lambda根据字段类型分组,根据字段去重

import com.xxl.job.core.biz.model.ReturnT;
import com.xxl.job.core.handler.IJobHandler;
import com.xxl.job.core.handler.annotation.JobHandler;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.TreeSet;
import java.util.stream.Collectors;

/**
 * @author WU SHENG QIANG
 * @Date 2019/10/23 17:15
 * @Description
 */
@JobHandler(value = "CouponExpireJobHandler")
@Component
@Slf4j
public class CouponExpireJobHandler extends IJobHandler {

    @Autowired
    private CouponTvDao couponTvDao;

    @Override
    public ReturnT<String> execute(String s) throws Exception {
        log.info("/CouponExpireJobHandler [定时任务]判断优惠券是否过期,更改状态为已过期 s:{}", s);
        List<CouponGetPo> couponList = couponTvDao.couponExpire();
        if (couponList.size() > 0) {
            //时间类型是为1的根据CouponId去重
            Map<Integer, List<CouponGetPo>> map = couponList.stream().collect(Collectors.groupingBy(CouponGetPo::getTimelimitType));
            List<CouponGetPo> couponExpireList = null == map.get(2) ? new ArrayList<>() : map.get(2);
            List<CouponGetPo> couponTimeList = map.get(1);
            if (null != couponTimeList && couponTimeList.size() > 0) {
                couponExpireList.addAll(couponTimeList.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() ->
                        new TreeSet<>(Comparator.comparing(o -> o.getCouponId()))), ArrayList::new)));
            }
            log.info("/CouponExpireJobHandler 优惠券过期总数量:{},时间范围去重后的数量:{},couponList:{}", couponList.size(), couponExpireList.size(), couponList);
            for (CouponGetPo coupon : couponExpireList) {
                if (1 == coupon.getTimelimitType()) {//时间范围的优惠券,结束时间都是一致的,所以根据优惠券id改变所有优惠券状态为已过期
                    try {
                        couponTvDao.updateCouponStatus(coupon.getCouponId());
                    } catch (Exception e) {
                        log.error("/CouponExpireJobHandler 更新所有过期(时间范围)优惠券状态失败了 CouponId:{} e:{}", coupon.getCouponId(), e.getMessage());
                    }
                } else {
                    coupon.setStatus(0);
                    try {
                        couponTvDao.updateCouponGet(coupon);
                    } catch (Exception e) {
                        log.error("/CouponExpireJobHandler 更新过期的(固定天数)优惠券失败了 领取表Id:{} e:{}", coupon.getId(), e.getMessage());
                    }
                }
            }
        }
        return SUCCESS;
    }
}