundContext();
WriteLine($"Now we get information about the context of the background context: {AsTask.WhereAmI()}");
WriteLine("Back switch to the main context.");
await AsTask.ToMainContext();
WriteLine("We call the asynchronous methods, which performs the heavy work...");
var tasks = new List <Task <long> >();
for (var i = 1; i <= 10; i++)
{
tasks.Add(FindPrimeNumberAsync(20000 * i));
}
WriteLine("Asynchronously waiting for the execution of tasks.");
_ = Task.WhenAll(tasks).ContinueWith(async task =>
{
await AsTask.ToMainContext();
WriteLine("This is the result of our calculations:");
foreach (var val in task.Result)
{
WriteLine(val);
}
Shutdown();
}).ExceptionHandler();
if (AsTask.IsMainContext())
{
WriteLine("hmm, we're still in the main context!:)");
}
WriteLine("The life cycle of a console application runs on the main context.");
var scheduler = AsTask.GetStaticTaskScheduler();
while (!_isShutdown)
{
WriteLine($"Count running tasks: {scheduler.CountExecutableTasks}; Count tasks in queue: {scheduler.CountTasksInQueue}");
await Task.Delay(1000); // Each iteration waits asynchronously for 1000 ms
}
WriteLine("Shutdown...");
for (var i = 5; i > 0; i--)
{
WriteLine($"Shutdown through {i}s");
await Task.Delay(1000);
}
}