|  | @@ -15,10 +15,7 @@ import org.springframework.beans.factory.annotation.Autowired;
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				|  |  |  import org.springframework.beans.factory.annotation.Qualifier;
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				|  |  |  import org.springframework.data.redis.core.RedisTemplate;
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				|  |  |  
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				|  |  | -import java.util.ArrayList;
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				|  |  | -import java.util.LinkedHashMap;
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				|  |  | -import java.util.List;
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				|  |  | -import java.util.Map;
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				|  |  | +import java.util.*;
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				|  |  |  
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				|  |  |  /**
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				|  |  |   * @author dyp
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				|  | @@ -41,7 +38,7 @@ public abstract class AbstractFlowPoolWithLevelRecallStrategy implements RecallS
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				|  |  |          List<Video> results = new ArrayList<>();
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				|  |  |          List<String> data = redisTemplate.opsForSet().randomMembers(flowPoolKey, getSize);
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				|  |  |          if (CollectionUtils.isEmpty(data)) {
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				|  |  | -            return null;
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				|  |  | +            return Collections.emptyList();
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				|  |  |          }
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				|  |  |          Map<Long, String> videoFlowPoolMap = new LinkedHashMap<>();
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				|  |  |          for (String value : data) {
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