public IDataProtocol GetProtocol(DataProtocolVersion dataProtocolVersion)
{
IDataProtocol protocol = _container.GetAllInstances <IDataProtocol>().SingleOrDefault(p => p.Version == dataProtocolVersion);
if (protocol == null)
{
// this exception means error in implementation => If we have DataProtocolVersion enum value, we should have protocol class registered
throw new InvalidOperationException($"No protocol {dataProtocolVersion} registered in container");
}
return(protocol);
}
/// <summary>
/// Read QueueEqntry from DataFile frame stream. This method is thread-safe.
/// </summary>
/// <exception cref="InvalidCrcException">This exception is thrown if crc calculated from stream does nto equal crc written in the file</exception>
/// <exception cref="UnsupportedProtocolVersionException">This exception is thrown if stream data indicate to not implemented protocol</exception>
/// <exception cref="InvalidBoundryByteException">This exception is thrown if values of start or end byte have wrong values. This might indicate that while reading, application poiints to wrong place in the stream</exception>
/// <exception cref="DataFrameException">This exception is thrown if frame is not up to specification</exception>
public QueueEntry ReadEntry(QueueContext context, Stream inputStream)
{
#warning TEST
if (!ReadStartByte(context, inputStream))
{
return(null);
}
DataProtocolVersion dataProtocolVersion = ReadDataProtocolVersion(context, inputStream);
int messageLength = ReadMessageLength(context, inputStream);
byte[] messageBuffer = ReadMessageBuffer(context, inputStream, messageLength);
uint crc = ReadCrc(context, inputStream);
CheckCrc(context, messageBuffer, crc);
ReadEndByte(context, inputStream);
return(_dataProtocolFactory.GetProtocol(dataProtocolVersion).GetEntry(messageBuffer));
}
protected DataProtocol(DataProtocolVersion version)
{
Version = version;
}
