Exemplo n.º 1
0
        public async Task Preload(string FilePath)
        {
            await Task.Run(() =>
            {
                try
                {
                    Dictionary <long, NodeBlock> nodeblocks = new Dictionary <long, NodeBlock>();

                    for (int header = 0; header < next.Length; header++)
                    {
                        for (int value = 0; value < next[header].Length; value++)
                        {
                            foreach (INodeBlock inb in next[header][value])
                            {
                                if (inb is NodeBlock nb)
                                {
                                    nodeblocks.Add(nb.Offset, nb);
                                }
                            }
                        }
                    }
                    using (LockedNodeFileStream ns = new LockedNodeFileStream(new FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess)))
                    {
                        using (FileStream fs = new FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))
                        {
                            using (FileStream fsn = new FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))
                            {
                                byte[] offsetBytes = new byte[DiskNode.HEADER_BYTES];

                                fs.Read(offsetBytes, 0, offsetBytes.Length);

                                long JsonOffset = offsetBytes.GetLong(0);
                                long SortOffset = offsetBytes.GetLong(8);

                                fs.Seek(SortOffset, SeekOrigin.Begin);

                                ulong freeMem = SystemInterop.Memory.Status.ullAvailPhys;

                                while (freeMem > this.Settings.MinFreeMemory + this.Settings.RangeFreeMemory)
                                {
                                    for (int i = 0; i < this.Settings.PreloadChunkSize / 2; i++)
                                    {
                                        if (fs.Position >= JsonOffset)
                                        {
                                            return;
                                        }

                                        byte[] thisNodeBytes = new byte[5];

                                        fs.Read(thisNodeBytes, 0, thisNodeBytes.Length);

                                        long offset = thisNodeBytes.GetInt40();

                                        if (!NoCache.Contains(offset))
                                        {
                                            if (!nodeblocks.TryGetValue(offset, out NodeBlock nb))
                                            {
                                                continue;
                                            }

                                            DiskNode dn = new DiskNode(ns, offset);

                                            if (dn.NextOffset != 0)
                                            {
                                                long bLength = dn.NextOffset - dn.Offset;

                                                ByteCache cachedBytes = new ByteCache()
                                                {
                                                    Data = new byte[bLength]
                                                };

                                                fsn.Seek(dn.Offset, SeekOrigin.Begin);

                                                fsn.Read(cachedBytes.Data, 0, (int)bLength);

                                                CachedBytes[nb.Index] = cachedBytes;

                                                freeMem -= (ulong)cachedBytes.Data.Length;
                                            }
                                        }

                                        if (freeMem < this.Settings.MinFreeMemory + this.Settings.RangeFreeMemory)
                                        {
                                            return;
                                        }
                                    }

                                    freeMem = SystemInterop.Memory.Status.ullAvailPhys;
                                }
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    if (Debugger.IsAttached)
                    {
                        Debugger.Break();
                    }
                }
            });
        }
Exemplo n.º 2
0
        public override void Evaluate(Evaluation e, long routeKey, bool MultiThread = true)
        {
            ExecutingEvaluations++;

            try
            {
                if (e is null)
                {
                    throw new ArgumentNullException(nameof(e));
                }

                string FilePath = DiskNode._backingStream.FilePath;

                object streamLock = new object();

                using (FileStream fs = new FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))
                {
                    List <INodeBlock> matchingNodes = new List <INodeBlock>(LastMatchAmount);

                    for (int header = 0; header < next.Length; header++)
                    {
                        int value = e.DataRow[header];

                        if (next[header].Length > value)
                        {
                            matchingNodes.AddRange(next[header][value]);
                        }
                    }

                    LastMatchAmount = Math.Max(LastMatchAmount, matchingNodes.Count);

                    void Evaluate(INodeBlock n)
                    {
                        if (n is DiskNode dn)
                        {
                            dn.Evaluate(e, 0, MultiThread);
                        }
                        else if (n is NodeBlock nb)
                        {
                            long bLength = n.NextOffset - n.Offset;

                            if (!ArrayPool.TryDequeue(out byte[] backingData) || backingData.Length < bLength)
                            {
                                backingData = new byte[bLength];
                            }

                            ByteCache cachedBytes = CachedBytes[nb.Index];

                            if (cachedBytes.Data is null)
                            {
                                cachedBytes = new ByteCache()
                                {
                                    Data = new byte[bLength]
                                };

                                lock (streamLock)
                                {
                                    fs.Seek(n.Offset, SeekOrigin.Begin);

                                    fs.Read(cachedBytes.Data, 0, (int)bLength);
                                }

                                CachedBytes[nb.Index] = cachedBytes;
                            }

                            cachedBytes.SetLast();

                            cachedBytes.Data.CopyTo(backingData, 0);

                            DiskNode nn = new DiskNode(backingData, n.Offset, n.Offset);

                            nn.Evaluate(e, 0, MultiThread);
                        }
                    }

                    if (MultiThread)
                    {
                        Parallel.ForEach(matchingNodes, Evaluate);
                    }
                    else
                    {
                        foreach (INodeBlock nb in matchingNodes)
                        {
                            Evaluate(nb);
                        }
                    }
                }
            }
            finally
            {
                ExecutingEvaluations--;
                FlushMemory();
            }
        }