forkjoin使用_forkjoin与线程池区别

全栈程序员-站长 • 2022年9月20日下午8:00 • 未分类 • 阅读 0

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ForkJoinPool infoForkJoinPool = new ForkJoinPool(Runtime.getRuntime().availableProcessors() * 2);

ForkJoinTask<Map<Long,InfoVO>> forkJoinTask = ThreadPoolManage.infoForkJoinPool.submit(new PriceTask(skuIds, 0, skuIds.size(),infoSoaService));

Map<Long,InfoVO> infoVOMap = forkJoinTask.join();


 /** * 多任务查询 */
    public class PriceTask extends RecursiveTask<Map<Long,InfoVO>> { 
   
        /** * sku集合 */
        private Set<Long> skuIds;
        /** * */
        private InfoSoaService infoSoaService;
        /** * 开始 */
        private int start;
        /** * 最大 */
        private int end;
        /** * 单次最多查询sku数量 */
        static final int THRESHOLD = 20;

        public PriceTask(Set<Long> skuIds, int start, int end,InfoSoaService infoSoaService) { 
   
            this.skuIds = skuIds;
            this.start = start;
            this.end = end;
            thisinfoSoaService = infoSoaService;
        }

        @Override
        protected Map<Long, InfoVO> compute() { 
   
            if (end - start <= THRESHOLD) { 
   
                List<Long> skuList = new ArrayList<>(skuIds);
                Response<Map<Long, InfoVO>> bySkuIds = infoSoaService.getInfoBySkuIds(buildCaller(), new HashSet<>(skuList.subList(start, end)));
                return new HashMap<>(bySkuIds.getData());
            }
            int middle = (end + start) / 2;
            PriceTask left = new PriceTask(skuIds, start, middle, infoSoaService);
            PriceTask right = new PriceTask(skuIds, middle, end, infoSoaService);
            invokeAll(left, right);
            Map<Long,InfoVO> resultMap = new HashMap<>();
            Map<Long, InfoVO> infoVOLeftMap = left.join();
            Map<Long, InfoVO> infoVORightMap = right.join();
            resultMap.putAll(infoVOLeftMap);
            resultMap.putAll(infoVORightMap);
            return resultMap;
        }
    }