耗時接口的性能優化

1. 異步并發執行，CompletableFuture，比如查詢商品詳情接口，需要查各種表，返回一個大的DTO，可以同時查 item、sku、spu、gnu，然后拼裝成一個DTO

  ProductUnitStructure productUnitStructure = productUnitEsSearch.searchByCondition(conditionMap);
    if (isEmpty(productUnitStructure)) {
        return RpcResponseResultUtil.successNoData();
    }
    Long gnuId = productUnitStructure.getGnuId();
    String spuCode = productUnitStructure.getSpuCode();
    String skuCode = productUnitStructure.getSkuCode();

    CompletableFuture<ProductStructure> productTask = CompletableFuture.supplyAsync(() -> productEsSearch.searchOneProductByCode(skuCode));
    CompletableFuture<ProductDrugStructure> gnuTask = CompletableFuture.supplyAsync(() -> drugGnuEsSearch.searchByGnuId(gnuId));
    CompletableFuture<ProductTemplateStructure> spuTask = CompletableFuture.supplyAsync(() -> productTemplateEsSearch.searchByCode(spuCode));
    CompletableFuture<Void> all = CompletableFuture.allOf(productTask, gnuTask, spuTask);
    all.get();

    ProductStructure productStructure = productTask.get();
    ProductTemplateStructure productTemplateStructure = spuTask.get();
    ProductDrugStructure productDrugStructure = gnuTask.get();
    if (ObjectUtils.isNotEmpty(productStructure)) {
        BeanCopyManualUtils.copySkuStructureToProductDetailDTO(productStructure, productDetailDTO);
    }
    if (ObjectUtils.isNotEmpty(productTemplateStructure)) {
        BeanCopyManualUtils.copySpuStructureToProductDetailDTO(productTemplateStructure, productDetailDTO);
    }
    if (ObjectUtils.isNotEmpty(productDrugStructure)) {
        BeanCopyManualUtils.copyGnuStructureToProductDetailDTO(productDrugStructure, productDetailDTO);
    }
    BeanCopyManualUtils.copyItemStructureToProductDetailDTO(productUnitStructure, productDetailDTO);

2. 批量操作： list.parallelStream 多線程并發執行
   思路一：一次查批量，思路二：一次查一個，并發執行查

    testList.parallelStream().forEach(element->{
        System.out.println(Thread.currentThread().toString()+element);
    });