docs: public Logger getLogger(String name) {
          Logger simpleLogger = loggerMap.get(name);
          if (simpleLogger != null) {
              return simpleLogger;
          } else {
              Logger newInstance = new SimpleLogger(name);
              Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
              return oldInstance == null ? newInstance : oldInstance;
          }
      }