confmaster/src/main/java/com/navercorp/nbasearc/confmaster/io/EventSelector.java
public ElapsedTime process() {
        try {
            long start = System.currentTimeMillis();
            ioProcess();
            long ioDone = System.currentTimeMillis();
            loopProcess();
            long end = System.currentTimeMillis();

            return new ElapsedTime(start, ioDone, end);
        } catch (Exception e) {
            Logger.error("-ERR error occurs in hbMain", e);
        }

        return null;
    }
public ElapsedTime process() {
        try {
            long start = System.currentTimeMillis();
            ioProcess();
            long ioDone = System.currentTimeMillis();
            loopProcess();
            long end = System.currentTimeMillis();

            return new ElapsedTime(start, ioDone, end);
        } catch (Exception e) {
            Logger.error("-ERR error occurs in hbMain", e);
        }

        return null;
    }
Main loop of nio

@return elapsed time