public async Task <IDisposable> SubscribeAsync <TMessage>(Func <MessagingEnvelope <TMessage>, Task> handler,
MessagingSubscriberOptions options = null,
CancellationToken cancellationToken = default)
{
var topicName = _topicRegistry.GetTopicForName(options?.TopicName) ??
_topicRegistry.GetTopicForMessageType(typeof(TMessage));
async Task MsgHandler(byte[] messageData)
{
_logger.LogDebug("Messaging subscriber received message from subject {Subject}", topicName);
try
{
var messageEnvelope = _messageSerDes.DeserializeMessageEnvelope <TMessage>(messageData);
await handler(messageEnvelope);
}
catch (Exception ex)
{
_logger.LogError(
"Messaging consumer encountered an error when handling a message from subject {Subject}.\n {Error}",
topicName, ex);
//TODO: push to DLQ
}
}
return(await _messagingTransport.SubscribeAsync(topicName, MsgHandler, options?.Transport, cancellationToken));
}
public Task SubscribeAsync(Func <MessagingEnvelope <TMessage>, Task> handler, CancellationToken cancellationToken = default, string topicName = null, MessagingSubscriberOptions options = null)
{
_handlers.Add(handler);
if (!_subscribedToTopic)
{
lock (lockObj)
{
if (!_subscribedToTopic)
{
_subscribedToTopic = true;
_topicName = _topicRegistry.GetTopicForName(topicName) ??
_topicRegistry.GetTopicForMessageType(typeof(TMessage));
_subscriberOptions = options;
_topicSubscriber.SubscribeAsync(_topicName, HandleMessage, cancellationToken, options);
}
}
}
return(Task.CompletedTask);
}
public Task <IDisposable> SubscribeAsync <TMessage>(Func <MessagingEnvelope <TMessage>, Task> handler,
MessagingSubscriberOptions options = null,
CancellationToken cancellationToken = default)
=> _busSubscriber.SubscribeAsync(handler, options, cancellationToken);