firstSkn支持多个

@@ -115,7 +115,7 @@ public class CommonRecallRequestBuilder {
      */
     private RecallRequest buildNewProductRequest(UserRecallRequest userRecallRequest) {
         int size = recallConfigService.queryStrategyConfigSize(userRecallRequest, StrategyEnum.NEW_PRODUCT, 0);
-        NewProductStrategy strategy = new NewProductStrategy(size);
+        CommonNewProductStrategy strategy = new CommonNewProductStrategy(size);
         return new RecallRequest(userRecallRequest.getParamQueryFilter(), strategy);
     }
 

@@ -27,7 +27,7 @@ public class StrategyHelper {
      * @return
      */
     public static List<StrategyEnum> getIntervalStrategyEnums() {
-        return Arrays.asList(StrategyEnum.REC_SKN, StrategyEnum.RT_YOUTUBE_SKN, StrategyEnum.RT_SIM_SKN, StrategyEnum.DIRECT_TRAIN, StrategyEnum.DIRECT_TRAIN_UFO, StrategyEnum.ADD_FLOW, StrategyEnum.NEW_SHOP, StrategyEnum.NEW_PRODUCT);
+        return Arrays.asList(StrategyEnum.REC_SKN, StrategyEnum.RT_YOUTUBE_SKN, StrategyEnum.RT_SIM_SKN, StrategyEnum.DIRECT_TRAIN, StrategyEnum.ADD_FLOW, StrategyEnum.NEW_SHOP, StrategyEnum.NEW_PRODUCT, StrategyEnum.DIRECT_TRAIN_UFO);
     }
 
     /**

 package com.yoho.search.service.recall.strategy.impls;
 
 import com.alibaba.fastjson.JSON;
+import com.yoho.search.base.utils.SearchCollectionUtils;
 import com.yoho.search.cache.CacheTimeConstants;
 import com.yoho.search.service.recall.helper.ExtendFilterHelper;
 import com.yoho.search.service.recall.helper.SortBuilderHelper;
 import com.yoho.search.service.recall.strategy.IStrategy;
 import com.yoho.search.service.recall.strategy.StrategyEnum;
+import org.apache.commons.collections.CollectionUtils;
 import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.search.sort.SortBuilder;
 
@@ -23,8 +25,8 @@ public class CommonFirstSknStrategy implements IStrategy {
 	private List<String> firstSkns;
 
 	public CommonFirstSknStrategy(int size, List<String> firstSkns) {
-		this.firstSkns = firstSkns;
 		this.size = size > firstSkns.size() ? size : firstSkns.size();
+		this.firstSkns = SearchCollectionUtils.safeSubList(firstSkns,0,size);
 	}
 
 	@Override

+package com.yoho.search.service.recall.strategy.impls;
+
+import com.yoho.search.cache.CacheTimeConstants;
+import com.yoho.search.service.recall.helper.ExtendFilterHelper;
+import com.yoho.search.service.recall.helper.SortBuilderHelper;
+import com.yoho.search.service.recall.strategy.IStrategy;
+import com.yoho.search.service.recall.strategy.StrategyEnum;
+import org.elasticsearch.index.query.QueryBuilder;
+import org.elasticsearch.search.sort.SortBuilder;
+
+public class CommonNewProductStrategy implements IStrategy {
+
+    private int size;
+
+    public CommonNewProductStrategy(int size) {
+        this.size = size;
+    }
+
+    @Override
+    public StrategyEnum strategtEnum() {
+        return StrategyEnum.NEW_PRODUCT;
+    }
+
+    @Override
+    public QueryBuilder extendFilter() {
+        return ExtendFilterHelper.newProductFilter();
+    }
+
+    @Override
+    public SortBuilder<?> sortBuilder() {
+        return SortBuilderHelper.getRandomSort();
+    }
+
+    @Override
+    public int size() {
+        return size;
+    }
+
+    @Override
+    public int cacheTimeInMinute() {
+        return CacheTimeConstants.COMMON_RECALL_STRATEGY_CACHE_TIME;
+    }
+
+    @Override
+    public String strategyCacheKey() {
+        StringBuilder sb = defaultStrategyKey();
+        return sb.toString();
+    }
+
+}