private List <IEventHandlerFactory> GetOrCreateHandlerFactories(Type eventType)
{
return(HandlerFactories.GetOrAdd(
eventType,
type =>
{
var eventName = EventNameAttribute.GetName(type);
EventTypes[eventName] = type;
return new List <IEventHandlerFactory>();
}
));
}
public override IDisposable Subscribe(Type eventType, IEventHandlerFactory factory)
{
var handlerFactories = GetOrCreateHandlerFactories(eventType);
handlerFactories.Add(factory);
if (handlerFactories.Count == 1) //TODO: Multi-threading!
{
var eventName = EventNameAttribute.GetName(eventType);
using (var channel = ConnectionPool.Get().CreateModel()) //TODO: Connection name per event!
{
channel.QueueBind(
queue: RabbitMqDistributedEventBusOptions.ClientName,
exchange: RabbitMqDistributedEventBusOptions.ExchangeName,
routingKey: eventName
);
}
}
return(new EventHandlerFactoryUnregistrar(this, eventType, factory));
}
public override Task PublishAsync(Type eventType, object eventData)
{
var eventName = EventNameAttribute.GetName(eventType);
var body = Serializer.Serialize(eventData);
using (var channel = ConnectionPool.Get().CreateModel()) //TODO: Connection name per event!
{
//TODO: Other properties like durable?
channel.ExchangeDeclare(RabbitMqDistributedEventBusOptions.ExchangeName, "");
var properties = channel.CreateBasicProperties();
properties.DeliveryMode = 2; //persistent
channel.BasicPublish(
exchange: RabbitMqDistributedEventBusOptions.ExchangeName,
routingKey: eventName,
mandatory: true,
basicProperties: properties,
body: body
);
}
return(Task.CompletedTask);
}