EvictionController getOrCreatePRLRUStats(PlaceHolderDiskRegion dr) {
    String prName = dr.getPrName();
    EvictionController result;
    synchronized (prEvictionControllerMap) {
      result = prEvictionControllerMap.get(prName);
      if (result == null) {
        result = AbstractEvictionController.create(dr.getEvictionAttributes(), dr.getOffHeap(),
            dr.getStatisticsFactory(), prName);
        prEvictionControllerMap.put(prName, result);
      }
    }
    return result;
  }
Lock used to synchronize access to the init file. This is a lock rather than a synchronized
block because the backup tool needs to acquire this lock.
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreImpl.java