Lucene.Net.Index.TestTransactions.SearcherThread.DoWork C# (CSharp) Method

            public override void DoWork()
            {
                IndexReader r1 = null, r2 = null;
                lock (@lock)
                {
                    try
                    {
                        r1 = DirectoryReader.Open(Dir1);
                        r2 = DirectoryReader.Open(Dir2);
                    }
                    catch (IOException e)
                    {
                        if (!e.Message.Contains("on purpose"))
                        {
                            throw e;
                        }
                        if (r1 != null)
                        {
                            r1.Dispose();
                        }
                        if (r2 != null)
                        {
                            r2.Dispose();
                        }
                        return;
                    }
                }
                if (r1.NumDocs != r2.NumDocs)
                {
                    throw new Exception("doc counts differ: r1=" + r1.NumDocs + " r2=" + r2.NumDocs);
                }
                r1.Dispose();
                r2.Dispose();
            }
        }