public void Start(Action <ConsumedMessage> dataSubscriber, Action <Exception> errorSubscriber = null, Action closeAction = null)
{
if (_running)
{
return;
}
var consumerOptions = new ConsumerOptions
{
GroupName = _group,
AutoCommit = _autoCommit
};
do
{
if (_restart)
{
Task.Delay(RestartMsDelay).Wait();
}
lock (Lock)
{
Logger.Info($"Starting balanced consumer {_group} for {_topic}.");
_restart = false;
try
{
var consumer = _client.Consumer(consumerOptions);
_instance = consumer.Join();
_instance.ZookeeperSessionExpired += (sender, args) =>
{
OnZookeeperSessionExpired();
Logger.WarnFormat($"Zookeeper session expired. Shutting down consumer {_group} for {_topic} to restart...");
Restart();
};
_instance.ZookeeperDisconnected += (sender, args) =>
{
OnZookeeperDisconnected();
Logger.WarnFormat($"Zookeeper disconnected. Shutting down consumer {_group} for {_topic} to restart...");
Restart();
};
_instance.Rebalanced += (sender, args) => OnRebalanced(args);
_streams = _instance.Subscribe(_topic, _threads).ToArray();
_streams.ForEach(s =>
{
s.Data(m =>
{
try
{
dataSubscriber(m);
if (!_autoCommit)
{
_instance.Commit(_topic, m.Partition, m.Offset);
}
}
catch (Exception ex)
{
Logger.Error($"Exception in consumer {_group} for {_topic}. Restarting...", ex);
errorSubscriber?.Invoke(ex);
Restart();
}
});
if (errorSubscriber != null)
{
s.Error(errorSubscriber);
}
s.Start();
});
Logger.Info($"Consumer {_instance.Id} started with {_streams.Count()} threads.");
_running = true;
}
catch (Exception ex)
{
Logger.Error($"Exception starting consumer {_group} for {_topic}. Restarting...", ex);
Restart();
continue;
}
}
foreach (var s in _streams)
{
s.Block();
}
Logger.Info($"Consumer {_group} for {_topic} shut down.");
} while (_restart);
closeAction?.Invoke();
_running = false;
}