/// <summary>
/// The AddMessage method adds an instance of a FIX message
/// to the database file that is associated with the specified
/// session. The index file is updated to reflect the position
/// in the database of the message that is being added.
/// </summary>
/// <param name="sessionId">
/// The session id of the session the message relates to.
/// </param>
/// <param name="msg">
/// The FIX message to be added to the database.
/// </param>
public void AddMessage(string sessionId, FixMessage msg)
{
// REC: Create the details instance for the task:
TaskDetails_Add taskDetails = new TaskDetails_Add(sessionId, msg);
// REC: Enqueue the task for asynchronous execution:
_sequencer.Enqueue(AddMessage_Entrypoint, taskDetails);
}
/// <summary>
/// The AddMessage_Entrypoint method is the asynchronous
/// entrypoint for processing add message requests that have
/// been enqueued to the .NET thread pool through the instance
/// of the sequencer that is associated with the database.
/// </summary>
/// <param name="state">
/// The instance of TaskDetails_Add that is associated with
/// the asynchronous add message request being processed.
/// </param>
private void AddMessage_Entrypoint(object state)
{
TaskDetails_Add taskDetails = state as TaskDetails_Add;
if (taskDetails != null)
{
FixField fldSequence = taskDetails.SessionMsg.Header.GetField(34);
if (fldSequence != null)
{
// REC: Retrieve the message's text so that its
// length can be assigned to its index entry:
string msgText = taskDetails.SessionMsg.ToString();
// REC: Create an entry for the message in the
// index file associated with the session:
if (_mapSessions.ContainsKey(taskDetails.SessionId))
{
SessionDetails details = _mapSessions[taskDetails.SessionId];
IndexEntry idxEntry = new IndexEntry();
idxEntry.msgOffset = details.MsgWriter.BaseStream.Position;
idxEntry.msgLength = msgText.Length;
idxEntry.msgSequence = int.Parse(fldSequence.Content);
details.Index.Add(idxEntry);
details.MsgWriter.Write(msgText.ToCharArray());
details.MsgWriter.Flush();
string idxLine = string.Format("{0}:{1}:{2}", idxEntry.msgSequence, idxEntry.msgOffset, idxEntry.msgLength);
details.IdxWriter.WriteLine(idxLine.ToCharArray());
details.IdxWriter.Flush();
}
}
}
}
