Combine the consumer control and a stream completion signal materialized values into
one, so that the stream can be stopped in a controlled way without losing
commits.
Combine the consumer control and a stream completion signal materialized values into
one, so that the stream can be stopped in a controlled way without losing
commits.
Combine the consumer control and a stream completion signal materialized values into
one, so that the stream can be stopped in a controlled way without losing
commits.
Combine the consumer control and a stream completion signal materialized values into
one, so that the stream can be stopped in a controlled way without losing
commits.
For use in the toMat combination of materialized values.