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fix: 性能优化，首页下拉更新，实测6秒左右，稍慢 #1053

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Tim
2026-01-16 16:45:07 +08:00
parent 09f1435e33
commit ef39b5fedf
7 changed files with 193 additions and 32 deletions
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35
backend/src/main/java/com/openisle/service/CommentService.java
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@@ -21,8 +21,12 @@ import com.openisle.service.NotificationService;
import com.openisle.service.PointService;
import com.openisle.service.SubscriptionService;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import lombok.RequiredArgsConstructor;
@@ -316,6 +320,37 @@ public class CommentService {
return result;
}
public Map<Long, List<User>> getParticipantsForPosts(List<Post> posts, int limit) {
if (posts == null || posts.isEmpty()) {
return Map.of();
}
Map<Long, LinkedHashSet<User>> map = new HashMap<>();
List<Long> postIds = new ArrayList<>(posts.size());
for (Post post : posts) {
postIds.add(post.getId());
LinkedHashSet<User> set = new LinkedHashSet<>();
set.add(post.getAuthor());
map.put(post.getId(), set);
}
for (Object[] row : commentRepository.findDistinctAuthorsByPostIds(postIds)) {
Long postId = (Long) row[0];
User author = (User) row[1];
LinkedHashSet<User> set = map.get(postId);
if (set != null) {
set.add(author);
}
}
Map<Long, List<User>> result = new HashMap<>(map.size());
for (Map.Entry<Long, LinkedHashSet<User>> entry : map.entrySet()) {
List<User> list = new ArrayList<>(entry.getValue());
if (list.size() > limit) {
list = list.subList(0, limit);
}
result.put(entry.getKey(), list);
}
return result;
}
public java.util.List<Comment> getCommentsByIds(java.util.List<Long> ids) {
log.debug("getCommentsByIds called for ids {}", ids);
java.util.List<Comment> comments = commentRepository.findAllById(ids);