public Task Handle(PlayerInventoryChangedEvent evnt)
{
// TODO: Make fully async and using proper DI
using (var dbContext = ReadModelDbContext.CreateContext(_configuration))
{
var entityRepository = new EntityRepository(dbContext);
entityRepository.Enrich(evnt.InventoryChange);
}
return(Task.CompletedTask);
}
public async Task HandleEvent <TEvent>(TEvent evnt) where TEvent : IEvent
{
using (var dbContext = ReadModelDbContext.CreateContext(_configuration))
{
var dispatcher = new EventDispatcher(dbContext, _logger);
await dispatcher.Handle(evnt);
UpdateState(dbContext, evnt);
try
{
await dbContext.SaveChangesAsync();
}
catch (Exception e)
{
_logger.Error(e, $"Could not commit changes from dispatcher!");
}
}
}
public void Run()
{
using (var dbContext = ReadModelDbContext.CreateContext(_configuration))
{
var initialState = dbContext.ConsumerStates
.Where(s => s.GroupId == _configurationModel.Kafka.GroupId)
.ToList();
if (initialState.Count() > 0)
{
// We have already rehydrated this context; lets continue where we left off
var subscriptions = initialState
.Select(s => new TopicPartitionOffset(s.Topic, s.Partition, s.Offset + 1))
.ToArray();
_logger.Information($"Found existing context state, subscribing to: ${string.Join(", ", subscriptions.Select(s => s.ToString()))}");
_consumer.Subscribe(subscriptions);
}
else
{
// This context needs rehydration; start from beginning
_logger.Information("No existing state found for context; rehydrating..");
_consumer.Subscribe(new TopicPartitionOffset(KafkaTopics.EVENTS, 0, 0));
}
}
}