RazorDB.KeyValueStore.RemoveFromIndex C# (CSharp) Method

        public void RemoveFromIndex(byte[] key, IDictionary<string, byte[]> indexedValues) {
            foreach (var pair in indexedValues) {
                string IndexName = pair.Key;

                // Construct Index key by concatenating the indexed value and the target key
                byte[] indexValue = pair.Value;
                byte[] indexKey = new byte[key.Length + indexValue.Length];
                indexValue.CopyTo(indexKey, 0);
                key.CopyTo(indexKey, indexValue.Length);

                KeyValueStore indexStore = GetSecondaryIndex(IndexName);
                indexStore.Delete(indexKey);
            }
        }

        public void RemoveUpdatedValuesFromIndex2()
        {
            string path = Path.GetFullPath("TestData\\RemoveUpdatedValuesFromIndex2");
            var timer = new Stopwatch();

            using (var db = new KeyValueStore(path)) {
                db.Truncate();
                int totalSize = 0;
                db.Manifest.Logger = msg => Console.WriteLine(msg);

                var indexed = new SortedDictionary<string, byte[]>();
                int num_items = 1000;
                timer.Start();
                for (int i = 0; i < num_items; i++) {
                    indexed["Mod"] = BitConverter.GetBytes(i % 100);
                    db.Set(BitConverter.GetBytes(i), BitConverter.GetBytes(i), indexed);
                    totalSize += 8 + 4;
                }
                timer.Stop();

                Console.WriteLine("Wrote data (with indexing) at a throughput of {0} MB/s", (double)totalSize / timer.Elapsed.TotalSeconds / (1024.0 * 1024.0));

                timer.Reset();
                timer.Start();
                var ctModZeros = db.Find("Mod", BitConverter.GetBytes((int)0)).Count();
                timer.Stop();
                Assert.AreEqual(10, ctModZeros);
                Console.WriteLine("Scanned index at a throughput of {0} items/s", (double)ctModZeros / timer.Elapsed.TotalSeconds);

            }

            // Open the index directly and see if the data is there
            using (var db = new KeyValueStore(Path.Combine(path, "Mod"))) {
                int num_vals = db.EnumerateFromKey(BitConverter.GetBytes((int)0)).Count(pair => pair.Key.Take(4).All(b => b == 0));

                Assert.AreEqual(10, num_vals);
            }

            // Re-open the main key-value store and update the value at 30
            using (var db = new KeyValueStore(path)) {
                var indexed = new SortedDictionary<string, byte[]>();
                indexed["Mod"] = BitConverter.GetBytes(201 % 100);
                db.Set(BitConverter.GetBytes(200), BitConverter.GetBytes(200), indexed);
                // Clean the data from the index
                db.RemoveFromIndex(BitConverter.GetBytes(200), new Dictionary<string, byte[]> { { "Mod", BitConverter.GetBytes(200 % 100) } });
            }

            // Open the index again directly and confirm that the lookup key is gone now as well
            using (var db = new KeyValueStore(Path.Combine(path, "Mod"))) {
                int num_vals = db.EnumerateFromKey(BitConverter.GetBytes((int)0)).Count(pair => pair.Key.Take(4).All(b => b == 0));

                Assert.AreEqual(9, num_vals);
            }
        }