public static void incRefCount(AbstractRegionEntry re) {
    TXManagerImpl mgr = currentInstance.get();
    if (mgr != null) {
      mgr.refCountMap.create(re, incCallback, null, null, true);
    }
  }
Returns true if refCount goes to 0.
geode-core/src/main/java/org/apache/geode/internal/cache/TXManagerImpl.java