code: private EventLoopPool getOrCreateEventLoopPool(EventLoop eventLoop) {
          final EventLoopPool pool = eventLoopPools.get(eventLoop);
          if (pool != null) {
              return pool;
          }
          return eventLoopPools.computeIfAbsent(eventLoop, e -> new EventLoopPool());
      }
docs: Get or create the pool that is bound to the given eventloop.
  
  @param eventLoop netty event loop
  @return EventLoopPool