private async Task RunConsuming(SubscriptionConfiguration config, CancellationToken cancellationToken)
{
while (!cancellationToken.IsCancellationRequested)
{
try
{
_logger.LogInformation(
$"Subscription starting. Topic {config.Settings.Topic}. Group {config.Settings.Config.GroupId}");
using var consumer = CreateConsumer(config);
try
{
await consumer.ConsumeAsync(cancellationToken);
}
finally
{
consumer.Close();
}
}
catch (OperationCanceledException)
{
_logger.LogInformation($"Subscription stopped. Topic: {config.Settings.Topic}.");
}
catch (Exception ex)
{
_logger.LogError(ex, $"Subscription failed. Topic: {config.Settings.Topic}.");
}
}
}
private KafkaConsumer CreateConsumer(SubscriptionConfiguration config)
{
return(new KafkaConsumer(
_observerFactoryResolver.Resolve(config),
config.Serializer,
config.Settings,
_loggerFactory));
}
public EndpointConfiguration AddSubscription(SubscriptionConfiguration config)
{
if (config == null)
{
throw new ArgumentNullException(nameof(config));
}
_subscriptions.Add(config);
return(this);
}
public EndpointConfiguration AddSubscription(
ConsumerSettings settings,
IEventDeserializer serializer,
HandlerConfiguration handlerConfig = default,
bool skipUnknownEventTypes = true,
int instances = 1)
{
var subscription = new SubscriptionConfiguration(
settings,
serializer,
handlerConfig,
skipUnknownEventTypes,
instances);
_subscriptions.Add(subscription);
return(this);
}
public EndpointConfiguration AddBatchSubscription(
ConsumerSettings settings,
BatchConfiguration batchConfig,
IEventDeserializer serializer,
HandlerConfiguration handlerConfig = default,
bool skipUnknownEventTypes = true,
int instances = 1,
bool isLongRunning = true)
{
var subscription = new SubscriptionConfiguration(
isLongRunning ? settings.ToLongRunning() : settings,
batchConfig,
serializer,
handlerConfig,
skipUnknownEventTypes,
instances);
_subscriptions.Add(subscription);
return(this);
}
public ObserverFactory(SubscriptionConfiguration configuration, IEventHandlerFactory eventHandlerFactory)
{
_configuration = configuration;
_eventHandlerFactory = eventHandlerFactory;
}