컬렉션에 있는 객체의 속성 요소에 따라 지정된 양만큼 그룹화

컬렉션에 있는 객체의 속성 요소에 따라 지정된 양만큼 그룹화

컬렉션 분할

public class CollectionsSplitFactory {
    public void buildCollections(List<T> originCollections, String propName, int batchSize){
        Map<Integer, List<String>> objsMap= splitCollectionsByPropName(originCollections, propName, batchSize);
        for(List<String> obj : objsMap.values()){
            // 
        }
    }

    private Map<Integer, List<String>> splitCollectionsByPropName(List<T> originCollections, String propName, int batchSize){
        Map<Integer, List<String>> objsMap = new HashMap<Integer, List<String>>();
            // 
            List<String> objs = originCollections.pluck(propName);
            int size = (int)Math.ceil((double)objs.size()/batchSize);
            for(int i=0; i<size; i++){
                int startInx = batchSize*i;
                int endInx = batchSize*(i+1)<objs.size()?batchSize*(i+1):objs.size();
                List<String> subList = objs.subList(startInx, endInx);
                objsMap.put(i, subList);
            }
            return objsMap;
    }
}