java linq多字段排序时间比较

kenick2023-08-07 12:27

java 复制代码

    public static void main(String[] args) {
        //100万条数据
        List<CrmInvestSaleUserCount> waitAssignUserList = new ArrayList<>();
        for (int i = 0; i < 1000000; i++) {
            waitAssignUserList.add(new CrmInvestSaleUserCount().setSales_username("test" + i).setCount(
                            BigDecimal.valueOf(RandomUtils.nextDouble(0.00, 9.99)))
                    .setWeight(BigDecimal.valueOf(RandomUtils.nextInt(1, 50))));
        }

        //第一种方式 count升序/weight降序
        long startTime = System.currentTimeMillis();
        CrmInvestSaleUserCount saleUserCount = Linq.of(waitAssignUserList).orderBy(CrmInvestSaleUserCount::getCount)
                .thenByDescending(CrmInvestSaleUserCount::getWeight).first();
        log.debug("min1:{},花费时间:{}", saleUserCount, System.currentTimeMillis() - startTime);

        //第二种方式 先按count分组,取最小组,再在最小组中取weight最大的
        startTime = System.currentTimeMillis();
        CrmInvestSaleUserCount crmInvestSaleUserCount = Linq.of(waitAssignUserList)
                .groupBy(CrmInvestSaleUserCount::getCount).minBy(IGrouping::getKey)
                .maxBy(CrmInvestSaleUserCount::getWeight);
        log.debug("min2:{},花费时间:{}", crmInvestSaleUserCount, System.currentTimeMillis() - startTime);
    }

使用的基础类

java 复制代码

public class CrmInvestSaleUserCount {

    @Schema(description = "招商人员手机号")
    private String sales_username;

    @Schema(description = "招商人员显示名称")
    private String sales_display_name;

    @Schema(description = "招商人员已分配数量")
    private BigDecimal count;

    @Schema(description = "招商人员权重")
    private BigDecimal weight;
}