// Convenience method to create a queue or standard subscriber
private IStanSubscription CreateSubscriber(IStanConnection c, EventHandler <StanMsgHandlerArgs> msgHandler)
{
if (qGroup != null)
{
return(c.Subscribe(subject, qGroup, sOpts, msgHandler));
}
return(c.Subscribe(subject, sOpts, msgHandler));
}
public void Start()
{
// connect to STAN
var cf = new StanConnectionFactory();
var natsOptions = StanOptions.GetDefaultOptions();
natsOptions.NatsURL = "nats://localhost:4223";
_stanConnection = cf.CreateConnection("test-cluster", "ShippingService", natsOptions);
// create events subscription
StanSubscriptionOptions stanOptions = StanSubscriptionOptions.GetDefaultOptions();
stanOptions.DurableName = "ShippingService";
// determine where to start reading in the event-stream
ulong?lastSeqNr = GetLastSequenceNumber();
if (lastSeqNr != null)
{
lastSeqNr++;
stanOptions.StartAt(lastSeqNr.Value);
Console.WriteLine($"Replaying from seq# {lastSeqNr}");
}
else
{
stanOptions.DeliverAllAvailable();
Console.WriteLine("Replaying all messages.");
}
_stanConnection.Subscribe("store.events", stanOptions, EventReceived);
}
static void TestSTAN(IStanConnection conn)
{
Task.Run(async() =>
{
var i = 0;
while (true)
{
try
{
string guid = conn.Publish("stest", UTF8Encoding.UTF8.GetBytes(i.ToString()), null);
await Task.Delay(1000);
i++;
}
catch (Exception err)
{
Console.WriteLine(err);
}
}
});
var sOpts = StanSubscriptionOptions.GetDefaultOptions();
sOpts.AckWait = 60000;
var s = conn.Subscribe("stest", sOpts, (obj, msgArs) =>
{
Console.WriteLine(UTF8Encoding.UTF8.GetString(msgArs.Message.Data));
});
}
public async Task StartAsync(string consumerId)
{
StanOptions options = StanOptions.GetDefaultOptions();
options.NatsURL = _natsOptions.Url;
var stanSubOptions = StanSubscriptionOptions.GetDefaultOptions();
stanSubOptions.DurableName = _natsOptions.DurableName;
_stanConnection = new StanConnectionFactory()
.CreateConnection(_natsOptions.ClusterId, consumerId, options);
try
{
_stanConnection
.Subscribe(_natsOptions.Subject, stanSubOptions, (obj, args) =>
{
string messageData = Encoding.UTF8.GetString(args.Message.Data);
Console.WriteLine($"[#{args.Message.Sequence}] {messageData}");
var message = JsonSerializer.Deserialize <Message>(messageData);
message.Number = args.Message.Sequence;
_messageRepository.AddAsync(message).GetAwaiter().GetResult();
});
}
catch (Exception e)
{
_logger.LogError($"Ошибка подписки на сообщения: {e.ToString()}");
CloseConnection();
}
await Task.CompletedTask;
}
public void Subscriber(string subject, EventHandler <StanMsgHandlerArgs> handler, bool in_all = false, bool is_last = false, ulong since_seq_no = 0, DateTime?since_duration = null)
{
if (conn == null || conn.NATSConnection.State != ConnState.CONNECTED)
{
return;
}
StanSubscriptionOptions sOpts = StanSubscriptionOptions.GetDefaultOptions();
if (in_all)
{
sOpts.DeliverAllAvailable();
}
else if (is_last)
{
sOpts.StartWithLastReceived();
}
else if (since_seq_no != 0)
{
sOpts.StartAt(since_seq_no);
}
else if (since_duration.HasValue)
{
sOpts.StartAt(since_duration.Value);
}
subject = $"{producID}_{subject}";
dicSubscription.GetOrAdd(subject, conn.Subscribe(subject, sOpts, handler));
}
internal void ProcessMsgs(string url, string clusterID)
{
IStanConnection sc = null;
try
{
sc = CreateConnection(url, clusterID, "synadia-rel-sub");
var opts = StanSubscriptionOptions.GetDefaultOptions();
opts.AckWait = 60000;
opts.ManualAcks = true;
opts.MaxInflight = 32;
opts.DurableName = "synadia-restest";
sc.Subscribe("synadia.restest", "qg", opts, ProcessMsg);
FeV.WaitOne();
}
catch (Exception e)
{
Log("Create Subscriber failed: " + e);
}
finally
{
sc?.Close();
}
Log("Subscriber is finished.");
}
private TimeSpan ReceiveAsyncSubscriber(IStanConnection c)
{
var sw = new Stopwatch();
var ev = new AutoResetEvent(false);
