/// <summary>
/// Get all the flights from this server and other servers.
/// </summary>
/// <param name="relativeTo"> Time at the student's. </param>
/// <returns> All the flights. </returns>
public async Task <IList <Flight.Flight> > GetAllFlightsSync(DateTime relativeTo)
{
// Get first all local flights.
Task <IList <Flight.Flight> > localFlights = GetAllFlights(relativeTo);
/* Create a list contains lists of external flights.
* Each inner list represents flights from a specifiec server. */
IList <Task <IList <Flight.Flight> > > externalFlights =
new List <Task <IList <Flight.Flight> > >();
IList <KeyValuePair <string, string> > serversUpdates =
new List <KeyValuePair <string, string> >();
await foreach (Server server in serversDB.GetAllServers())
{
// For each server, ask it for all its flights.
HTTPClient client = new HTTPClient(server);
Task <IList <Flight.Flight> > externals = client.GetFlights(
relativeTo.ToString("yyyy-MM-ddTHH:mm:ssZ"));
IList <Flight.Flight> res = await externals;
if (res == null)
{
continue;
}
foreach (Flight.Flight flight in res)
{
/* Change isExternal property of the flight to true,
* as it was retrieved from an external server. */
flight.IsExternal = true;
serversUpdates.Add(new KeyValuePair <string, string>(
flight.FlightID, server.Id));
}
externalFlights.Add(externals);
}
IList <Flight.Flight> temp = await localFlights;
/* Join all the lists from the servers and the list of the local flight to
* one list of flights. */
foreach (Task <IList <Flight.Flight> > flightsList in externalFlights)
{
temp = temp.Concat(await flightsList).ToList();
}
foreach (KeyValuePair <string, string> pair in serversUpdates)
{
/* Add the id of the flight to the data base. Connect it to its server.
* Next time we want the flight plan we can
* simply ask it from the relevant server. */
await flightsServersDB.AddFlightServer(
new Servers.FlightServer(pair.Key, pair.Value));
}
return(temp);
}