Method readFromFile

test/transaction/wal_test.cpp:97–102

protected:
    void readFromFile(FileInfo& fileInfo, void* buffer, uint64_t numBytes,
        uint64_t position) const override {
        std::unique_lock lck{mtx};
        const auto& file = files.at(fileInfo.path);
        memcpy(buffer, file.data() + position, numBytes);
    }

    int64_t readFile(FileInfo& /*fileInfo*/, void* /*buf*/, size_t /*numBytes*/) const override {
        UNREACHABLE_CODE;