code: public void storeKeyspaceInstance(Keyspace keyspace)
      {
          if (keyspaceInstances.containsKey(keyspace.getName()))
              throw new IllegalArgumentException(String.format("Keyspace %s was already initialized.", keyspace.getName()));
  
          keyspaceInstances.put(keyspace.getName(), keyspace);
      }
docs: Store given Keyspace instance to the schema
  
  @param keyspace The Keyspace instance to store
  
  @throws IllegalArgumentException if Keyspace is already stored