boolean isLeaseHeld() {
      return lessee != null && leaseId > -1;
    }
Returns true if this lock is currently leased out.
<p>
Caller must synchronize on this grant token.

@return true if this lock is currently leased out guarded.By this
geode-core/src/main/java/org/apache/geode/distributed/internal/locks/DLockGrantor.java