public void TestRecommender()
{
AtomicInteger recommendCount = new AtomicInteger();
Recommender mockRecommender = new MockRecommender(recommendCount);
Recommender cachingRecommender = new CachingRecommender(mockRecommender);
cachingRecommender.Recommend("1", 1);
Assert.AreEqual(1, recommendCount.Value);
cachingRecommender.Recommend("2", 1);
Assert.AreEqual(2, recommendCount.Value);
cachingRecommender.Recommend("1", 1);
Assert.AreEqual(2, recommendCount.Value);
cachingRecommender.Recommend("2", 1);
Assert.AreEqual(2, recommendCount.Value);
cachingRecommender.Refresh();
cachingRecommender.Recommend("1", 1);
Assert.AreEqual(3, recommendCount.Value);
cachingRecommender.Recommend("2", 1);
Assert.AreEqual(4, recommendCount.Value);
cachingRecommender.Recommend("3", 1);
Assert.AreEqual(5, recommendCount.Value);
// Results from this recommend() method can't be cached:
Rescorer<Item> rescorer = NullRescorer<Item>.Instance;
cachingRecommender.Refresh();
cachingRecommender.Recommend("1", 1, rescorer);
Assert.AreEqual(6, recommendCount.Value);
cachingRecommender.Recommend("2", 1, rescorer);
Assert.AreEqual(7, recommendCount.Value);
cachingRecommender.Recommend("1", 1, rescorer);
Assert.AreEqual(8, recommendCount.Value);
cachingRecommender.Recommend("2", 1, rescorer);
Assert.AreEqual(9, recommendCount.Value);
cachingRecommender.Refresh();
cachingRecommender.EstimatePreference("test1", "1");
Assert.AreEqual(10, recommendCount.Value);
cachingRecommender.EstimatePreference("test1", "2");
Assert.AreEqual(11, recommendCount.Value);
cachingRecommender.EstimatePreference("test1", "2");
Assert.AreEqual(11, recommendCount.Value);
}
internal MockRecommender(AtomicInteger recommendCount)
{
this.recommendCount = recommendCount;
}