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)}.

        // expects a message
        final UdtMessage message = (UdtMessage) messageQueue.peek();


        final ByteBuf byteBuf = message.data();


        final int messageSize = byteBuf.readableBytes();


        final long writtenBytes;
        if (byteBuf.nioBufferCount() == 1) {
            writtenBytes = javaChannel().write(byteBuf.nioBuffer());
        } else {

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            buffer = wrappedBuffer(key.getBytes());
            isKey = false;
            if (currentBuffer == null) {
                currentBuffer = wrappedBuffer(buffer, wrappedBuffer("=".getBytes()));
                // continue
                size -= buffer.readableBytes() + 1;
            } else {
                currentBuffer = wrappedBuffer(currentBuffer, buffer, wrappedBuffer("=".getBytes()));
                // continue
                size -= buffer.readableBytes() + 1;
            }

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                // continue
                size -= buffer.readableBytes() + 1;
            } else {
                currentBuffer = wrappedBuffer(currentBuffer, buffer, wrappedBuffer("=".getBytes()));
                // continue
                size -= buffer.readableBytes() + 1;
            }
            if (currentBuffer.readableBytes() >= HttpPostBodyUtil.chunkSize) {
                buffer = fillByteBuf();
                return new DefaultHttpContent(buffer);
            }

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        } else {
            this.delimiters = new ByteBuf[delimiters.length];
            for (int i = 0; i < delimiters.length; i ++) {
                ByteBuf d = delimiters[i];
                validateDelimiter(d);
                this.delimiters[i] = d.slice(d.readerIndex(), d.readableBytes());
            }
            lineBasedDecoder = null;
        }
        this.maxFrameLength = maxFrameLength;
        this.stripDelimiter = stripDelimiter;

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        if ("/".equals(req.getUri())) {
            ByteBuf content = WebSocketServerIndexPage.getContent(getWebSocketLocation(req));
            FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, OK, content);


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


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

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            throw new NullPointerException("value");
        }
        byte [] bytes = value.getBytes(charset.name());
        ByteBuf buffer = wrappedBuffer(bytes);
        if (definedSize > 0) {
            definedSize = buffer.readableBytes();
        }
        setContent(buffer);
    }


    @Override

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        response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");


        if (!close) {
            // There's no need to add 'Content-Length' header
            // if this is the last response.
            response.headers().set(CONTENT_LENGTH, String.valueOf(buf.readableBytes()));
        }


        Set<Cookie> cookies;
        String value = request.headers().get(COOKIE);
        if (value == null) {

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        // Build the response object.
        FullHttpResponse response = new DefaultFullHttpResponse(
                HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buf);


        response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
        response.headers().set(CONTENT_LENGTH, String.valueOf(buf.readableBytes()));


        // Write the response.
        ctx.channel().write(response);
    }

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                    break;
                }


                if (m instanceof ByteBuf) {
                    ByteBuf src = (ByteBuf) m;
                    byteSink.writeBytes(src, src.readerIndex(), src.readableBytes());
                } else {
                    logger.debug(
                            "Discarded outbound message {} that reached at the head of the pipeline. " +
                                    "Please check your pipeline configuration.", m);
                    discardedMessages ++;

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        ByteBuf out = ctx.nextInboundByteBuffer();
        if (!in.isReadable()) {
            callDecode(ctx, in, out);
        }


        int oldOutSize = out.readableBytes();
        try {
            decodeLast(ctx, in, out);
        } catch (Throwable t) {
            if (t instanceof CodecException) {
                ctx.fireExceptionCaught(t);

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