assertEquals(8, recommendCount.get());
cachingRecommender.recommend("2", 1, null);
assertEquals(9, recommendCount.get());
cachingRecommender.refresh(null);
cachingRecommender.estimatePreference("test1", "1");
assertEquals(10, recommendCount.get());
cachingRecommender.estimatePreference("test1", "2");
assertEquals(11, recommendCount.get());
cachingRecommender.estimatePreference("test1", "2");
assertEquals(11, recommendCount.get());