Пример #1
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        /// <summary>
        /// Read bytes from stream into buffer slice
        /// </summary>
        private void ReadStream(Stream stream, long position, BufferSlice buffer)
        {
            // can't test "Length" from out-to-date stream
            // ENSURE(stream.Length <= position - PAGE_SIZE, "can't be read from beyond file length");

            stream.Position = position;

            stream.Read(buffer.Array, buffer.Offset, buffer.Count);
        }
Пример #2
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        public EnginePragmas(BufferSlice buffer, HeaderPage headerPage)
            : this(headerPage)
        {
            foreach (var pragma in _pragmas.Values)
            {
                pragma.Read(buffer);
            }

            _isDirty = false;
        }
Пример #3
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        private async Task InitializeAsync()
        {
            var read = await _source.MoveNextAsync();

            if (!read)
            {
                _isEOF = true;
            }
            _current = _source.Current;
        }
Пример #4
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        /// <summary>
        /// Write buffer container data into disk
        /// </summary>
        public void Write(long position, BufferSlice buffer)
        {
            var writer = _pool.Value.Writer;

            // there is only a single writer instance, must be lock to ensure only 1 single thread are writing
            lock (writer)
            {
                writer.Position = position;
                writer.Write(buffer.Array, buffer.Offset, _containerSize);
            }
        }
Пример #5
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        /// <summary>
        /// Initialize reader based on Stream (if data was persisted in disk) or Buffer (if all data fit in only 1 container)
        /// </summary>
        public void InitializeReader(Stream stream, BufferSlice buffer, bool utcDate)
        {
            if (stream != null)
            {
                _reader = new BufferReader(this.GetSourceFromStream(stream), utcDate);
            }
            else
            {
                _reader = new BufferReader(buffer, utcDate);
            }

            this.MoveNext();
        }
Пример #6
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        public SortService(SortDisk disk, int order, EnginePragmas pragmas)
        {
            _disk          = disk;
            _order         = order;
            _pragmas       = pragmas;
            _containerSize = disk.ContainerSize;

            _reader = new Lazy <Stream>(() => _disk.GetReader());

            var bytes = BufferPool.Rent(disk.ContainerSize);

            _buffer = new BufferSlice(bytes, 0, _containerSize);
        }
Пример #7
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        /// <summary>
        /// Create a fake index node used only in Virtual Index runner
        /// </summary>
        public IndexNode(BsonDocument doc)
        {
            _page = null;
            _segment = new BufferSlice(new byte[0], 0, 0);

            this.Slot = 0;
            this.Position = new PageAddress(0, 0);
            this.Level = 0;
            this.DataBlock = PageAddress.Empty;

            // index node key IS document
            this.Key = doc;
        }
Пример #8
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        public void UpdateBuffer(BufferSlice buffer)
        {
            if (_isDirty == false)
            {
                return;
            }

            foreach (var pragma in _pragmas)
            {
                pragma.Value.Write(buffer);
            }

            _isDirty = false;
        }
Пример #9
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        /// <summary>
        /// Read new DataBlock from filled page segment
        /// </summary>
        public DataBlock(DataPage page, byte index, BufferSlice segment)
        {
            _page    = page;
            _segment = segment;

            this.Position = new PageAddress(page.PageID, index);

            // byte 00: Extend
            this.Extend = segment.ReadBool(P_EXTEND);

            // byte 01-05: NextBlock (PageID, Index)
            this.NextBlock = segment.ReadPageAddress(P_NEXT_BLOCK);

            // byte 06-EOL: Buffer
            this.Buffer = segment.Slice(P_BUFFER, segment.Count - P_BUFFER);
        }
Пример #10
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        /// <summary>
        /// Get 8k buffer slices inside file container
        /// </summary>
        private IEnumerable <BufferSlice> GetSourceFromStream(Stream stream)
        {
            var bytes  = BufferPool.Rent(PAGE_SIZE);
            var buffer = new BufferSlice(bytes, 0, PAGE_SIZE);

            while (_readPosition < _size)
            {
                stream.Position = this.Position + _readPosition;

                stream.Read(bytes, 0, PAGE_SIZE);

                _readPosition += PAGE_SIZE;

                yield return(buffer);
            }

            BufferPool.Return(bytes);
        }
Пример #11
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        /// <summary>
        /// Create new DataBlock and fill into buffer
        /// </summary>
        public DataBlock(DataPage page, byte index, BufferSlice segment, bool extend, PageAddress nextBlock)
        {
            _page    = page;
            _segment = segment;

            this.Position = new PageAddress(page.PageID, index);

            this.NextBlock = nextBlock;
            this.Extend    = extend;

            // byte 00: Data Index
            segment.Write(extend, P_EXTEND);

            // byte 01-05 (can be updated in "UpdateNextBlock")
            segment.Write(nextBlock, P_NEXT_BLOCK);

            // byte 06-EOL: Buffer
            this.Buffer = segment.Slice(P_BUFFER, segment.Count - P_BUFFER);

            page.IsDirty = true;
        }
Пример #12
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        /// <summary>
        /// Read index node from page segment (lazy-load)
        /// </summary>
        public IndexNode(IndexPage page, byte index, BufferSlice segment)
        {
            _page    = page;
            _segment = segment;

            this.Position  = new PageAddress(page.PageID, index);
            this.Slot      = segment.ReadByte(P_SLOT);
            this.Level     = segment.ReadByte(P_LEVEL);
            this.DataBlock = segment.ReadPageAddress(P_DATA_BLOCK);
            this.NextNode  = segment.ReadPageAddress(P_NEXT_NODE);

            this.Next = new PageAddress[this.Level];
            this.Prev = new PageAddress[this.Level];

            for (var i = 0; i < this.Level; i++)
            {
                this.Prev[i] = segment.ReadPageAddress(P_PREV_NEXT + (i * PageAddress.SIZE * 2));
                this.Next[i] = segment.ReadPageAddress(P_PREV_NEXT + (i * PageAddress.SIZE * 2) + PageAddress.SIZE);
            }

            this.Key = segment.ReadIndexKey(P_KEY);
        }
Пример #13
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        public BufferWriter(BufferSlice buffer)
        {
            _source = null;

            _current = buffer;
        }
Пример #14
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        public void Insert(IEnumerable <KeyValuePair <BsonValue, PageAddress> > items, int order, BufferSlice buffer)
        {
            var query = order == Query.Ascending ?
                        items.OrderBy(x => x.Key, _collation) : items.OrderByDescending(x => x.Key, _collation);

            var offset = 0;

            foreach (var item in query)
            {
                buffer.WriteIndexKey(item.Key, offset);

                var keyLength = IndexNode.GetKeyLength(item.Key, false);

                if (keyLength > MAX_INDEX_KEY_LENGTH)
                {
                    throw LiteException.InvalidIndexKey($"Sort key must be less than {MAX_INDEX_KEY_LENGTH} bytes.");
                }

                offset += keyLength;

                buffer.Write(item.Value, offset);

                offset += PageAddress.SIZE;

                _remaining++;
            }

            _count = _remaining;
        }
Пример #15
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        public void Insert(IEnumerable <KeyValuePair <BsonValue, PageAddress> > items, int order, BufferSlice buffer)
        {
            var query = order == Query.Ascending ?
                        items.OrderBy(x => x.Key) : items.OrderByDescending(x => x.Key);

            var offset = 0;

            foreach (var item in query)
            {
                buffer.WriteIndexKey(item.Key, offset);

                offset += GetKeyLength(item.Key);

                buffer.Write(item.Value, offset);

                offset += PageAddress.SIZE;

                _remaining++;
            }

            _count = _remaining;
        }