EventHandler <StanMsgHandlerArgs> msgHandler = (sender, args) =>
{
if (_received == 0)
{
sw.Start();
}
_received++;
if (Verbose)
{
Console.WriteLine("Received seq # {0}: {1}",
args.Message.Sequence,
System.Text.Encoding.UTF8.GetString(args.Message.Data));
}
if (_received >= Count)
{
sw.Stop();
ev.Set();
}
};
using (var s = c.Subscribe(Subject, _sOpts, msgHandler))
{
ev.WaitOne();
}
return(sw.Elapsed);
}
public void ReceiveAsync <T>(string queueName, Action <T> callback)
{
if (string.IsNullOrEmpty(queueName))
{
throw new ArgumentException("Invalid queue name", nameof(queueName));
}
var opts = StanSubscriptionOptions.GetDefaultOptions();
opts.DurableName = queueName;
if (!_typeSubscribers.ContainsKey(typeof(T)))
{
_typeSubscribers.Add(typeof(T), new Subscribers <T>());
}
((Subscribers <T>)_typeSubscribers[typeof(T)]).Add(callback);
_connection.Subscribe(queueName, opts, (sender, args) =>
{
var t = (T)BinaryFormatter.Deserialize(new MemoryStream(args.Message.Data));
foreach (var subscriberCallback in (Subscribers <T>)_typeSubscribers[typeof(T)])
{
subscriberCallback(t);
}
});
}
public void Subscribe()
{
Assert.Equal(ConnState.CONNECTED, connection.NATSConnection.State);
StanMsg <Person> received = null;
using (var subscription = connection.Subscribe <Person>("subject",
(sender, args) =>
{
received = args.Msg;
received.Ack();
}))
{
var jack = new Person()
{
Id = 1,
Name = "Jack",
Age = 10,
Data = new byte[] { 0, 1, 2, 3, 4 }
};
connection.Publish("subject", jack);
NeonHelper.WaitFor(() => received != null, TimeSpan.FromSeconds(5));
Assert.True(received.Data == jack);
}
}
/// <summary>
/// Subscribe will create an Asynchronous Subscriber with
/// interest in a given subject, assign the handler, and immediately
/// start receiving messages.
/// </summary>
/// <typeparam name="TMessage">The message type.</typeparam>
/// <param name="connection">The conmnection.</param>
/// <param name="subject">Subject of interest.</param>
/// <param name="qgroup">Name of the queue group.</param>
/// <param name="options">SubscriptionOptions used to create the subscriber.</param>
/// <param name="handler">A message handler to process messages.</param>
/// <returns>A new subscription.</returns>
public static IStanSubscription Subscribe <TMessage>(this IStanConnection connection, string subject, string qgroup, StanSubscriptionOptions options, EventHandler <StanMsgHandlerArgs <TMessage> > handler)
where TMessage : class, IRoundtripData, new()
{
return(connection.Subscribe(subject, qgroup, options,
(sender, args) =>
{
handler?.Invoke(sender, args.Message.ToHandler <TMessage>());
}));
}
private StanObservableSubscription(IStanConnection cn, string subject)
{
if (cn == null)
{
throw new ArgumentNullException(nameof(cn));
}
subscription = cn.Subscribe(subject, OnIncomingMessage);
}
public Program(string[] args)
{
var clientId = "";
var topic = "sample";
if (args.Length > 1)
{
topic = args[1];
}
if (args.Length > 2)
{
clientId = args[2];
}
var cf = new StanConnectionFactory();
var options = StanOptions.GetDefaultOptions();
options.ConnectTimeout = 1000;
options.NatsURL = "nats://*****:*****@localhost:4222";
IStanConnection connection = cf.CreateConnection("test-cluster", clientId, options);
if (args.Length > 0 && args[0] == "send")
{
while (true)
{
connection.Publish(topic, Encoding.UTF8.GetBytes("Hello NATS " + Guid.NewGuid().ToString()));
Console.WriteLine("Message sent to topic: " + topic);
Thread.Sleep(500);
}
}
else
{
var subName = "subscription-1";
if (args.Length > 0)
{
subName = args[0];
}
EventHandler <StanMsgHandlerArgs> eh = (sender, argsMsg) =>
{
var body = Encoding.UTF8.GetString(argsMsg.Message.Data);
// TODO: Handle headers in right way
Console.WriteLine(body);
Thread.Sleep(1000);
argsMsg.Message.Ack();
};
var opts = StanSubscriptionOptions.GetDefaultOptions();
