private static List <Task> StartClients()
{
Byte[] msgOut = Encoding.UTF8.GetBytes(_message);
ArraySegment <Byte> segmentOut = new ArraySegment <Byte>(msgOut, 0, msgOut.Length);
SendingStragegy sendingStrategy = _messageLength == _frameLength ?
(SendingStragegy) new SingleFrameSendingStrategy(segmentOut) :
(SendingStragegy) new MultiFrameSendingStrategy(_frameLength, segmentOut);
Random ran = new Random(DateTime.Now.Millisecond);
return(Enumerable.Range(0, _amount)
.Select(i => Task.Run(() => StartClient(ran, _cancellation.Token, sendingStrategy)))
.ToList());
}
private static async Task StartClient(Random ran, CancellationToken cancel, SendingStragegy strategy)
{
Byte[] msgIn = new Byte[4096];
ArraySegment <Byte> segmentIn = new ArraySegment <Byte>(msgIn, 0, msgIn.Length);
while (!cancel.IsCancellationRequested)
{
await Task.Delay(ran.Next(0, 450), cancel).ConfigureAwait(false);
ClientWebSocket client = new ClientWebSocket();
try
{
await client.ConnectAsync(_host, cancel).ConfigureAwait(false);
Console.Write("·");
PerformanceCountersHelper.Connected.Increment();
Stopwatch stopwatch = new Stopwatch();
while (!cancel.IsCancellationRequested)
{
stopwatch.Start();
await strategy.Send(client, cancel).ConfigureAwait(false);
String message = null;
WebSocketReceiveResult result = await client.ReceiveAsync(segmentIn, cancel).ConfigureAwait(false);
// it could be more compact, but this way avoids creating the stream until the await returns with an actual response
using (var ms = new MemoryStream())
{
ms.Write(segmentIn.Array, segmentIn.Offset, result.Count);
while (!result.EndOfMessage)
{
result = await client.ReceiveAsync(segmentIn, cancel).ConfigureAwait(false);
ms.Write(segmentIn.Array, segmentIn.Offset, result.Count);
}
stopwatch.Stop();
var array = ms.ToArray();
message = Encoding.UTF8.GetString(array, 0, array.Length);
}
if (!String.IsNullOrEmpty(message) && !message.Equals(_message, StringComparison.Ordinal))
{
throw new Exception("Response is different from request, sent: " + _frameLength + ", received: " + (message == null ? 0 : message.Length).ToString());
}
PerformanceCountersHelper.EchoLatency.IncrementBy(stopwatch.ElapsedTicks);
PerformanceCountersHelper.EchoLatencyBase.IncrementBy(1);
PerformanceCountersHelper.EchoCount.Increment();
if (_delay != 0)
{
await Task.Delay(_delay, cancel).ConfigureAwait(false);
}
stopwatch.Reset();
}
}
catch (OperationCanceledException)
{
}
catch (Exception ex)
{
ShowException(ex);
_cancellation.Cancel();
}
finally
{
PerformanceCountersHelper.Connected.Decrement();
Console.Write("~");
client.Dispose();
}
}
}