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

io.netty.buffer.ByteBuf.writableBytes()
Returns the number of writable bytes which is equal to {@code (this.capacity - this.writerIndex)}.

                expandReadBuffer(byteBuf);


                readInProgress = true;
                if (byteBuf.nioBufferCount() == 1) {
                    // Get a ByteBuffer view on the ByteBuf
                    ByteBuffer buffer = byteBuf.nioBuffer(byteBuf.writerIndex(), byteBuf.writableBytes());
                    javaChannel().read(
                            buffer, config.getReadTimeout(), TimeUnit.MILLISECONDS, this, READ_HANDLER);
                } else {
                    ByteBuffer[] buffers = byteBuf.nioBuffers(byteBuf.writerIndex(), byteBuf.writableBytes());
                    if (buffers.length == 1) {

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                    // Get a ByteBuffer view on the ByteBuf
                    ByteBuffer buffer = byteBuf.nioBuffer(byteBuf.writerIndex(), byteBuf.writableBytes());
                    javaChannel().read(
                            buffer, config.getReadTimeout(), TimeUnit.MILLISECONDS, this, READ_HANDLER);
                } else {
                    ByteBuffer[] buffers = byteBuf.nioBuffers(byteBuf.writerIndex(), byteBuf.writableBytes());
                    if (buffers.length == 1) {
                        javaChannel().read(
                                buffers[0], config.getReadTimeout(), TimeUnit.MILLISECONDS, this, READ_HANDLER);
                    } else {
                        javaChannel().read(

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                        if (data.hasMemoryAddress()) {
                            // has a memory address so use optimized call
                            remoteAddress = Native.recvFromAddress(
                                    fd, data.memoryAddress(), writerIndex, data.capacity());
                        } else {
                            ByteBuffer nioData = data.internalNioBuffer(writerIndex, data.writableBytes());
                            remoteAddress = Native.recvFrom(
                                    fd, nioData, nioData.position(), nioData.limit());
                        }


                        if (remoteAddress == null) {

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            this.allocHandle = allocHandle = config.getRecvByteBufAllocator().newHandle();
        }
        ByteBuf data = allocHandle.allocate(config.getAllocator());
        boolean free = true;
        try {
            ByteBuffer nioData = data.internalNioBuffer(data.writerIndex(), data.writableBytes());
            int pos = nioData.position();
            InetSocketAddress remoteAddress = (InetSocketAddress) ch.receive(nioData);
            if (remoteAddress == null) {
                return 0;
            }

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            this.allocHandle = allocHandle = config().getRecvByteBufAllocator().newHandle();
        }
        ByteBuf buffer = allocHandle.allocate(config().getAllocator());
        boolean free = true;
        try {
            ByteBuffer data = buffer.internalNioBuffer(buffer.writerIndex(), buffer.writableBytes());
            int pos = data.position();


            MessageInfo messageInfo = ch.receive(data, null, notificationHandler);
            if (messageInfo == null) {
                return 0;

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                int totalReadAmount = 0;
                for (;;) {
                    // we use a direct buffer here as the native implementations only be able
                    // to handle direct buffers.
                    byteBuf = allocHandle.allocate(allocator);
                    int writable = byteBuf.writableBytes();
                    int localReadAmount = doReadBytes(byteBuf);
                    if (localReadAmount <= 0) {
                        // not was read release the buffer
                        byteBuf.release();
                        close = localReadAmount < 0;

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            try {
                int totalReadAmount = 0;
                boolean readPendingReset = false;
                do {
                    byteBuf = allocHandle.allocate(allocator);
                    int writable = byteBuf.writableBytes();
                    int localReadAmount = doReadBytes(byteBuf);
                    if (localReadAmount <= 0) {
                        // not was read release the buffer
                        byteBuf.release();
                        close = localReadAmount < 0;

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                }
                ByteBuf buffer = allocHandle.allocate(config().getAllocator());
                boolean free = true;


                try {
                    ByteBuffer data = buffer.nioBuffer(buffer.writerIndex(), buffer.writableBytes());
                    MessageInfo messageInfo = ch.receive(data, null, notificationHandler);
                    if (messageInfo == null) {
                        return readMessages;
                    }

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                int totalReadAmount = 0;
                for (;;) {
                    // we use a direct buffer here as the native implementations only be able
                    // to handle direct buffers.
                    byteBuf = allocHandle.allocate(allocator);
                    int writable = byteBuf.writableBytes();
                    int localReadAmount = doReadBytes(byteBuf);
                    if (localReadAmount <= 0) {
                        // not was read release the buffer
                        byteBuf.release();
                        close = localReadAmount < 0;

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            }


            final long contentLength = contentLength(msg);
            if (state == ST_CONTENT_NON_CHUNK) {
                if (contentLength > 0) {
                    if (buf != null && buf.writableBytes() >= contentLength && msg instanceof HttpContent) {
                        // merge into other buffer for performance reasons
                        buf.writeBytes(((HttpContent) msg).content());
                        out.add(buf);
                    } else {
                        if (buf != null) {

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