public async Task StartAsync(CancellationToken cancellationToken)
{
var connection =
await _rabbitMqConnectionFactory.CreateConnectionAsync(_rabbitMqConfiguration.Uri, cancellationToken);
await connection.WithModelAsync(model =>
{
model.ExchangeDeclare(_rabbitMqConfiguration.Exchange, ExchangeType.Fanout);
model.QueueDeclare(_environmentConfiguration.RabbitQueueName, false, false, true, null);
model.QueueBind(_environmentConfiguration.RabbitQueueName, _rabbitMqConfiguration.Exchange, "");
var consume = new EventingBasicConsumer(model);
consume.Received += (obj, @event) =>
{
var msg = CreateRabbitMqMessage(@event);
var domainEvent = _eventJsonSerializer.Deserialize(msg.Message, new Metadata(msg.Headers));
_dispatchToEventSubscribers.DispatchToAsynchronousSubscribersAsync(domainEvent, cancellationToken);
};
model.BasicConsume(_environmentConfiguration.RabbitQueueName, false, consume);
return(Task.CompletedTask);
}, cancellationToken);
}
public async Task SubscribeAsync(string exchange, string queue,
Action <IList <IDomainEvent>, IDomainEventPublisher> action,
IDomainEventPublisher domainEventPublisher, CancellationToken cancellationToken)
{
Uri uri = _configuration.Uri;
IRabbitConnection rabbitConnection = null;
try
{
rabbitConnection = await GetRabbitMqConnectionAsync(uri, cancellationToken).ConfigureAwait(false);
await rabbitConnection.WithModelAsync(model => {
model.ExchangeDeclare(exchange, ExchangeType.Fanout);
model.QueueDeclare(queue, false, false, true, null);
model.QueueBind(queue, exchange, "");
var consume = new EventingBasicConsumer(model);
consume.Received += (obj, @event) => {
var msg = CreateRabbitMqMessage(@event);
var domainEvent = _eventJsonSerializer.Deserialize(msg.Message, new Metadata(msg.Headers));
_dispatchToEventSubscribers.DispatchToAsynchronousSubscribersAsync(domainEvent, cancellationToken);
};
model.BasicConsume(queue, false, consume);
return(Task.CompletedTask);
}, cancellationToken);
}
catch (OperationCanceledException)
{
throw;
}
catch (Exception e)
{
if (rabbitConnection != null)
{
using (await _asyncLock.WaitAsync(CancellationToken.None).ConfigureAwait(false))
{
rabbitConnection.Dispose();
_connections.Remove(uri);
}
}
_log.Error(e, "Failed to subscribe to RabbitMQ");
throw;
}
}