/// <summary>
/// Prepare this state for use in a live railway.
/// Make sure all relevant connections to other state objects are resolved.
/// </summary>
/// <returns>True if the entity is now ready for use in a live railway, false otherwise.</returns>
protected override bool TryPrepareForUse(IStateUserInterface ui, IStatePersistence statePersistence)
{
if (!base.TryPrepareForUse(ui, statePersistence))
{
return(false);
}
try
{
discoveryBroadcaster.Start();
}
catch (Exception ex)
{
Log.Error("Failed to start discovery broadcaster: " + ex);
return(false);
}
try
{
localWorkerService = new LocalWorkerServiceImpl(this, Log);
grpcServer = new Server
{
Services = { LocalWorkerService.BindService(localWorkerService) },
Ports = { new ServerPort("0.0.0.0", Entity.APIPort, ServerCredentials.Insecure) }
};
grpcServer.Start();
}
catch (Exception ex)
{
Log.Error("Failed to start GRPC server: " + ex);
return(false);
}
try
{
client = new MqttClient(Entity.HostName);
client.MqttMsgPublishReceived += onMqttMsgPublishReceived;
client.MqttMsgPublished += onMqttMsgPublished;
client.ConnectionClosed += onMqttConnectionClosed;
// Power on
client.Connect(clientID);
// Subscribe to topics
var topics = getSubscribeTopics();
var qos = topics.Select(x => MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE).ToArray();
client.Subscribe(topics, qos);
}
catch (Exception ex)
{
Log.Error("Failed to connect to MQTT server: " + ex);
return(false);
}
return(true);
}
public override void Dispose()
{
if (client != null)
{
client.MqttMsgPublishReceived -= onMqttMsgPublishReceived;
client.MqttMsgPublished -= onMqttMsgPublished;
client.ConnectionClosed -= onMqttConnectionClosed;
client.Disconnect();
client = null;
}
discoveryBroadcaster.Stop();
if (localWorkerService != null)
{
localWorkerService.Stop = true;
localWorkerService = null;
}
if (grpcServer != null)
{
grpcServer.ShutdownAsync().Wait();
grpcServer = null;
}
base.Dispose();
}
