4jcraft/Minecraft.World/Level/Storage/RegionFileCache.h

#pragma once
#include "RegionFile.h"
#include "../../Util/Reference.h"
#include "../../IO/Files/File.h"

class RegionFileCache {
    friend class ConsoleSaveFileOriginal;

private:
    static const int MAX_CACHE_SIZE = 256;

    std::unordered_map<File, RegionFile*, FileKeyHash, FileKeyEq> cache;

    static RegionFileCache s_defaultCache;

public:
    // Made public and non-static so we can have a cache for input and output
    // files
    RegionFileCache() {}

    RegionFile* _getRegionFile(ConsoleSaveFile* saveFile,
                               const std::wstring& prefix, int chunkX,
                               int chunkZ);  // 4J - TODO was synchronized
    void _clear();                           // 4J - TODO was synchronized
    int _getSizeDelta(ConsoleSaveFile* saveFile, const std::wstring& prefix,
                      int chunkX, int chunkZ);
    DataInputStream* _getChunkDataInputStream(ConsoleSaveFile* saveFile,
                                              const std::wstring& prefix,
                                              int chunkX, int chunkZ);
    DataOutputStream* _getChunkDataOutputStream(ConsoleSaveFile* saveFile,
                                                const std::wstring& prefix,
                                                int chunkX, int chunkZ);

    // Keep static version for general game usage
    static RegionFile* getRegionFile(ConsoleSaveFile* saveFile,
                                     const std::wstring& prefix, int chunkX,
                                     int chunkZ) {
        return s_defaultCache._getRegionFile(saveFile, prefix, chunkX, chunkZ);
    }
    static void clear() { s_defaultCache._clear(); }
    static int getSizeDelta(ConsoleSaveFile* saveFile,
                            const std::wstring& prefix, int chunkX,
                            int chunkZ) {
        return s_defaultCache._getSizeDelta(saveFile, prefix, chunkX, chunkZ);
    }
    static DataInputStream* getChunkDataInputStream(ConsoleSaveFile* saveFile,
                                                    const std::wstring& prefix,
                                                    int chunkX, int chunkZ) {
        return s_defaultCache._getChunkDataInputStream(saveFile, prefix, chunkX,
                                                       chunkZ);
    }
    static DataOutputStream* getChunkDataOutputStream(
        ConsoleSaveFile* saveFile, const std::wstring& prefix, int chunkX,
        int chunkZ) {
        return s_defaultCache._getChunkDataOutputStream(saveFile, prefix,
                                                        chunkX, chunkZ);
    }

private:
    bool useSplitSaves(ESavePlatform platform);
};