@Override
    public LowLevelResultListener<R> registerLowLevelResultListener(
            LowLevelResultListener<R> listener) {

        return super.registerLowLevelResultListener(listener);
    }
Used to register a listener for the event of receiving a low-level result
from the server side.

@param listener
           listener to be registered. If null, a "none" listener will be
           set.
@return the previously registered listener. The return value is never
        null.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/document/ItemCollection.java