Consumer constructor is marked internal

Description

Confluent.Kafka 1.0 RC4

Consumer has one constructor that is marked as internal, making it impossible to extend. Is this intended? This forces a developer to wrap the class to associate data with the consumer (changing all the code from consumer.Consume() to consumerWrapper.Consumer.Consume(), for example).

One option is to make the constructor public.

Another option is to seal the class or mark it as internal, only allowing the interface to be used externally, making it clear that the class cannot be inherited.

How to reproduce

The following will not build because the constructor is marked internal.

public class ExtendedConsumer<TKey,TValue> : Consumer<TKey,TValue>
{
    public ExtendedConsumer(ConsumerBuilder<TKey,TValue> builder):base(builder){};
}

Possibly related issues:

https://github.com/confluentinc/confluent-kafka-dotnet/issues/151 https://github.com/confluentinc/confluent-kafka-dotnet/issues/777

[mhowlett]

#888 actions this issue

[dbrownxc]

Understood. Thanks for the explanation!