code: public static List<ConnectionSpecWrapper> getConnectionSpecWrappers(String env) {
          return connectionWrappers.get(env) == null? new ArrayList<>() :connectionWrappers.get(env);
      }
docs: Provides a list of all connection wrappers corresponding to a given environment.
  
  @param env name of environment, such as "development", "production", etc.
  
  @return  a list of all connection wrappers corresponding to a given environment.