package com.oying.modules.pc.store.service.impl;
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import cn.hutool.core.util.NumberUtil;
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import com.oying.modules.pc.store.domain.Store;
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import com.oying.modules.pc.store.domain.dto.StoreQueryCriteria;
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import com.oying.modules.pc.store.mapper.StoreMapper;
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import com.oying.modules.pc.store.service.StoreQueryService;
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import com.oying.modules.pc.store.service.StoreService;
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import com.oying.utils.PageResult;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.data.redis.core.RedisTemplate;
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import org.springframework.stereotype.Service;
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import java.util.Collections;
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import java.util.List;
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import java.util.Optional;
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import java.util.Set;
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import java.util.concurrent.TimeUnit;
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import java.util.stream.Collectors;
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@Slf4j
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@Service
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@RequiredArgsConstructor
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public class StoreQueryServiceImpl implements StoreQueryService {
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private final RedisTemplate<Object, Object> redisTemplate;
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private final StoreService storeService;
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private final StoreMapper storeMapper;
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@Override
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public PageResult<Store> findPagedStores(StoreQueryCriteria criteria) {
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PageResult<Store> page = new PageResult<>();
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// 1. 检查ZSET是否存在
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String setKey = criteria.buildConditionCacheKey();
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Long total = redisTemplate.opsForZSet().size(setKey);
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if (total == null || total == 0) {
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// 初始化缓存
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List<Long> ids = storeMapper.queryStoreIds(criteria);
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for (Long id : ids) {
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redisTemplate.opsForZSet().add(setKey, 1, id);
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}
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// 设置缓存过期时间
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redisTemplate.expire(setKey, 30, TimeUnit.MINUTES);
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total = (long) ids.size();
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}
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// 2. 从ZSET获取分页ID
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Long offset = NumberUtil.mul(criteria.getPage(), criteria.getSize()).longValue();
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long end = NumberUtil.add(offset, criteria.getSize()).longValue();
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Set<Long> storeIds = Optional.ofNullable(redisTemplate.opsForZSet()
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.range(setKey, offset, end - 1)).orElse(Collections.emptySet())
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.stream().map(i-> (Long) i).collect(Collectors.toSet());
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// 3. 获取详情数据
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List<Store> stores = storeService.listByIds(storeIds);
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page.setContent(stores);
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page.setTotalElements(total);
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return page;
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}
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}
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