/// <summary>
/// Add the content of another writer to the writer
/// </summary>
/// <param name="value"></param>
/// <remarks>
/// This functionality is not allowed when the writer has been sealed
/// </remarks>
public void WriteBytes(ByteArrayWriter writer)
{
this.WriteBytes(((IByteArray)writer).Data);
}
/// <summary>
/// Running thread handler
/// </summary>
private void Worker()
{
//create a writer for the incoming data
ByteArrayWriter writer = null;
//loop, until the host closes
while (this._closing == false)
{
//look for incoming data
int length = this.Port.BytesToRead;
if (length > 0)
{
var buffer = new byte[length];
//read the data from the physical port
this.Port.Read(
buffer,
0,
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(this.Protocol);
data.IncomingData = writer.ToReader();
CommResponse result = this.Protocol
.Codec
.ServerDecode(data);
if (result.Status == CommResponse.Ack)
{
//the command is recognized, so call the host back
this.OnServeCommand(data);
//encode the host data
this.Protocol
.Codec
.ServerEncode(data);
//return the resulting data to the remote caller
byte[] outgoing = data
.OutgoingData
.ToArray();
this.Port.Write(
outgoing,
0,
outgoing.Length);
writer = null;
}
else if (result.Status == CommResponse.Ignore)
{
writer = null;
}
}
Thread.Sleep(0);
}
}
/// <summary>
/// Running thread handler
/// </summary>
protected override void Worker()
{
Debug.Print("start");
//start the local timer, which gets the session dying
int counter = IdleTimeout;
using (Timer timer = new Timer(
_ => counter--,
state: null,
dueTime: 1000,
period: 1000))
{
//create a writer for the incoming data
ByteArrayWriter writer = null;
var buffer = new byte[CacheSize];
//loop, until the host closes, or the timer expires
while (
this._closing == false &&
counter > 0)
{
//look for incoming data
int length = this.Port.Available;
if (length > 0)
{
if (length > CacheSize)
{
length = CacheSize;
}
//read the data from the physical port
this.Port.Receive(
buffer,
length,
SocketFlags.None);
//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(this.Protocol);
data.IncomingData = writer.ToReader();
CommResponse result = this.Protocol
.Codec
.ServerDecode(data);
if (result.Status == CommResponse.Ack)
{
//the command is recognized, so call the host back
this.OnServeCommand(data);
//encode the host data
this.Protocol
.Codec
.ServerEncode(data);
//return the resulting data to the remote caller
byte[] outgoing = data
.OutgoingData
.ToArray();
this.Port.Send(outgoing);
//reset the timer
counter = IdleTimeout;
writer = null;
}
else if (result.Status == CommResponse.Ignore)
{
writer = null;
}
}
Thread.Sleep(0);
}
}
this.Port.Close();
Debug.Print("close");
}
/// <summary>
/// Entry-point for submitting a query to the remote device
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public CommResponse Query(ClientCommData data)
{
lock (this.Port)
{
//set the proper parameters to the port
//this.Port.BaudRate = this.Setting.BaudRate;
//this.Port.Parity = this.Setting.Parity;
//this.Port.DataBits = this.Setting.DataBits;
//this.Port.StopBits = this.Setting.StopBits;
//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 = 64;
var temp = new byte[tempSize];
//retries loop
for (int attempt = 0, retries = data.Retries; attempt < retries; attempt++)
{
//flush any residual content
this.Port
.DiscardInBuffer();
this.Port
.DiscardOutBuffer();
//phyiscal writing
this.Port
.Write(outgoing, 0, outgoing.Length);
incoming.Reset();
//start the local timer
bool timeoutExpired;
int totalTimeout = this.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 = this.Port.BytesToRead;
if (length > 0)
{
if (length > tempSize)
{
length = tempSize;
}
//read the incoming data from the physical port
this.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(0);
//stop immediately if the host asked to abort
//TODO
}
} //using (timer)
} //for
//no attempt was successful
return(new CommResponse(
data,
CommResponse.Critical));
} //lock
}
