/**
* Adds group reservation to this partition.
*
* @param r Reservation.
* @return {@code false} If such reservation already added.
*/
public boolean addReservation(GridDhtPartitionsReservation r) {
assert state.getReference() != EVICTED : "we can reserve only active partitions";
assert state.getStamp() != 0
: "partition must be already reserved before adding group reservation";
return reservations.addIfAbsent(r);
}
