bugFix

long-article-recommend-service/src/main/java/com/tzld/longarticle/recommend/server/service/rank/RankService.java

@@ -59,17 +59,21 @@ public class RankService {
             if (i == 1) {
                 // 播放量排序
                 List<RankItem> data = itemMap.get(contentPools[i]);
-                Collections.sort(data, (o1, o2) -> -Double.compare(
-                        o1.getScore(ViewCountStrategy.class.getSimpleName()),
-                        o2.getScore(ViewCountStrategy.class.getSimpleName())));
-                sortedItems.addAll(data);
+                if (CollectionUtils.isNotEmpty(data)) {
+                    Collections.sort(data, (o1, o2) -> -Double.compare(
+                            o1.getScore(ViewCountStrategy.class.getSimpleName()),
+                            o2.getScore(ViewCountStrategy.class.getSimpleName())));
+                    sortedItems.addAll(data);
+                }
             } else {
                 // 相似排序
                 List<RankItem> data = itemMap.get(contentPools[i]);
-                Collections.sort(data, (o1, o2) -> -Double.compare(
-                        o1.getScore(SimilarityStrategy.class.getSimpleName()),
-                        o2.getScore(SimilarityStrategy.class.getSimpleName())));
-                sortedItems.addAll(data);
+                if (CollectionUtils.isNotEmpty(data)) {
+                    Collections.sort(data, (o1, o2) -> -Double.compare(
+                            o1.getScore(SimilarityStrategy.class.getSimpleName()),
+                            o2.getScore(SimilarityStrategy.class.getSimpleName())));
+                    sortedItems.addAll(data);
+                }
             }
         }
         List<Content> contents = CommonCollectionUtils.toList(sortedItems, RankItem::getContent);