/// <summary>
/// Creates database records and updates internal objects to track an aircraft that is currently transmitting messages.
/// </summary>
/// <param name="message"></param>
private void TrackFlight(BaseStationMessage message)
{
if (IsTransmissionMessage(message))
{
lock (_SyncLock) {
if (_Session != null)
{
var localNow = Provider.LocalNow;
FlightRecords flightRecords;
if (!_FlightMap.TryGetValue(message.Icao24, out flightRecords))
{
flightRecords = new FlightRecords();
_Database.StartTransaction();
try {
flightRecords.Aircraft = FetchOrCreateAircraft(localNow, message.Icao24);
flightRecords.Flight = CreateFlight(localNow, flightRecords.Aircraft.AircraftID, message.Callsign);
flightRecords.EndTimeUtc = Provider.UtcNow;
_Database.EndTransaction();
} catch (ThreadAbortException) {
} catch (Exception ex) {
Debug.WriteLine(String.Format("BaseStationDatabaseWriter.Plugin.TrackFlight caught exception {0}", ex.ToString()));
_Database.RollbackTransaction();
throw;
}
_FlightMap.Add(message.Icao24, flightRecords);
}
else
{
if (flightRecords.Flight.Callsign.Length == 0 && !String.IsNullOrEmpty(message.Callsign))
{
var databaseVersion = _Database.GetFlightById(flightRecords.Flight.FlightID);
flightRecords.Flight.Callsign = databaseVersion.Callsign = message.Callsign;
_Database.UpdateFlight(databaseVersion);
}
}
var flight = flightRecords.Flight;
flightRecords.EndTimeUtc = Provider.UtcNow;
flight.EndTime = localNow;
if (message.SquawkHasChanged.GetValueOrDefault())
{
flight.HadAlert = true;
}
if (message.IdentActive.GetValueOrDefault())
{
flight.HadSpi = true;
}
if (message.Squawk == 7500 || message.Squawk == 7600 || message.Squawk == 7700)
{
flight.HadEmergency = true;
}
UpdateFirstLastValues(message, flight, flightRecords);
UpdateMessageCounters(message, flight);
}
}
}
}
/// <summary>
/// Updates the flights that the plugin is tracking to show information about the beginning and end of the flight.
/// </summary>
/// <param name="flushAll"></param>
private void FlushFlights(bool flushAll)
{
var utcNow = Provider.UtcNow;
KeyValuePair <int, FlightRecords>[] flushEntries = null;
lock (_SyncLock) {
flushEntries = (flushAll ? _FlightMap : _FlightMap.Where(kvp => kvp.Value.EndTimeUtc.AddMinutes(25) <= utcNow)).ToArray();
}
_Database.StartTransaction();
try {
foreach (var kvp in flushEntries)
{
_Database.UpdateFlight(kvp.Value.Flight);
}
_Database.EndTransaction();
lock (_SyncLock) {
foreach (var kvp in flushEntries)
{
_FlightMap.Remove(kvp.Key);
}
}
} catch {
_Database.RollbackTransaction();
throw;
}
}