public override DataPacket ConvertToDataPacket()
{
using (MemoryStream sink = new MemoryStream ())
{
StreamHelper.WriteUInt16 (RequestIdentifier, sink);
Write (sink);
sink.Flush ();
DataPacket packet = new DataPacket (true, Subsystem, sink.ToArray ());
packet.PacketNr = _request.PacketIdentifier.PacketNr;
return packet;
}
}
/// <summary>
/// Converts this request to a default representation of a DataPacket
/// </summary>
/// <returns>
/// A <see cref="DataPacket"/>
/// </returns>
public virtual DataPacket ConvertToDataPacket()
{
using(MemoryStream sink = new MemoryStream())
{
StreamHelper.WriteUInt16(RequestIdentifier, sink);
Write(sink);
sink.Flush();
DataPacket packet = new DataPacket(false, Subsystem, sink.ToArray());
return packet;
}
}
public bool TrySetResponsePacket(DataPacket packet)
{
lock(this)
{
if(_packetExpired) return false;
_responsePacket = packet;
return true;
}
}
/// <summary>
/// Is called when a new DataPacket from the remote end point receives
/// </summary>
private void OnRequestPacketReceived(DataPacket packet)
{
if(_configured == false)
_configuredEvent.WaitOne();
if(_subsystems.ContainsKey(packet.Subsystem))
{
_logger.DebugFormat("Redirecting packet to subsystem '{0}'", packet.Subsystem);
_subsystems[packet.Subsystem].HandlePacket(packet);
}
else
{
_logger.WarnFormat("Subsystem '{0}' has not been found", packet.Subsystem);
}
}
/// <summary>
/// Receives packets from the connection stream.
/// The classification of the packet (response or request packet) and
/// the assignment to subsystems is done outside
/// </summary>
private void ReceiveProc()
{
try
{
while(!_disposed)
{
if(_connection.Connected)
{
DataPacket packet = new DataPacket(_connection);
#if DEBUG_PACKETTRANSMITTER
_logger.DebugFormat("Received DataPacket: {0}", packet);
#endif
if(packet.IsResponse)
HandleResponsePackets(packet);
else
HandleRequestPackets(packet);
}
else
_receiveThreadWaitEvent.WaitOne(_maxReceiveThreadWaitTime);
}
}
catch(DisconnectedException)
{
Dispose();
}
}
public PacketInfo(DataPacket packetToTransmit, bool awaitsResponse)
{
_packetToTransmit = packetToTransmit;
_awaitsResponse = awaitsResponse;
}
private void RaiseRequestPacketReceived(DataPacket dataPacket)
{
if(RequestPacketReceived != null)
RequestPacketReceived.BeginInvoke(dataPacket, null, null);
}
/// <summary>
/// Trys to find the corresponding request packet, sets this packet as response
/// and permits the transmitter of the origin request packet to proceed
/// </summary>
private void HandleResponsePackets(DataPacket dataPacket)
{
lock(_packetsWaitingForResponse)
{
if(_packetsWaitingForResponse.ContainsKey(dataPacket.PacketNr) == false)
{
//TODO: Log the packet, there is no corresponding request packet which waits
//for a response
}
else
{
PacketInfo requestPacket = _packetsWaitingForResponse[dataPacket.PacketNr];
requestPacket.ResponsePacket = dataPacket;
_packetsWaitingForResponse.Remove(dataPacket.PacketNr);
requestPacket.PacketResponseSync.Set();
}
}
}
/// <summary>
/// Handles packets that are not marked as response packets,
/// they are simply passed to the outside of the PacketTransmitter
/// to the target subsystem
/// </summary>
private void HandleRequestPackets(DataPacket dataPacket)
{
RaiseRequestPacketReceived(dataPacket);
}
/// <summary>
/// Transmits the specified packet to the connected host, and waits till a response
/// with the specified type is received
/// </summary>
/// <param name="packet">A <see cref="DataPacket"/> to transmit</param>
/// <returns>Returns the specified response</returns>
public DataPacket TransmitWithResponse(DataPacket packet)
{
PacketInfo packetToTransmit = new PacketInfo(packet, true);
EnqueuePacket(packetToTransmit);
packetToTransmit.PacketResponseSync.WaitOne();
return packetToTransmit.ResponsePacket;
}
/// <summary>
/// Transmits the specified packet to the connected host.
/// </summary>
/// <param name="packet">A <see cref="DataPacket"/> to transmit</param>
public void TransmitWithoutResponse(DataPacket packet)
{
PacketInfo packetToTransmit = new PacketInfo(packet, false);
EnqueuePacket(packetToTransmit);
}
