nacos 自动刷新配置

com.alibaba.nacos.client.config.impl.ClientWorker

private final BlockingQueue<Object> listenExecutebell = new ArrayBlockingQueue<>(1);

  @Override
        public void startInternal() {
            executor.schedule(() -> {
                while (!executor.isShutdown() && !executor.isTerminated()) {
                    try {
　　　　　　　　　　　　　　// listenExecutebell中一直不会没有数据，暂停5秒
                        listenExecutebell.poll(5L, TimeUnit.SECONDS);
                        if (executor.isShutdown() || executor.isTerminated()) {
                            continue;
                        }
                        executeConfigListen();
                    } catch (Throwable e) {
                        LOGGER.error("[ rpc listen execute ] [rpc listen] exception", e);
                    }
                }
            }, 0L, TimeUnit.MILLISECONDS);
            
        }