bm_buffermap.h

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/*
 * SwatDB
 *
 * @authors: See Contributors.doc for code contributors
 *
 * Copyright (c) 2020,2025 Swarthmore College Computer Science Department
 * Swarthmore PA, Professors Tia Newhall, Ameet Soni
 */
 
#ifndef _SWATDB_BM_BUFFERMAP_H_
#define  _SWATDB_BM_BUFFERMAP_H_
 
#include <utility>
#include <unordered_map>
 
#include "swatdb_types.h"
 
struct BufHash{
  std::size_t operator()(const PageId& page_id) const{
    return (std::hash<unsigned int>() (page_id.file_id)) ^
        (std::hash<unsigned int>() (page_id.page_num));
  }
};
 
class BufferMap {
 
  public:
 
    BufferMap(){ }
 
    ~BufferMap(){ }
 
    FrameId get(PageId page_id);
 
    bool contains(PageId page_id);
 
    void insert(PageId page_id, FrameId frame_id);
 
    void remove(PageId page_id);
 
  private:
 
    std::unordered_map<PageId,FrameId,BufHash> buf_map;
};
 
#endif