code: private void handleServerTextChannel(JsonNode jsonChannel) {
          long channelId = jsonChannel.get("id").asLong();
          api.getTextChannelById(channelId).map(c -> ((ServerTextChannelImpl) c)).ifPresent(channel -> {
              String oldTopic = channel.getTopic();
              String newTopic = jsonChannel.has("topic") && !jsonChannel.get("topic").isNull()
                      ? jsonChannel.get("topic").asText() : "";
              if (!oldTopic.equals(newTopic)) {
                  channel.setTopic(newTopic);
  
                  ServerTextChannelChangeTopicEvent event =
                          new ServerTextChannelChangeTopicEventImpl(channel, newTopic, oldTopic);
  
                  api.getEventDispatcher().dispatchServerTextChannelChangeTopicEvent(
                          (DispatchQueueSelector) channel.getServer(), channel.getServer(), channel, event);
              }
  
              boolean oldNsfwFlag = channel.isNsfw();
              boolean newNsfwFlag = jsonChannel.get("nsfw").asBoolean();
              if (oldNsfwFlag != newNsfwFlag) {
                  channel.setNsfwFlag(newNsfwFlag);
                  ServerChannelChangeNsfwFlagEvent event =
                          new ServerChannelChangeNsfwFlagEventImpl(channel, newNsfwFlag, oldNsfwFlag);
  
                  api.getEventDispatcher().dispatchServerChannelChangeNsfwFlagEvent(
                          (DispatchQueueSelector) channel.getServer(), null, channel.getServer(), channel, event);
              }
  
              int oldSlowmodeDelay = channel.getSlowmodeDelayInSeconds();
              int newSlowmodeDelay = jsonChannel.get("rate_limit_per_user").asInt(0);
              if (oldSlowmodeDelay != newSlowmodeDelay) {
                  channel.setSlowmodeDelayInSeconds(newSlowmodeDelay);
                  ServerTextChannelChangeSlowmodeEvent event =
                          new ServerTextChannelChangeSlowmodeEventImpl(channel, oldSlowmodeDelay, newSlowmodeDelay);
  
                  api.getEventDispatcher().dispatchServerTextChannelChangeSlowmodeEvent(
                          (DispatchQueueSelector) channel.getServer(), channel.getServer(), channel, event
                  );
              }
          });
      }
docs: Handles a server text channel update.
  
  @param jsonChannel The json channel data.