Type Alias OffsetCommitCallback 

pub type OffsetCommitCallback = Box<dyn FnOnce(&HashMap<(String, i32), OffsetAndMetadata>, Result<(), &ConsumerError>) + Send>;

The callback of an asynchronous commit. Kafka’s OffsetCommitCallback.

The consumer calls it once with the offsets that the commit sent and the result. An empty map means that the consumer had no position to commit.

Aliased Type

pub struct OffsetCommitCallback(/* private fields */);