void markUpdate(Object obj, Operation op) { markUpdate(obj); ArrayList ops = (ArrayList) m_operationMap.get(obj); ops.add(op);
void markUpdate(Object obj) { if (!hasUpdates(obj)) { m_operationMap.put(obj, new ArrayList()); }
    void markUpdate(Object obj, Operation op) {	markUpdate(obj);	ArrayList ops = (ArrayList) m_operationMap.get(obj);	ops.add(op);    }