Lucene.Net.Index.TestBinaryDocValuesUpdates.TestDeleteUnusedUpdatesFiles C# (CSharp) Method

        public virtual void TestDeleteUnusedUpdatesFiles()
        {
            Directory dir = NewDirectory();
            IndexWriterConfig conf = NewIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(Random()));
            IndexWriter writer = new IndexWriter(dir, conf);

            Document doc = new Document();
            doc.Add(new StringField("id", "d0", Store.NO));
            doc.Add(new BinaryDocValuesField("f", ToBytes(1L)));
            writer.AddDocument(doc);

            // create first gen of update files
            writer.UpdateBinaryDocValue(new Term("id", "d0"), "f", ToBytes(2L));
            writer.Commit();
            int numFiles = dir.ListAll().Length;

            DirectoryReader r = DirectoryReader.Open(dir);
            BytesRef scratch = new BytesRef();
            Assert.AreEqual(2L, GetValue(((AtomicReader)r.Leaves[0].Reader).GetBinaryDocValues("f"), 0, scratch));
            r.Dispose();

            // create second gen of update files, first gen should be deleted
            writer.UpdateBinaryDocValue(new Term("id", "d0"), "f", ToBytes(5L));
            writer.Commit();
            Assert.AreEqual(numFiles, dir.ListAll().Length);

            r = DirectoryReader.Open(dir);
            Assert.AreEqual(5L, GetValue(((AtomicReader)r.Leaves[0].Reader).GetBinaryDocValues("f"), 0, scratch));
            r.Dispose();

            writer.Dispose();
            dir.Dispose();
        }