public Catalog getCatalogFromCache(String name) {
    Catalog cat = null;
    try {
      cacheLock.readLock().lock();
      if (catalogCache.get(name) != null) {
        cat = catalogCache.get(name).deepCopy();
      }
    } finally {
      cacheLock.readLock().unlock();
    }
    return cat;
  }
Common method to refresh cache constraint
@param constraints list of constraints to update
@param mn Constraint type
@return Since memory constraint is handled by cache eviction policy.
Hence this method will always return true if correct constraint type passed.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/cache/SharedCache.java