/**
* 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);
}
/**
* Adds the specified element to this set if it is not already present. More formally, adds the
* specified element <tt>e</tt> to this set if the set contains no element <tt>e2</tt> such that
* <tt>(e==null ? e2==null : e.equals(e2))</tt>. If this set already contains
* the element, the call leaves the set unchanged and returns <tt>false</tt>.
*
* @param e element to be added to this set
* @return <tt>true</tt> if this set did not already contain the specified element
*/
public boolean add(E e) {
return al.addIfAbsent(e);
}