buffer.cpp

#include <memory>
#include <iostream>
#include "buffer.h"
#include "exceptions/buffer_exceeded_exception.h"
#include "exceptions/page_not_pinned_exception.h"
#include "exceptions/page_pinned_exception.h"
#include "exceptions/bad_buffer_exception.h"
#include "exceptions/hash_not_found_exception.h"

namespace wiscdb { 
// Frame class implementation

void Frame::Frame(){
  reset();
}

void Frame::reset(){
  //TODO: reset all member variables
}

void Frame::load(File* filePtr, PageId pageNum){
  //TODO: set all member variables for a newly loaded page
}

void Frame::print(){
  if(file){
    std::cout << "file:" << file->filename() << " ";
    std::cout << "pageNo:" << pageNo << " ";
  }
  else
    std::cout << "file:NULL ";

  std::cout << "valid:" << valid << " ";
  std::cout << "pinCnt:" << pinCnt << " ";
  std::cout << "dirty:" << dirty << " ";
  std::cout << "refbit:" << refbit << "\n";
}

//----------------------------------------
// class BufferManager
//----------------------------------------

BufferManager::BufferManager(std::uint32_t bufs) : numBufs(bufs) {
  frameTable = new Frame[bufs];

  for (FrameId i = 0; i < bufs; i++) 
  {
    frameTable[i].frameNo = i;
    frameTable[i].valid = false;
  }

  bufPool = new Page[bufs];

  int htsize = ((((int) (bufs * 1.2))*2)/2)+1;
  hashTable = new BufferHashTable (htsize);  // allocate the buffer hash table

  clockHand = bufs - 1;
}


BufferManager::~BufferManager() {
}

void BufferManager::allocateFrame(FrameId & frame) {
}

  
void BufferManager::readPage(File* file, const PageId pageNo, Page*& page){
}


void BufferManager::unPinPage(File* file, const PageId pageNo, const bool dirty){
}

void BufferManager::flushFile(const File* file) {
}

void BufferManager::disposePage(File* file, const PageId pageNo) {
}


void BufferManager::allocatePage(File* file, PageId &pageNo, Page*& page) {
}

void BufferManager::printSelf() 
{
  Frame* tmpFrame;
  int validFrames = 0;
  
  for (std::uint32_t i = 0; i < numBufs; i++)
  {
    tmpFrame = &(frameTable[i]);
    std::cout << "FrameNo:" << i << " ";
    tmpFrame->print();

    if (tmpFrame->valid == true)
      validFrames++;
  }

  std::cout << "Total Number of Valid Frames:" << validFrames << "\n";
}

void BufferManager::advanceClock(){
}

}