public static async Task Main(string[] args)
{
IConfiguration config = new ConfigurationBuilder()
.AddJsonFile("settings.json", true, true)
.AddJsonFile("settings.local.json", true, true)
.Build();
AisConfig aisConfig = config.GetSection("Ais").Get <AisConfig>();
StorageConfig storageConfig = config.GetSection("Storage").Get <StorageConfig>();
IStorageClient storageClient = new AzureAppendBlobStorageClient(storageConfig);
INmeaReceiver receiver = new NetworkStreamNmeaReceiver(
aisConfig.Host,
aisConfig.Port,
aisConfig.RetryPeriodicity,
aisConfig.RetryAttempts);
// INmeaReceiver receiver = new FileStreamNmeaReceiver(@"PATH-TO-RECORDING.nm4");
var receiverHost = new ReceiverHost(receiver);
// Decode teh sentences into messages, and group by the vessel by Id
IObservable <IGroupedObservable <uint, IAisMessage> > byVessel = receiverHost.Messages.GroupBy(m => m.Mmsi);
// Combine the various message types required to create a stream containing name and navigation
IObservable <(uint mmsi, IVesselNavigation navigation, IVesselName name)>?vesselNavigationWithNameStream =
from perVesselMessages in byVessel
let vesselNavigationUpdates = perVesselMessages.OfType <IVesselNavigation>()
let vesselNames = perVesselMessages.OfType <IVesselName>()
let vesselLocationsWithNames = vesselNavigationUpdates.CombineLatest(vesselNames, (navigation, name) => (navigation, name))
from vesselLocationAndName in vesselLocationsWithNames
select(mmsi : perVesselMessages.Key, vesselLocationAndName.navigation, vesselLocationAndName.name);
vesselNavigationWithNameStream.Subscribe(navigationWithName =>
{
(uint mmsi, IVesselNavigation navigation, IVesselName name) = navigationWithName;
string positionText = navigation.Position is null ? "unknown position" : $"{navigation.Position.Latitude},{navigation.Position.Longitude}";
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine($"[{mmsi}: '{name.VesselName.CleanVesselName()}'] - [{positionText}] - [{navigation.CourseOverGroundDegrees ?? 0}]");
Console.ResetColor();
});
var batchBlock = new BatchBlock <string>(storageConfig.WriteBatchSize);
var actionBlock = new ActionBlock <IEnumerable <string> >(storageClient.PersistAsync);
batchBlock.LinkTo(actionBlock);
// Write out the messages as they are received over the wire.
receiverHost.Sentences.Subscribe(sentence => Console.WriteLine(sentence));
// Persist the messages as they are received over the wire.
receiverHost.Sentences.Subscribe(batchBlock.AsObserver());
var cts = new CancellationTokenSource();
Task task = receiverHost.StartAsync(cts.Token);
// If you wanted to cancel the long running process:
// cts.Cancel();
await task;
}
