Lucene.Net.Index.IndexWriter.Rollback C# (CSharp) Method

		public virtual void  Rollback()
		{
			EnsureOpen();
			
			// Ensure that only one thread actually gets to do the closing:
			if (ShouldClose())
				RollbackInternal();
		}
		

        public void TestRollbackIntegrityWithBufferFlush()
        {
            Directory dir = new MockRAMDirectory();
            IndexWriter w = new IndexWriter(dir, new WhitespaceAnalyzer(), IndexWriter.MaxFieldLength.UNLIMITED);
            for (int i = 0; i < 5; i++)
            {
                Document doc = new Document();
                doc.Add(new Field("pk", i.ToString(), Field.Store.YES, Field.Index.ANALYZED_NO_NORMS));
                w.AddDocument(doc);
            }
            w.Close();

            // If buffer size is small enough to cause a flush, errors ensue...
            w = new IndexWriter(dir, new WhitespaceAnalyzer(), IndexWriter.MaxFieldLength.UNLIMITED);
            w.SetMaxBufferedDocs(2);

            Term pkTerm = new Term("pk", "");
            for (int i = 0; i < 3; i++)
            {
                Document doc = new Document();
                String value = i.ToString();
                doc.Add(new Field("pk", value, Field.Store.YES, Field.Index.ANALYZED_NO_NORMS));
                doc.Add(new Field("text", "foo", Field.Store.YES, Field.Index.ANALYZED_NO_NORMS));
                w.UpdateDocument(pkTerm.CreateTerm(value), doc);
            }
            w.Rollback();

            IndexReader r = IndexReader.Open(dir, true);
            Assert.AreEqual(5, r.NumDocs(), "index should contain same number of docs post rollback");
            r.Close();
            dir.Close();
        }