/// <summary>
/// Safely closes a connection by notifying listeners before and after the connection is closed.
/// </summary>
public static void DestroyConnection()
{
if (ELM327Connection._singleton._connection != null && ELM327Connection._singleton._connection.IsOpen)
{
lock (ELM327Connection._singleton._connection)
{
// Notify our listeners that the connection is closing
if (ELM327Connection.ConnectionClosingEvent != null)
{
ELM327Connection.ConnectionClosingEvent();
}
try
{
// Stop operations
ELM327Connection._singleton._elm327device.StopOperations();
ELM327Connection._singleton._elm327device = null;
ELM327Connection._singleton._connection.Close();
}
catch (Exception e)
{
log.Error("Error while attempting to close ELM327 SerialPort connection.", e);
}
// Notify our listeners that the connection has closed
if (ELM327Connection.ConnectionDestroyedEvent != null)
{
ELM327Connection.ConnectionDestroyedEvent();
}
ELM327Connection._singleton._connection = null;
}
}
}
/// <summary>
/// Stores a reference to the SerialPort with the new connection and notifies listeners.
/// </summary>
/// <param name="connection">SerialPort with the new connection.</param>
public static void ConnectionEstablished(SerialPort connection, ConnectionSettings connectionSettings)
{
ELM327Connection._singleton._connection = connection;
lock (ELM327Connection._singleton._connection)
{
ELM327Connection._singleton._elm327device = new ELM327(ELM327Connection._singleton._connection, connectionSettings);
ELM327Connection._singleton._elm327device.ConnectionLost += ELM327Connection.DestroyConnection;
// If we could not start operations, stop everything
if (!(ELM327Connection._singleton._elm327device.StartOperations()))
{
// Log an error
log.Error("Error occurred when attempting to start operations on ELM327 device.");
// Close connection
try
{
ELM327Connection._singleton._connection.Close();
}
catch (IOException e)
{
log.Error("Error occurred while trying to close connection after a failed attempt to start ELM327 operations.", e);
}
// Clear everything
ELM327Connection._singleton._connection = null;
ELM327Connection._singleton._elm327device = null;
return;
}
// If a connection has been successfully established, load our protocol handlers
// and notify our listeners that the connection is live and read for communication
if (ELM327Connection.ConnectionEstablishedEvent != null)
{
ELM327Connection._singleton._elm327device.ClearHandlers();
foreach (Type nextHandlerType in _loadedHandlerTypes)
{
ELM327Connection._singleton._elm327device.AddHandler(nextHandlerType);
}
ELM327Connection.ConnectionEstablishedEvent(connection);
}
}
}
