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48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
//
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// Created by YuhangQ on 2021/9/24.
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//
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#ifndef INVODB_PAGE_MANAGER_H
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#define INVODB_PAGE_MANAGER_H
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#include <iostream>
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#include <fstream>
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#include <map>
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#include "storage_page.h"
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#include "json/json.hpp"
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#include "invodb/models/cache.h"
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template<typename T, int T_SIZE>
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class List;
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class PageManager {
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public:
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static PageManager& Instance() {
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static PageManager instance;
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return instance;
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}
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static int loadDatabase(const char *filename);
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StoragePage getPage(const int &index);
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void setPage(const int &index, const StoragePage &page);
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template<typename T>
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static std::shared_ptr<T> getNode(const int &index);
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int allocate();
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void release(const int &index, const bool &next = true);
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int saveJSONToFile(const nlohmann::json& json);
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nlohmann::json readJSONFromFile(const int &index);
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private:
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std::map<int, StoragePage> map;
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std::fstream stream;
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LRUCache<int, std::shared_ptr<StoragePage>> cache;
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// 私有化实现单例
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PageManager():cache(LRUCache<int, std::shared_ptr<StoragePage>>(100000)) {}
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~PageManager() {}
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PageManager(const PageManager&);
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PageManager& operator=(const PageManager&);
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};
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#endif //INVODB_PAGE_MANAGER_H
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