/// <summary>
/// Creates a new session.
/// </summary>
/// <param name="configuration">The session configuration</param>
/// <param name="clock">The session clock</param>
/// <param name="transport">The session transport</param>
/// <param name="logger">The session logger</param>
/// <param name="bufferSize">The buffersize to use for buffering</param>
/// <param name="maxMessageLength">The maximum supported length of a fix message</param>
/// <param name="maxMessageFields">The maximum supported number of fields in a fix message</param>
public Session(Configuration configuration, IClock clock, ITransport transport, ILogger logger, int bufferSize, int maxMessageLength, int maxMessageFields)
{
Clock = clock;
Logger = logger;
Configuration = configuration;
Channel = new Channel(transport, bufferSize);
State = new State
{
InboundSeqNum = configuration.InboundSeqNum,
OutboundSeqNum = configuration.OutboundSeqNum,
InboundTimestamp = clock.Time,
OutboundTimestamp = clock.Time,
HeartbeatInterval = TimeSpan.FromSeconds(configuration.HeartbeatInterval * 1.0),
HeartbeatTimeoutMin = TimeSpan.FromSeconds(configuration.HeartbeatInterval * 1.2),
HeartbeatTimeoutMax = TimeSpan.FromSeconds(configuration.HeartbeatInterval * 2.0)
};
if (Logger != null)
{
Channel.Inbound = Logger.Inbound;
Channel.Outbound = Logger.Outbound;
}
Inbound = new FIXMessage(maxMessageLength, maxMessageFields)
{
Clock = Clock
};
Outbound = new FIXMessageWriter(maxMessageLength)
{
Clock = Clock
};
}
/// <summary>
/// Reads a message from the transport and returns true/false to indicate whether a valid message was read.
/// </summary>
/// <param name="message">The message to read into.</param>
/// <returns>Whether a valid message was read.</returns>
public bool Read(FIXMessage message)
{
if (_current == _head)
{
_head += Transport.Read(_buffer, _head, _buffer.Length - _head);
}
for (; _current < _head; _current++)
{
if (_current - _tail < 8)
{
continue;
}
if (_buffer[_current - 0] != SOH)
{
continue;
}
if (_buffer[_current - 4] != '=')
{
continue;
}
if (_buffer[_current - 5] != '0')
{
continue;
}
if (_buffer[_current - 6] != '1')
{
continue;
}
if (_buffer[_current - 7] != SOH)
{
continue;
}
message.Parse(_buffer, _tail, _current - _tail + 1);
Inbound?.Invoke(_buffer, _tail, _current - _tail + 1);
_tail = _current + 1;
// If there's no more buffered data - reset the buffer
if (_tail == _head)
{
_tail = _head = _current = 0;
}
return(message.Valid);
}
// If there's no more buffer space - reset the buffer
if (_head == _buffer.Length && _head == _current)
{
var buffered = _head - _tail;
// NOTE: This may or may not be needed but we put it in for safety
if (_tail < buffered)
{
throw new Exception("Unable to reset buffer - not enough space");
}
Buffer.BlockCopy(_buffer, _tail, _buffer, 0, buffered);
_tail = 0;
_head = _current = buffered;
}
return(false);
}
