Hash table class to keep track of pages in the buffer pool. More...

Public Member Functions
	BufferHashTable (const int htSize)
	~BufferHashTable ()
void	insert (const File *file, const PageId pageNo, const FrameId frameNo)
void	lookup (const File *file, const PageId pageNo, FrameId &frameNo)
void	remove (const File *file, const PageId pageNo)

Detailed Description

Hash table class to keep track of pages in the buffer pool.

Definition at line 43 of file bufferHashTable.h.

Constructor & Destructor Documentation

wiscdb::BufferHashTable::BufferHashTable ( const int htSize )

Constructor of BufferHashTable class

wiscdb::BufferHashTable::~BufferHashTable ( )

Destructor of BufferHashTable class

void wiscdb::BufferHashTable::insert	(	const File *	file,
		const PageId	pageNo,
		const FrameId	frameNo
	)

Insert entry into hash table. Maps (file, pageNo) to bucket and inserts a HashItem.

Parameters:

file	File object
pageNo	Page number in the file
frameNo	Frame number assigned to that page of the file

Exceptions:

HashAlreadyPresentException if the corresponding file/page already exists in the hash table

void wiscdb::BufferHashTable::lookup	(	const File *	file,
		const PageId	pageNo,
		FrameId &	frameNo
	)

Check if (file, pageNo) is currently in the buffer pool (ie. in the hash table). Returns frame number of location in pool

Parameters:

file	File object
pageNo	Page number in the file
frameNo	Frame number reference containing the result of lookup

Exceptions:

HashNotFoundException if the file/page entry is not found in the hash table

void wiscdb::BufferHashTable::remove	(	const File *	file,
		const PageId	pageNo
	)

Remove (file,pageNo) the buffer pool by deleting the appropriate item from hash table.

Parameters:

file	File object
pageNo	Page number in the file

Exceptions:

HashNotFoundException if the file/page entry is not found in the hash table

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