/// <summary>
/// Get a flight plan from the database and return it.
/// </summary>
/// <param name="id"> The id of the flight plan. </param>
/// <returns> The flight plan. </returns>
public async Task <FlightPlan> GetFlightPlan(string id)
{
// Try get the flight plan from the local data base.
FlightPlan local = await flightsDB.GetFlightPlan(id);
if (local != null)
{
return(local);
}
/* If flight plan not in local data base, try to retrieve it from an
* external server.
* Get the server in which the flight plan is located. */
FlightServer relevantServer = await flightsServersDB.GetFlightServer(id);
if (relevantServer != null)
{
// Ask the external server for the flight plan.
Server server = await serversDB.GetServer(relevantServer.ServerId);
IHTTPClient client = new HTTPClient(server);
return(await client.GetFlightPlan(id));
}
return(null);
}
public async Task AddFlightServer(FlightServer fs)
{
FlightServer exists = await this.GetFlightServer(fs.FlightId);
if (exists != null)
{
return;
}
// Opening the connection
using SQLiteConnection con = new SQLiteConnection(connectionString);
await con.OpenAsync();
// Creating the query to insert
using var command = new SQLiteCommand(
"INSERT into FlightsServers (flightid, serverid) VALUES (@FId, @SId)", con);
// Inserting the parameters with value
command.Parameters.AddWithValue("@FId", fs.FlightId);
command.Parameters.AddWithValue("@SId", fs.ServerId);
try
{
// Writing that to DB
var res = await command.ExecuteNonQueryAsync();
// Failed
if (res == 0)
{
throw new ArgumentException("Failed post serverflight.");
}
}
// The id is already there so failed
catch (Exception)
{
throw new ArgumentException("Serverflight already in data base.");
}
}
public async IAsyncEnumerable <FlightServer> GetServerIterator(string serverid)
{
// Opening the connection
using SQLiteConnection con = new SQLiteConnection(connectionString);
await con.OpenAsync();
// Get all the flightservers with that serverid
using var command = new SQLiteCommand("SELECT * FROM FlightsServers WHERE serverid = '"
+ serverid + "'", con);
using SQLiteDataReader rdr = (SQLiteDataReader) await command.ExecuteReaderAsync();
// Reading and returning them one by one
while (await rdr.ReadAsync())
{
// Getting
string fid = rdr.GetString(0);
string sid = rdr.GetString(1);
// Returning
FlightServer fs = new FlightServer(fid, sid);
yield return(fs);
}
yield break;
}
public FlightServerImplementation(FlightServer flightServer)
{
_flightServer = flightServer;
}