Lucene.Net.Index.DocumentsWriterDeleteQueue.NewSlice C# (CSharp) Method

        public DeleteSlice NewSlice()
        {
            return new DeleteSlice(Tail);
        }

        public virtual void TestUpdateDelteSlices()
        {
            DocumentsWriterDeleteQueue queue = new DocumentsWriterDeleteQueue();
            int size = 200 + Random.Next(500) * RANDOM_MULTIPLIER;

            int?[] ids = new int?[size];
            for (int i = 0; i < ids.Length; i++)
            {
                ids[i] = Random.Next();
            }
            DeleteSlice     slice1       = queue.NewSlice();
            DeleteSlice     slice2       = queue.NewSlice();
            BufferedUpdates bd1          = new BufferedUpdates();
            BufferedUpdates bd2          = new BufferedUpdates();
            int             last1        = 0;
            int             last2        = 0;
            ISet <Term>     uniqueValues = new JCG.HashSet <Term>();

            for (int j = 0; j < ids.Length; j++)
            {
                int?i = ids[j];
                // create an array here since we compare identity below against tailItem
                Term[] term = new Term[] { new Term("id", i.ToString()) };
                uniqueValues.Add(term[0]);
                queue.AddDelete(term);
                if (Random.Next(20) == 0 || j == ids.Length - 1)
                {
                    queue.UpdateSlice(slice1);
                    Assert.IsTrue(slice1.IsTailItem(term));
                    slice1.Apply(bd1, j);
                    AssertAllBetween(last1, j, bd1, ids);
                    last1 = j + 1;
                }
                if (Random.Next(10) == 5 || j == ids.Length - 1)
                {
                    queue.UpdateSlice(slice2);
                    Assert.IsTrue(slice2.IsTailItem(term));
                    slice2.Apply(bd2, j);
                    AssertAllBetween(last2, j, bd2, ids);
                    last2 = j + 1;
                }
                Assert.AreEqual(j + 1, queue.NumGlobalTermDeletes);
            }
            assertEquals(uniqueValues, new JCG.HashSet <Term>(bd1.terms.Keys));
            assertEquals(uniqueValues, new JCG.HashSet <Term>(bd2.terms.Keys));
            var frozenSet = new JCG.HashSet <Term>();

            foreach (Term t in queue.FreezeGlobalBuffer(null).GetTermsEnumerable())
            {
                BytesRef bytesRef = new BytesRef();
                bytesRef.CopyBytes(t.Bytes);
                frozenSet.Add(new Term(t.Field, bytesRef));
            }
            assertEquals(uniqueValues, frozenSet);
            Assert.AreEqual(0, queue.NumGlobalTermDeletes, "num deletes must be 0 after freeze");
        }