Examples of io.netty.buffer.ByteBuf.readableBytes()

io.netty.buffer.ByteBuf.readableBytes()
Returns the number of readable bytes which is equal to {@code (this.writerIndex - this.readerIndex)}.

         */
        if (!HttpServerResponse.class.isAssignableFrom(msg.getClass())) {
            if (msg instanceof ByteBuf) {
                ByteBuf content = (ByteBuf) msg;
                long contentLength = headers.getContentLength(-1);
                if (-1 != contentLength && contentLength == content.readableBytes()) {
                    if (headerWritten.compareAndSet(false, true)) {
                        // The passed object (to be written) is a ByteBuf instance and it's readable bytes are equal to the
                        // content-length header value set.
                        // So write full response instead of header, content & last HTTP content.
                        return writeFullResponse((ByteBuf) msg);

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      }


      // Skip written length
      buffer.skipBytes(4);


      byte[] array = new byte[buffer.readableBytes()];
      buffer.readBytes(array);
      return array;
    }


    throw createCoercionException(val.getClass(), byte[].class);

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      writer.write(WebSocketServer.getJavascript());


      ByteBuf content = res.content().writeBytes(writer.toString().getBytes(CharsetUtil.UTF_8));


      res.headers().set(CONTENT_TYPE, "text/javascript; charset=UTF-8");
      setContentLength(res, content.readableBytes());
   }


   @Override
   public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
      cause.printStackTrace();

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            ByteBuf content = Unpooled.wrappedBuffer(data);


            FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, OK, content);


            res.headers().set(CONTENT_TYPE, "application/javascript");
            setContentLength(res, content.readableBytes());


            sendHttpResponse(ctx, req, res);
            return;
        }

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    @Override
    protected ClientRequest decode(ChannelHandlerContext ctx, ByteBuf buf) throws Exception {


        ByteBuf in = buf.order(ByteOrder.LITTLE_ENDIAN);


        if (in.readableBytes() < 4) {
            return null;
        }


        in.markReaderIndex();
        int totalLength = in.readInt();

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        if (totalLength > MAX_MESSAGE_SIZE_BYTES) {
            throw new IOException("message too large: " + totalLength + " bytes");
        }


        if (in.readableBytes() < totalLength - lengthFieldLength) {
            in.resetReaderIndex();
            return null; // retry
        }
        in = in.readSlice(totalLength - lengthFieldLength);
        int readable = in.readableBytes();

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        if (in.readableBytes() < totalLength - lengthFieldLength) {
            in.resetReaderIndex();
            return null; // retry
        }
        in = in.readSlice(totalLength - lengthFieldLength);
        int readable = in.readableBytes();
        if (readable != totalLength - lengthFieldLength) {
            throw new IllegalStateException();
        }


        final int requestID = in.readInt();

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    @Override
    protected int doWriteMessages(MessageBuf<Object> buf, boolean lastSpin) throws Exception {
        SctpMessage packet = (SctpMessage) buf.peek();
        ByteBuf data = packet.data();
        int dataLen = data.readableBytes();
        ByteBuffer nioData;
        if (data.nioBufferCount() == 1) {
            nioData = data.nioBuffer();
        } else {
            nioData = ByteBuffer.allocate(dataLen);

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    @Override
    public void inboundBufferUpdated(final ChannelHandlerContext ctx) throws Exception {
        final ByteBuf in = ctx.inboundByteBuffer();


        if (in.readableBytes() < 5) {
            return;
        }


        int packetLength = getEncryptedPacketLength(in);

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        if (packetLength == -1) {
            // Bad data - discard the buffer and raise an exception.
            NotSslRecordException e = new NotSslRecordException(
                    "not an SSL/TLS record: " + BufUtil.hexDump(in));
            in.skipBytes(in.readableBytes());
            ctx.fireExceptionCaught(e);
            setHandshakeFailure(e);
            return;
        }

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