Frame Class Reference

#include <bm_frame.h>

Collaboration diagram for Frame:

Public Member Functions
	Frame ()
	Constructor. Calls resetFrame to reset the Frame.
	~Frame ()
	Destructor.
void	resetFrame ()
	Resets the metadata of the Frame.
void	loadFrame (PageId page_id)
	Updates the Frame data according to the loaded Page.

Private Attributes
PageId	page_id
int	pin_count
bool	valid
bool	dirty
std::mutex	frame_mtx

Friends
class	BufferManager
class	ReplacementPolicy
class	Clock
class	Random
class	LRU
class	MRU
class	ClockRandom

Detailed Description

Frame Class which holds metadata about corresponding Page in the buffer pool.

Member Function Documentation

loadFrame()

void Frame::loadFrame

(

PageId

page_id

)

Updates the Frame data according to the loaded Page.

Precondition

None.

Postcondition

Frame data is updated. pin_count is set to 1, page_id is set to page_id parameter, and valid is set to true.

Parameters

page_id

PageId of the Page that is loaded to the Frame

resetFrame()

void Frame::resetFrame

(

)

Resets the metadata of the Frame.

Precondition

None.

Postcondition

page_id is set to INVALID_PAGE_ID. pin_count is set to 0. valid, dirty, and ref_bit are all set to false.

Friends And Related Symbol Documentation

BufferManager

friend class BufferManager

friend

BufferManager and Policies have access to private data members of each Frame. They need direct access to Frame data fields to support synchronizing access to frames by some higher-level operations (getters/setters alone won't do it)

Member Data Documentation

dirty

bool Frame::dirty

private

true if the Frame is dirty. Else false.

frame_mtx

std::mutex Frame::frame_mtx

private

std::mutex for synchronized access to the Page.

page_id

PageId Frame::page_id

private

PageId of the Page in the Frame. Recall PageId is made up of {FileId, PageNum}.

pin_count

int Frame::pin_count

private

The number of pins on the Page.

valid

bool Frame::valid

private

true if the Frame data is valid. Else false.

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The documentation for this class was generated from the following file:

• bm_frame.h