int getLeaseId() {
    return leaseId;
  }
Returns the lease id currently used to hold a lease on this lock or -1 if no thread currently
holds this lock. Caller must synchronize on this token.

@return the id of the current lease on this lock or -1 if none
geode-core/src/main/java/org/apache/geode/distributed/internal/locks/DLockToken.java