// Performs a single blocking read to the netstack, and adds data
// to dataBuffer.
// Returns true if future read operations are permissible; false
// if the data stream has ended.
private bool BlockingRead(TcpConnectionContract /*.Imp*/ conn, TrackedBytesBuffer dataBuffer)
{
Bytes readData = conn.Read();
//case conn.Data(byte[] readData) :
if (readData != null)
{
// Tack this onto the data buffer. Data is consumed by AddToTail.
dataBuffer.AddToTail(readData);
return(true);
}
//case conn.NoMoreData() :
//case conn.ConnectionClosed() :
return(false);
}
// Reads as much as possible without blocking, tack it onto dataBuffer.
// We will block for a MAXIMUM of the time specified by "microSeconds".
// Returns true if future read operations are permissible, false if
// the data stream has ended
private bool DrainDataNonBlock(TcpConnectionContract /*.Imp*/ conn,
TrackedBytesBuffer dataBuffer,
int microSeconds)
{
bool keepTrying = true;
int timeToSleep = microSeconds;
while (keepTrying)
{
keepTrying = false; // defensive
Bytes readData = conn.PollRead(timeToSleep);
//case conn.Data(byte[] readData) :
if (readData != null && readData.Length > 0)
{
// Tack this onto the data buffer. Data is consumed by AddToTail()
dataBuffer.AddToTail(readData);
// Keep trying, but don't sleep. We do this strictly to
// drain off any additional data, since currently the
// netStack hands data to us in packet-sized chunks,
// which means it may have additional data ready if you
// ask it again.
keepTrying = true;
timeToSleep = 0;
continue;
}
//case conn.NoData() :
if (readData != null && readData.Length == 0)
{
// done
return(true);
}
//case conn.NoMoreData() :
//case conn.ConnectionClosed() :
if (readData == null)
{
return(false);
}
}
// Should never get here
return(true);
}