如果我非要写更新操作，我写的这个可以吗？老师

public void update(String key, Set<Long> value) {
            log.info("keyword index can not support update");
            Set<Long> unitIdSet=CommonUtils.getorCreate(key,keywordUnitMap,ConcurrentSkipListSet::new);
            Iterator<Long> iterator=unitIdSet.iterator();
            while(iterator.hasNext()){
                Set<String> keyword=unitKeywordMap.get(iterator.next());
                keyword.remove(key);
            }

            for(Long unitId:value){
                Set<String> keywordSet=CommonUtils.getorCreate(unitId,unitKeywordMap,ConcurrentSkipListSet::new);
                keywordSet.add(key);
            }
           keywordUnitMap.put(key,value);

    }