protected boolean isGranted(boolean checkForExpiration) {
      if (checkForExpiration) {
        checkForExpiration();
      }
      return isLeaseHeld();
    }
Returns true if this grant token is currently granted.
<p>
Caller must synchronize on this grant token.

Concurrency: protected by synchronization of *this* DLockGrantToken

@param checkForExpiration true if expiration should be attempted before checking if this
       grant token is currently granted
@return true if this grant token is currently granted
geode-core/src/main/java/org/apache/geode/distributed/internal/locks/DLockGrantor.java