e1e30998ba
## Changes * Improves type hashing by introducing xxHash3 (64bit) * Removes individual `tdb` files in favor of a single `SerializedTypes.db` file. This file is only used to identify a type that is being deserialized, which doesn't exist. * Adds duplicate type alias detection * Adds `AssemblyHandler.FindTypeByHash` View changed files whitespaces: https://github.com/modernuo/ModernUO/pull/1172/files?diff=split&w=1 ## SerializedTypes.db The serialized types file is used to get back the original name of a type in case it no longer exists in code. This can easily be necessary if a class is renamed in code and no `TypeAlias` is provided. ### Format byte[4] - version byte[4] - count --array-- byte[8] - xxHash byte[1] - flag, 0 - null, 1 - not null byte[n] - Full class name in UTF8 ### Example <img width="472" alt="SerializedTypes_Example" src="https://user-images.githubusercontent.com/3953314/195255429-31d24293-6bd1-419e-811b-07874dd0f78d.png"> ## Benchmarks Serialized 500 Type fields. The 8192bytes comes from the _ConcurrentQueue_ that would later be used for SerializedTypes. Note that the queue is never cleared, so it's size grew considerably. ```cs | Method | Mean | Error | StdDev | Allocated | |--------------------- |---------:|---------:|---------:|----------:| | BenchmarkXXHash | 18.44 us | 0.278 us | 0.260 us | 8192 B | | BenchmarkTypeStrings | 25.09 us | 0.292 us | 0.259 us | - | ``` TODO: * Add support in the Serialization Generator for `ReadType()` and `Write(Type)` * Remove `SetTypeRef` from Serialization Generator
54 lines
2.2 KiB
C#
54 lines
2.2 KiB
C#
/*************************************************************************
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* ModernUO *
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* Copyright 2019-2022 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: GenericPersistence.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.IO;
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namespace Server;
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public static class GenericPersistence
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{
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public static void Register(
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string name,
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Action<IGenericWriter> serializer,
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Action<IGenericReader> deserializer,
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int priority = Persistence.DefaultPriority
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)
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{
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BufferWriter saveBuffer = null;
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void Serialize()
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{
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saveBuffer ??= new BufferWriter(true, World.SerializedTypes);
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saveBuffer.Seek(0, SeekOrigin.Begin);
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serializer(saveBuffer);
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}
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void WriteSnapshot(string savePath)
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{
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string binPath = Path.Combine(savePath, name, $"{name}.bin");
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var buffer = saveBuffer!.Buffer.AsSpan(0, (int)saveBuffer.Position);
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AdhocPersistence.WriteSnapshot(new FileInfo(binPath), buffer);
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}
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void Deserialize(string savePath, Dictionary<ulong, string> typesDb) =>
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AdhocPersistence.Deserialize(Path.Combine(savePath, name, $"{name}.bin"), deserializer);
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Persistence.Register(name, Serialize, WriteSnapshot, Deserialize, priority);
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}
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}
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