Netty入站出站的顺序是一样的，为什么？

网上包括线下书本，都是说入站和出站时相反的执行顺序，但是我执行后顺序时一样的！

netty的版本时4.1.6

执行代码：

  //通道初始化处理器
            ChannelInitializer channelInitializer = new ChannelInitializer<EmbeddedChannel>() {
                @Override
                protected void initChannel(EmbeddedChannel ch) throws Exception {
                    ch.pipeline().addLast(new NettyInHandler1());
                    ch.pipeline().addLast(new NettyInHandler2());
                    ch.pipeline().addLast(new NettyOutHandler1());
                    ch.pipeline().addLast(new NettyOutHandler2());
                }
            };

处理器没有实际处理事务：

    class NettyInHandler1 extends ChannelInboundHandlerAdapter {
        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            super.channelRead(ctx,msg);
            Log.info("》》》》》》进入了NettyInHandler1");
        }
    }

    class NettyInHandler2 extends ChannelInboundHandlerAdapter {
        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            super.channelRead(ctx,msg);
            Log.info("》》》》》》进入了NettyInHandler2");
        }
    }

    class NettyOutHandler1 extends ChannelOutboundHandlerAdapter{
        @Override
        public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
            Log.info("》》》》》》进入了NettyOutHandler1");
            super.write(ctx, msg, promise);
        }
    }

    class NettyOutHandler2 extends ChannelOutboundHandlerAdapter{
        @Override
        public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
            Log.info("》》》》》》进入了NettyOutHandler2");
            super.write(ctx, msg, promise);
        }
    }

输出结果是：

00:00  INFO: 》》》》》》进入了NettyOutHandler2
00:00  INFO: 》》》》》》进入了NettyOutHandler1
00:00  INFO: 》》》》》》进入了NettyInHandler2
00:00  INFO: 》》》》》》进入了NettyInHandler1

结果可以看到，入站和出站时同样的顺序，求大神指点。

super.channelRead(ctx,msg);

Log.info("》》》》》》进入了NettyInHandler1");
这两行代码交换下位置就知道了，看下super.channelRead(ctx,msg)里面具体是怎么实现的；

它内部维护了一个双向链表存放你的handler