private void Worker()
{
ByteArrayWriter byteArrayWriter = (ByteArrayWriter)null;
while (!this._closing)
{
int bytesToRead = this.Port.BytesToRead;
if (bytesToRead > 0)
{
byte[] numArray = new byte[bytesToRead];
this.Port.Read(numArray, 0, bytesToRead);
this.Protocol.OnIncommingData(numArray);
if (byteArrayWriter == null)
{
byteArrayWriter = new ByteArrayWriter();
}
byteArrayWriter.WriteBytes(numArray, 0, bytesToRead);
ServerCommData data = new ServerCommData(this.Protocol);
data.IncomingData = byteArrayWriter.ToReader();
CommResponse commResponse = this.Protocol.Codec.ServerDecode((CommDataBase)data);
if (commResponse.Status == 3)
{
this.OnServeCommand(data);
this.Protocol.Codec.ServerEncode((CommDataBase)data);
byte[] array = data.OutgoingData.ToArray();
this.Port.Write(array, 0, array.Length);
this.Protocol.OnOutgoingData(array);
byteArrayWriter = (ByteArrayWriter)null;
}
else if (commResponse.Status == 1)
{
byteArrayWriter = (ByteArrayWriter)null;
}
}
Thread.Sleep(100);
}
}
/// <summary>
/// Entry-point for submitting a query to the remote device
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public CommResponse Query(ClientCommData data)
{
lock (Port)
{
//convert the request data as an ordinary byte array
byte[] outgoing = data
.OutgoingData
.ToArray();
//create a writer for accumulate the incoming data
var incoming = new ByteArrayWriter();
const int tempSize = 256;
var temp = new byte[tempSize];
//retries loop
for (int attempt = 0, retries = data.Retries; attempt < retries; attempt++)
{
//flush any residual content
Port
.DiscardInBuffer();
Port
.DiscardOutBuffer();
//phyiscal writing
Port
.Write(outgoing, 0, outgoing.Length);
incoming.Reset();
Thread.Sleep(100);
//start the local timer
bool timeoutExpired;
int totalTimeout = Latency + data.Timeout;
using (Timer timer = new Timer(
_ => timeoutExpired = true,
state: null,
dueTime: totalTimeout,
period: Timeout.Infinite))
{
//reception loop, until a valid response or timeout
timeoutExpired = false;
while (timeoutExpired == false)
{
int length = Port.BytesToRead;
if (length > 0)
{
if (length > tempSize)
{
length = tempSize;
}
//read the incoming data from the physical port
Port
.Read(temp, 0, length);
//append data to the writer
incoming.WriteBytes(
temp,
0,
length);
//try to decode the stream
data.IncomingData = incoming.ToReader();
CommResponse result = data
.OwnerProtocol
.Codec
.ClientDecode(data);
//exit whether any concrete result: either good or bad
if (result.Status == CommResponse.Ack)
{
return(result);
}
else if (result.Status == CommResponse.Critical)
{
return(result);
}
else if (result.Status != CommResponse.Unknown)
{
break;
}
}
Thread.Sleep(100);
//stop immediately if the host asked to abort
//TODO
}
} //using (timer)
} //for
//no attempt was successful
return(new CommResponse(
data,
CommResponse.Critical));
} //lock
}
/// <summary>
/// Running thread handler
/// </summary>
private void Worker()
{
//create a writer for the incoming data
ByteArrayWriter writer = null;
//loop, until the host closes
while (_closing == false)
{
//look for incoming data
int length = Port.BytesToRead;
if (length > 0)
{
var buffer = new byte[length];
//read the data from the physical port
Port.Read(
buffer,
0,
length);
Protocol.OnIncommingData(buffer, length);
//append the data to the writer
if (writer == null)
{
writer = new ByteArrayWriter();
}
writer.WriteBytes(
buffer,
0,
length);
//try to decode the incoming data
var data = new ServerCommData(Protocol);
data.IncomingData = writer.ToReader();
CommResponse result = Protocol
.Codec
.ServerDecode(data);
if (result.Status == CommResponse.Ack)
{
//the command is recognized, so call the host back
OnServeCommand(data);
//encode the host data
Protocol
.Codec
.ServerEncode(data);
//return the resulting data to the remote caller
byte[] outgoing = data
.OutgoingData
.ToArray();
Port.Write(
outgoing,
0,
outgoing.Length);
Protocol.OnOutgoingData(outgoing);
writer = null;
}
else if (result.Status == CommResponse.Ignore)
{
writer = null;
}
}
Thread.Sleep(100);
}
}
