}


    protected abstract void doSendFragment ( byte[] buf, int off, int length ) throws IOException;


    protected abstract int doReceiveFragment ( byte[] buf ) throws IOException;


    protected abstract int doSendReceiveFragment ( byte[] out, int off, int length, byte[] inB ) throws IOException;


    @Override
    public void close () throws IOException {
        this.state = 0;
    }

        return binding.toString();
    }

    protected abstract void doSendFragment(byte[] buf,
                int off,
                int length,
                boolean isDirect) throws IOException;
    protected abstract void doReceiveFragment(byte[] buf, boolean isDirect) throws IOException;
    public abstract void close() throws IOException;