private void SendItem(ReceiveSendItem item)
{
SocketAsyncEventArgs args = cache.PopOrCreate();
args.Completed += Send_Completed;
SendItem(item, args);
}
private void ReceiveItem(ReceiveSendItem item, SocketAsyncEventArgs args)
{
args.UserToken = item;
if (!socket.ReceiveAsync(args))
{
Receive_Completed(socket, args);
}
}
private void SendItem(ReceiveSendItem item, SocketAsyncEventArgs args)
{
args.UserToken = item;
int cplen = Math.Min(args.Count, item.Count);
Array.Copy(item.Buffer, item.Offset, args.Buffer, args.Offset, cplen);
args.SetBuffer(args.Offset, cplen);
if (!socket.SendAsync(args))
{
Send_Completed(socket, args);
}
}
private bool TryDequeue(out ReceiveSendItem item)
{
if (realtimeQueue.TryDequeue(out item))
{
return(true);
}
if (backgroundQueue.TryDequeue(out item))
{
return(true);
}
return(false);
}
private void Receive_Completed(object sender, SocketAsyncEventArgs e)
{
ReceiveSendItem item = (ReceiveSendItem)e.UserToken;
if (e.SocketError == SocketError.Shutdown || e.SocketError == SocketError.OperationAborted)
{
item.Tcs.SetResult(false);
RecycleReceive(e);
return;
}
else if (e.SocketError != SocketError.Success)
{
item.Tcs.SetResult(false);
RecycleReceive(e);
exhandler.CloseConnection(e.SocketError, e.LastOperation);
return;
}
if (e.BytesTransferred == 0)
{
item.Tcs.SetResult(false);
RecycleReceive(e);
exhandler.CloseConnection(SocketError.Disconnecting, e.LastOperation);
return;
}
ReceivedBytes += e.BytesTransferred; // for statistics
int cplen = Math.Min(e.BytesTransferred, item.Count);
Array.Copy(e.Buffer, e.Offset, item.Buffer, item.Offset, cplen);
item.Offset += cplen;
item.Count -= cplen;
if (item.Count > 0)
{
ReceiveItem(item, e);
}
else if (e.BytesTransferred - cplen > 0)
{
e.SetBuffer(e.Offset + cplen, e.BytesTransferred - cplen);
receiveCache = e;
item.Tcs.SetResult(true);
// Do not recycle this item now when we cache its buffer
}
else
{
item.Tcs.SetResult(true);
RecycleReceive(e);
}
}
private void Send_Completed(object sender, SocketAsyncEventArgs e)
{
ReceiveSendItem item = (ReceiveSendItem)e.UserToken;
if (e.SocketError == SocketError.Shutdown)
{
item.Tcs.SetResult(false);
RecycleSend(e);
return;
}
else if (e.SocketError != SocketError.Success)
{
item.Tcs.SetResult(false);
exhandler.CloseConnection(e.SocketError, e.LastOperation);
RecycleSend(e);
return;
}
if (e.BytesTransferred == 0)
{
item.Tcs.SetResult(false);
exhandler.CloseConnection(SocketError.ConnectionReset, e.LastOperation);
RecycleSend(e);
return;
}
SentBytes += e.BytesTransferred; // for statistics
item.Offset += e.BytesTransferred;
item.Count -= e.BytesTransferred;
if (item.Count > 0)
{
SendItem(item, e);
}
else
{
item.Tcs.SetResult(true);
RecycleSend(e);
StartSend(locked: false);
}
}
/// <summary>
/// Sends data to the remote host asynchronously.
/// </summary>
/// <exception cref="ObjectDisposedException" />
public Task <bool> SendAsync(byte[] buffer, int offset, int count, bool background)
{
if (disposed)
{
throw new ObjectDisposedException(GetType().FullName);
}
if (shutdown)
{
return(Task.FromResult(false));
}
ReceiveSendItem item = new ReceiveSendItem(buffer, offset, count);
if (background)
{
backgroundQueue.Enqueue(item);
}
else
{
realtimeQueue.Enqueue(item);
}
EnsureSend();
return(item.Task);
}
/// <summary>
/// Receives the specified count of bytes from the remote host asynchronously. This method is not threadsafe!
/// </summary>
/// <exception cref="ObjectDisposedException" />
public Task <bool> ReceiveAsync(byte[] buffer, int offset, int count)
{
if (disposed)
{
throw new ObjectDisposedException(GetType().FullName);
}
if (shutdown)
{
return(Task.FromResult(false));
}
if (receiveCache != null)
{
int cplen = Math.Min(receiveCache.Count, count);
Array.Copy(receiveCache.Buffer, receiveCache.Offset, buffer, offset, cplen);
receiveCache.SetBuffer(receiveCache.Offset + cplen, receiveCache.Count - cplen);
offset += cplen;
count -= cplen;
if (receiveCache.Count == 0)
{
RecycleReceive(receiveCache);
receiveCache = null;
}
}
if (count > 0)
{
ReceiveSendItem item = new ReceiveSendItem(buffer, offset, count);
ReceiveItem(item);
return(item.Task);
}
else
{
return(Task.FromResult(true));
}
}
