Question

While reading here and creating a large Object to send and receive using JsonWriter and JsonReader. I wanted to keep track of total bytes sent.

Answer 1

There’s nothing in JsonWriter or JsonReader that is going to provide that for you.

Really the only way to do it would be to wrap/extend the Reader or Writer you’re currently passing to JsonReader/JsonWriter and keep track of the bytes being read/written in/out.

Edit to add: As an example you could do something like:

class MyWriterWrapper extends Writer {

    private Writer realWriter;
    private int bytesWritten;

    public MyWriterWrapper(Writer realWriter) {
        super(); 
        this.realWriter = realWriter;
    }

    public int getBytesWritten() {
        return bytesWritten;
    }

    @Override
    public Writer append(CharSequence csq) throws IOException {
         realWriter.append(csq);
         bytesWritten += csq.length();
         return this;
    }

    // Implement/Override all other Writer methods the same way

}

It’d be a lot cleaner if Writer was an interface but … meh, what can you do. If you know you’re only ever going to use one type of Writer (say, a BufferedWriter) you could extend that, override all the methods and re-call the methods on this instead of the private realWriter instance passed in via the constructor.