private async void FetchMessages(CancellationToken token, Func <IEvent, Task> dispatcher, Action <Exception> onError, Action onCompleted, IMessageReader reader, long from)
{
var current = from;
while (!token.IsCancellationRequested)
{
IMessageResult result;
try
{
result = await reader.GetMessagesAsync(token, current, 500);
}
catch (Exception e)
{
onError(e);
token.WaitHandle.WaitOne(1000 * 20);
continue;
}
if (result.HasMessages())
{
foreach (var message in result.Messages)
{
_infoLogger(string.Format("Received message {1} on stream {0}", _stream, message));
IEvent @event;
try
{
@event = _deserializer(message.Value);
_infoLogger(string.Format("Received event {1} on stream {0}", _stream, @event.GetType()));
}
catch (Exception e)
{
onError(e);
continue;
}
await dispatcher(@event);
}
current = result.NextOffset;
_checkpointWriter.Update(current);
}
}
onCompleted();
}
