protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
_logger.LogInformation("Starting event projector for type {EventType}", typeof(TEvent).Name);
var topic = _topicNamingConvention.GetTopicName <TEvent>();
while (!stoppingToken.IsCancellationRequested)
{
// For some reason, without adding another "await" statement, the below async stream blocks
// the main thread and won't start up the application. This is a workaround
await Task.Delay(10, stoppingToken);
try
{
await foreach (var msg in _streamConsumer.ConsumeAsync(topic, new ConsumerOptions()).WithCancellation(stoppingToken))
{
var obj = JsonConvert.DeserializeObject <TEvent>(Encoding.UTF8.GetString(msg));
var tasks = new List <Task>();
foreach (IEventApplier <TEvent> applier in _eventAppliers)
{
tasks.Add(applier.ApplyAsync(obj));
}
await Task.WhenAll(tasks);
}
}
catch (Exception e)
{
_logger.LogCritical("Projector {ProjectorName} failed. Reason: {Message}. Stack Trace: {StackTrace}",
GetType().FullName, e.Message, e.StackTrace);
return;
}
}
}
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
_logger.LogInformation("Starting event consumer for type {EventType}", typeof(TEvent).Name);
var topic = _topicNamingConvention.GetTopicName <TEvent>();
while (!stoppingToken.IsCancellationRequested)
{
try
{
var consumer = (IStreamConsumer)_serviceProvider.GetService(typeof(IStreamConsumer));
// For some reason, without adding another "await" statement, the below async stream blocks
// the main thread and won't start up the application. This is a workaround
await Task.Delay(10, stoppingToken);
await foreach (var msg in consumer.ConsumeAsync(topic).WithCancellation(stoppingToken))
{
_logger.LogDebug("Consumed message, length: {ByteLength}", msg.Length);
_logger.LogDebug("Consumed message string: {ByteString}", Encoding.UTF8.GetString(msg));
var obj = JsonConvert.DeserializeObject <TEvent>(Encoding.UTF8.GetString(msg));
_logger.LogDebug("Consumed message id: {Id}", obj.Id);
var handler = (IEventHandler <TEvent>)_serviceProvider.GetService(typeof(IEventHandler <TEvent>));
await handler.HandleAsync(obj);
}
}
catch (Exception e)
{
_logger.LogCritical("Consumer {ConsumerName} failed. Reason: {Message}. Stack Trace: {StackTrace}",
GetType().FullName, e.Message, e.StackTrace);
return;
}
}
}
public void Should_be_able_to_convert_class_name_to_kebab_case()
{
string name = _topicNamingConvention.GetTopicName <KebabCaseTopicNamingConventionSpecs>();
Assert.That(name, Is.EqualTo("kebab-case-topic-naming-convention-specs"));
}
public async Task Add(int num)
{
_logger.LogInformation("Adding number...");
await _distributedLog.AppendAsync(_namingConvention.GetTopicName <NumberAdded>(), new NumberAdded { Num = num });
}
