hi,I see the  code for method setBytes in class com.alibaba.dubbo.remoting.transport.netty4.NettyBackedChannelBuffer.java which is below,is there a problem ?

![image](https://user-images.githubusercontent.com/20593632/46648646-90eaba00-cbc8-11e8-896d-9a1d235d7e0b.png)


@Override
    public void getBytes(int index, byte[] dst, int dstIndex, int length) {
        buffer.getBytes(index, dst, dstIndex, length);
    }
    @Override
    public void getBytes(int index, ByteBuffer dst) {
        buffer.getBytes(index, dst);
    }
    @Override
    public void getBytes(int index, ChannelBuffer dst, int dstIndex, int length) {
        
        byte[] data = new byte[length];
        buffer.getBytes(index, data, 0, length);
        dst.setBytes(dstIndex, data, 0, length);
    }
    @Override
    public void getBytes(int index, OutputStream dst, int length) throws IOException {
        buffer.getBytes(index, dst, length);
    }
    @Override
    public boolean isDirect() {
        return buffer.isDirect();
    }
    @Override
    public void setByte(int index, int value) {
        buffer.setByte(index, value);
    }
    @Override
    public void setBytes(int index, byte[] src, int srcIndex, int length) {
        buffer.setBytes(index, src, srcIndex, length);