public async Task CanReadDataInParallel()
{
var longString = string.Concat(Enumerable.Repeat(@"
Let me explain something to you. Um, I am not ""Mr.Lebowski"".
You're Mr. Lebowski. I'm the Dude.
So that's what you call me.
You know, that or, uh, His Dudeness, or uh, Duder, or El Duderino if you're not into the whole brevity thing.
", 100));
const string dataId = "known-id";
using (var source = new MemoryStream(Encoding.UTF8.GetBytes(longString)))
{
await _storage.Save(dataId, source);
}
var caughtExceptions = new ConcurrentQueue <Exception>();
Console.WriteLine("Reading the data many times in parallel");
var threads = Enumerable.Range(0, 10)
.Select(i =>
{
var thread = new Thread(() =>
{
100.Times(() =>
{
Console.Write(".");
try
{
using var source = _storage.Read(dataId).Result;
using var destination = new MemoryStream();
source.CopyTo(destination);
}
catch (Exception exception)
{
caughtExceptions.Enqueue(exception);
}
});
});
return(thread);
})
.ToList();
Console.WriteLine("Starting threads");
threads.ForEach(t => t.Start());
Console.WriteLine("Waiting for them to finish");
threads.ForEach(t => t.Join());
Console.WriteLine("Finished :)");
if (caughtExceptions.Count > 0)
{
Assert.Fail($@"Caught {caughtExceptions.Count} exceptions - here's the first 5:
{string.Join(Environment.NewLine + Environment.NewLine, caughtExceptions.Take(5))}");
}
}
