20251209

archive/bbs-go/server/internal/cache/topic_cache.go

@@ -0,0 +1,55 @@
+package cache
+
+import (
+	"bbs-go/internal/models/constants"
+	"errors"
+	"time"
+
+	"github.com/goburrow/cache"
+	"github.com/mlogclub/simple/sqls"
+
+	"bbs-go/internal/models"
+	"bbs-go/internal/repositories"
+)
+
+var (
+	topicRecommendCacheKey = "recommend_topics_cache"
+)
+
+var TopicCache = newTopicCache()
+
+type topicCache struct {
+	recommendCache cache.LoadingCache
+}
+
+func newTopicCache() *topicCache {
+	return &topicCache{
+		recommendCache: cache.NewLoadingCache(
+			func(key cache.Key) (value cache.Value, e error) {
+				value = repositories.TopicRepository.Find(sqls.DB(),
+					sqls.NewCnd().Eq("status", constants.StatusOk).Desc("id").Limit(50))
+				if value == nil {
+					e = errors.New("数据不存在")
+				}
+				return
+			},
+			cache.WithMaximumSize(10),
+			cache.WithRefreshAfterWrite(30*time.Minute),
+		),
+	}
+}
+
+func (c *topicCache) GetRecommendTopics() []models.Topic {
+	val, err := c.recommendCache.Get(topicRecommendCacheKey)
+	if err != nil {
+		return nil
+	}
+	if val != nil {
+		return val.([]models.Topic)
+	}
+	return nil
+}
+
+func (c *topicCache) InvalidateRecommend() {
+	c.recommendCache.Invalidate(topicRecommendCacheKey)
+}