private async Task <GetOrCreateClientSessionResult> GetOrCreateClientSessionAsync(MqttConnectPacket connectPacket)
{
await _sessionsSemaphore.WaitAsync().ConfigureAwait(false);
try
{
var isSessionPresent = _sessions.TryGetValue(connectPacket.ClientId, out var clientSession);
if (isSessionPresent)
{
if (connectPacket.CleanSession)
{
_sessions.Remove(connectPacket.ClientId);
await clientSession.StopAsync();
clientSession = null;
_logger.LogTrace("Stopped existing session of client '{0}'.", connectPacket.ClientId);
}
else
{
_logger.LogTrace("Reusing existing session of client '{0}'.", connectPacket.ClientId);
}
}
var isExistingSession = true;
if (clientSession == null)
{
isExistingSession = false;
clientSession = _clientSesssionFactory.CreateClientSession(connectPacket.ClientId, this);
_sessions[connectPacket.ClientId] = clientSession;
_logger.LogTrace("Created a new session for client '{0}'.", connectPacket.ClientId);
}
return(new GetOrCreateClientSessionResult {
IsExistingSession = isExistingSession, Session = clientSession
});
}
finally
{
_sessionsSemaphore.Release();
}
}
private GetOrCreateClientSessionResult GetOrCreateClientSession(MqttConnectPacket connectPacket)
{
lock (_clientSessions)
{
var isSessionPresent = _clientSessions.TryGetValue(connectPacket.ClientId, out var clientSession);
if (isSessionPresent)
{
if (connectPacket.CleanSession)
{
_clientSessions.Remove(connectPacket.ClientId);
clientSession.Stop();
clientSession = null;
_logger.LogTrace("Stopped existing session of client '{0}'.", connectPacket.ClientId);
}
else
{
_logger.LogTrace("Reusing existing session of client '{0}'.", connectPacket.ClientId);
}
}
var isExistingSession = true;
if (clientSession == null)
{
isExistingSession = false;
clientSession = _clientSesssionFactory.CreateClientSession(connectPacket.ClientId, this);
_clientSessions[connectPacket.ClientId] = clientSession;
_logger.LogTrace("Created a new session for client '{0}'.", connectPacket.ClientId);
}
return(new GetOrCreateClientSessionResult {
IsExistingSession = isExistingSession, Session = clientSession
});
}
}