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

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

            int docid = 0;
            int numRounds = AtLeast(10);
            for (int rnd = 0; rnd < numRounds; rnd++)
            {
                Document doc = new Document();
                doc.Add(new StringField("key", "doc", Store.NO));
                doc.Add(new BinaryDocValuesField("bdv", ToBytes(-1)));
                int numDocs = AtLeast(30);
                for (int i = 0; i < numDocs; i++)
                {
                    doc.RemoveField("id");
                    doc.Add(new StringField("id", Convert.ToString(docid++), Store.NO));
                    writer.AddDocument(doc);
                }

                long value = rnd + 1;
                writer.UpdateBinaryDocValue(new Term("key", "doc"), "bdv", ToBytes(value));

                if (random.NextDouble() < 0.2) // randomly delete some docs
                {
                    writer.DeleteDocuments(new Term("id", Convert.ToString(random.Next(docid))));
                }

                // randomly commit or reopen-IW (or nothing), before forceMerge
                if (random.NextDouble() < 0.4)
                {
                    writer.Commit();
                }
                else if (random.NextDouble() < 0.1)
                {
                    writer.Dispose();
                    writer = new IndexWriter(dir, (IndexWriterConfig)conf.Clone());
                }

                // add another document with the current value, to be sure forceMerge has
                // something to merge (for instance, it could be that CMS finished merging
                // all segments down to 1 before the delete was applied, so when
                // forceMerge is called, the index will be with one segment and deletes
                // and some MPs might now merge it, thereby invalidating test's
                // assumption that the reader has no deletes).
                doc = new Document();
                doc.Add(new StringField("id", Convert.ToString(docid++), Store.NO));
                doc.Add(new StringField("key", "doc", Store.NO));
                doc.Add(new BinaryDocValuesField("bdv", ToBytes(value)));
                writer.AddDocument(doc);

                writer.ForceMerge(1, true);
                DirectoryReader reader;
                if (random.NextBoolean())
                {
                    writer.Commit();
                    reader = DirectoryReader.Open(dir);
                }
                else
                {
                    reader = DirectoryReader.Open(writer, true);
                }

                Assert.AreEqual(1, reader.Leaves.Count);
                AtomicReader r = (AtomicReader)reader.Leaves[0].Reader;
                Assert.IsNull(r.LiveDocs, "index should have no deletes after forceMerge");
                BinaryDocValues bdv = r.GetBinaryDocValues("bdv");
                Assert.IsNotNull(bdv);
                BytesRef scratch = new BytesRef();
                for (int i = 0; i < r.MaxDoc; i++)
                {
                    Assert.AreEqual(value, GetValue(bdv, i, scratch));
                }
                reader.Dispose();
            }

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