Beispiel #1
0
        public Func <Key, ValueTask <T> > CreateIndexMany <Key>(Func <T, IEnumerable <Key> > keySelector)
        {
            keySelector.NotNull(nameof(keySelector));
            var index = new AtomicDictionary <Key, T>();

            _upserters.Add(async transaction =>
            {
                foreach (var key in keySelector(transaction.Item))
                {
                    index[key] = transaction.Item;
                }
            });
            _deleters.Add(async item =>
            {
                foreach (var key in keySelector(item))
                {
                    index.TryRemove(key);
                }
            });
            return(async key =>
            {
                await Initialize();

                return index.TryGetValue(key, out var item) ? item : default;
            });
        }
Beispiel #2
0
        public Func <Key, ValueTask <T> > CreatePrimaryKey <Key>(Expression <Func <T, Key> > keySelectorExpression)
        {
            keySelectorExpression.NotNull(nameof(keySelectorExpression));
            if (!_primaryKeyCreated.TrySet(true))
            {
                throw new Exception("Primary Key already exists");
            }

            var keySelector = keySelectorExpression.Compile();
            var index       = new AtomicDictionary <Key, T>();

            _items = index.Values;
            _upserters.Add(async transaction =>
            {
                var key = keySelector(transaction.Item);
                if (key is null)
                {
                    throw new Exception($"Upsert failed, key is null. Key: {keySelectorExpression.ToString()}, Document: {typeof(T).FullName}");
                }
                if (transaction.Write && _settings.DataDir.IsNotNullOrWhiteSpace())
                {
                    var zipFile = GetFile(key.ToString());
                    var zipPath = zipFile.FullName;
                    using (await _fileLocks.GetOrAdd(zipPath).EnterAsync())
                    {
                        var tempFile = new FileInfo($"{zipPath}.temp");
                        using (var zip = ZipFile.Open(tempFile.FullName, ZipArchiveMode.Update))
                        {
                            var name         = zipFile.Name.SkipLast(zipFile.Extension.Length).AsString();
                            using var stream = zip.CreateEntry(name, CompressionLevel.Optimal).Open();
                            await Jsonizer.SerializeAsync(transaction.Item, stream);
                        }
                        await tempFile.MoveAsync(zipFile);
                    }
                }
                else if (index.ContainsKey(key))
                {
                    throw new Exception($"Duplicate entry found in db.json files. Key: {key}");
                }
                index[key] = transaction.Item;
            });
            _deleters.Add(async item =>
            {
                var key = keySelector(item);
                if (key is null)
                {
                    throw new Exception($"Delete failed, key is null. Key: {keySelectorExpression.ToString()}, Document: {typeof(T).FullName}");
                }
                if (index.TryRemove(key) && _settings.DataDir.IsNotNullOrWhiteSpace())
                {
                    var zip = GetFile(key.ToString());
                    using (await _fileLocks.GetOrAdd(zip.FullName).EnterAsync())
                        await zip.DeleteAsync();
                }
            });
            return(async key =>
            {
                await Initialize();

                return index.TryGetValue(key, out var item) ? item : default;
            });
        }