Grants the given number of message credits to the sender.
For use when {@link #setPrefetch(int)} has been used to disable automatic prefetch credit handling.
@param credits
the credits to flow
@return the receiver
@throws IllegalStateException
if prefetch is non-zero, or an existing drain operation is not yet complete
Grants the given number of message credits to the sender.
For use when {@link #setPrefetch(int)} has been used to disable automatic prefetch credit handling.
@param credits the credits to flow @return the receiver @throws IllegalStateException if prefetch is non-zero, or an existing drain operation is not yet complete