private void submitReconnectTaskIfNecessary(Url url) {
        if (configuration.option(BoltClientOption.CONN_RECONNECT_SWITCH)
            && reconnectManager != null) {
            reconnectManager.reconnect(url);
        }
    }
@see io.netty.channel.ChannelInboundHandlerAdapter#channelRegistered(io.netty.channel.ChannelHandlerContext)
src/main/java/com/alipay/remoting/ConnectionEventHandler.java