public static void AddKafkaConsumer(this ContainerBuilder builder, Action <SubscriberConfig> configurator)
{
Guard.NotNull(configurator, nameof(configurator));
var config = new SubscriberConfig();
// Consumer
configurator(config);
var events = config.EventAssemblies
.SelectMany(a => a.GetTypes())
.Where(t => t.IsAssignableTo <Event>());
foreach (var type in events)
{
if (type.GetConstructors().Any(c => c.GetParameters().Count() == 0))
{
var handlerType = typeof(IMessageHandler <>).MakeGenericType(type);
var hasHandler = config
.EventAssemblies
.Any(ass => ass.GetTypes().Any(ty => handlerType.IsAssignableFrom(ty)));
if (hasHandler)
{
config.Topics.Add(type.FullName);
}
}
}
builder.RegisterInstance(Options.Create(config));
builder.RegisterType <KafkaListenerService>()
.As <IHostedService>()
.InstancePerDependency();
builder
.RegisterAssemblyTypes(config.EventAssemblies)
.AsClosedTypesOf(typeof(IMessageHandler <>))
.AsImplementedInterfaces()
.InstancePerDependency();
builder
.RegisterType <HandlerInvoker>()
.SingleInstance();
}
public KafkaListenerService(
ILogger <KafkaListenerService> logger,
HandlerInvoker handlerFactory,
SubscriberConfig subscriberConfig)
{
if (!subscriberConfig.IsValid)
{
throw new ArgumentException(nameof(subscriberConfig));
}
this._logger = logger;
this._config = subscriberConfig;
this._handlerFactory = handlerFactory;
if (subscriberConfig.Topics == null || !subscriberConfig.Topics.Any())
{
_logger.LogWarning("No topics found to subscribe");
}
else
{
_logger.LogInformation($"subscribing to {JsonConvert.SerializeObject(subscriberConfig.Topics)}");
}
}
