Method track

cmd/Tracker.java:19–26

(Object v)

        return instance;
    }
    public synchronized long track(Object v) {
        if (v == null) {
            return 0;
        }
        this.maxKey += 1;
        this.mapTable.put(this.maxKey, v);
        return this.maxKey;
    }
    public synchronized void untrack(long v) {
        if (v == 0) {
            return;