opts.DurableName = subName;
opts.ManualAcks = true;
opts.AckWait = 60000;
opts.MaxInflight = 1;
IStanSubscription subscription = subscription = connection.Subscribe(topic, subName, opts, eh);
}
}
public void Start()
{
_connection = _connectionProvider.GetConnection();
_cancellationTokenSource = new CancellationTokenSource();
Task.Run(() =>
{
var opts = StanSubscriptionOptions.GetDefaultOptions();
opts.DurableName = $"{_config.Value.NatsConnection.ClientId}.Durable";
_subscription = _connection.Subscribe("PostTechnology.EventBus", opts, MessageReceived);
}, _cancellationTokenSource.Token);
}
public NATSOrderRepository()
{
try
{
var cf = new StanConnectionFactory();
var options = StanOptions.GetDefaultOptions();
options.NatsURL = "nats://localhost:4223";
_stanConnection = cf.CreateConnection("test-cluster", CLIENTID, options);
var subOptions = StanSubscriptionOptions.GetDefaultOptions();
subOptions.DeliverAllAvailable();
_stanConnection.Subscribe(EVENTSTREAM_SUBJECT, subOptions, (obj, args) =>
{
try
{
string message = Encoding.UTF8.GetString(args.Message.Data);
string[] messageParts = message.Split('#');
string eventTypeDescriptor =
$"Store.OrderProcessingService.Domain.Events.{messageParts[0]}";
Type eventType = Type.GetType(eventTypeDescriptor);
string eventData = message.Substring(message.IndexOf('#') + 1);
dynamic e = JsonSerializer.Deserialize(eventData, eventType);
if (_eventStreams.ContainsKey(e.OrderNumber))
{
_eventStreams[e.OrderNumber].Add(e);
}
else
{
_eventStreams.Add(e.OrderNumber, new List <BusinessEvent>()
{
e
});
Console.WriteLine($"Order #{e.OrderNumber} found during replay.");
}
}
catch (Exception ex)
{
Console.WriteLine($"Error: {ex.Message}");
}
});
}
catch (Exception ex)
{
Console.WriteLine($"Error: {ex.Message}");
}
}
public Task StartAsync(CancellationToken cancellationToken)
{
if (_logger.IsEnabled(LogLevel.Information))
{
_logger.LogInformation($"Starting hosted service \"{nameof(StanMessageReceiverService)}\".");
}
var task = Task.Run(() =>
{
List <Task> tasks = new List <Task>();
Task t;
_cancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
foreach (var subscription in _messagingEvent.subscriptions)
{
t = Task.Run(() =>
{
var topic = subscription.Key;
var theInstance = (IMessagingEvent)Activator.CreateInstance(_messagingEvent.subscriptions[topic], _serviceProvider);
EventHandler <StanMsgHandlerArgs> msgHandler = (sender, args) =>
{
theInstance.Process(args.Message.Data);
};
//while (!cancellationToken.IsCancellationRequested)
//{
IStanSubscription stanSubscription = _connection.Subscribe(topic, qGroup, sOpts, msgHandler);
//}
}, cancellationToken);
tasks.Add(t);
}
_tasks = tasks.ToArray();
if (_logger.IsEnabled(LogLevel.Information))
{
_logger.LogInformation($"Started hosted service \"{nameof(StanMessageReceiverService)}\".");
}
});
return(task.IsCompleted ? Task.CompletedTask : task);
}
public void Start()
{
// connect to NATS
var natsConnectionFactory = new ConnectionFactory();
_natsConnection = natsConnectionFactory.CreateConnection("nats://localhost:4222");
// connect to STAN
var cf = new StanConnectionFactory();
var natsOptions = StanOptions.GetDefaultOptions();
natsOptions.NatsURL = "nats://localhost:4223";
_stanConnection = cf.CreateConnection("test-cluster", "OrdersQueryService", natsOptions);
// create queries subscription
_natsConnection.SubscribeAsync("store.queries.*", QueryReceived);
// create events subscription
StanSubscriptionOptions stanOptions = StanSubscriptionOptions.GetDefaultOptions();
stanOptions.DurableName = "OrdersQueryService";
_stanConnection.Subscribe("store.events", stanOptions, EventReceived);
}
public IStanSubscription Subscribe(string subject, EventHandler <StanMsgHandlerArgs> handler)
{
return(_stanSubscription = _stanClient.Subscribe(subject, handler));
}