/// <summary>
/// Parses a single quote message from a reading file.
/// </summary>
/// <param name="r">the <c>BinaryReader</c> object reading the target file.</param>
/// <returns>The parsed <c>QuoteMessage</c> object or null if all available objects have been read.</returns>
private QuoteMessage ReadQuoteMessage()
{
try
{
QuoteMessage result = null;
int length = IPAddress.NetworkToHostOrder(m_reader.ReadInt32());
ushort funcCode = Bytes.NetworkToHostOrder(m_reader.ReadUInt16());
int bodyLength = IPAddress.NetworkToHostOrder(m_reader.ReadInt32());
byte[] body = new byte[length];
int count = m_reader.Read(body, BidMessage.HeaderLength, bodyLength);
if (count == bodyLength)
{
result = (QuoteMessage)BidMessage.Create(FunctionCodes.Quote, body, 0, length);
}
return(result);
}
catch (EndOfStreamException)
{
return(null);
}
}
/// <summary>
/// Examines the entire buffer and parses all <c>QuoteMessage</c>s in it.
/// </summary>
private void ParseMessages()
{
while (m_writeIndex - m_readIndex > BidMessage.HeaderLength)
{
int length = 0;
ushort funcCode = 0;
int bodyLength = 0;
for (; m_writeIndex - m_readIndex >= BidMessage.HeaderLength; m_readIndex++)
{
int offset = m_readIndex;
length = m_buffer.ToInt32(offset);
offset += sizeof(int);
funcCode = m_buffer.ToUInt16(offset);
offset += sizeof(ushort);
bodyLength = m_buffer.ToInt32(offset);
if (length - bodyLength == BidMessage.HeaderLength)
{
break;
}
}
// loop guard is true iff the next message is successfully located
// break if this fails or only part of next message is found
if (m_writeIndex - m_readIndex < BidMessage.HeaderLength || m_writeIndex - m_readIndex < length)
{
break;
}
if (funcCode == (ushort)FunctionCodes.Quote)
{
QuoteMessage message = (QuoteMessage)BidMessage.Create(FunctionCodes.Quote, m_buffer, m_readIndex, length);
OnQuoteMessageReceived(message);
}
m_readIndex += length;
}
// incomplete message
if (m_readIndex != 0)
{
Array.Copy(m_buffer, m_readIndex, m_buffer, 0, m_writeIndex - m_readIndex);
m_writeIndex -= m_readIndex;
m_readIndex = 0;
}
}
/// <summary>
/// Uses the credentials to authenticate with the remote server.
/// Goes to states <c>Create</c>, <c>Receive</c>, and <c>Close</c>.
/// </summary>
/// <returns>Time to wait till next state is run, in milliseconds.</returns>
private int Authenticate()
{
ChangeStatus(QuoteProviderStatus.Authenticate);
try
{
SessionKeyRequestMessage sessionKeyRequest = new SessionKeyRequestMessage(m_username);
int length = sessionKeyRequest.GetBytes(m_buffer, 0);
int count = m_client.Send(m_buffer, 0, length, SocketFlags.None);
count = m_client.Receive(m_buffer);
length = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(m_buffer, 0));
SessionKeyReplyMessage sessionKeyReply = (SessionKeyReplyMessage)BidMessage.Create(FunctionCodes.SessionKeyReply, m_buffer, 0, length);
uint sessionKey = sessionKeyReply.SessionKey;
LoginRequestMessage LoginRequest = new LoginRequestMessage(m_username, m_password, sessionKey);
length = LoginRequest.GetBytes(m_buffer, 0);
count = m_client.Send(m_buffer, 0, length, SocketFlags.None);
count = ReceiveMessage();
length = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(m_buffer, 0));
LoginReplyMessage loginReply = (LoginReplyMessage)BidMessage.Create(FunctionCodes.LoginReply, m_buffer, 0, length);
m_maxHeartbeatInterval = loginReply.MaxHeartbeatInterval;
if (m_maxHeartbeatInterval > 0)
{
m_retryTimes = 0;
m_readIndex = m_writeIndex = 0;
m_lastReception = m_lastHeartbeat = (uint)Environment.TickCount;
m_runByState = Receive;
}
else
{
throw new Exception("Invalid login.");
}
}
catch (SocketException se)
{
OnErrorOccurred(se, false);
return(RetryOrGiveup(m_status));
}
catch (Exception ex)
{
OnErrorOccurred(ex, true);
m_runByState = Close;
}
return(0);
}
