FuzzyCheckpointSet Class Reference

FuzzyCheckpointSet keeps track of dirty pages at the time of a checkpoint. More...

#include <FuzzyCheckpointSet.h>

Inheritance diagram for FuzzyCheckpointSet:


Public Member Functions
	FuzzyCheckpointSet ()
	Constructs a new FuzzyCheckpointSet.
void	clear ()
	Forget all dirty pages.
void	finishCheckpoint ()
	Receives notification that a checkpoint is completing.
void	setDelegatePagePredicate (PagePredicate &pagePredicate)
virtual bool	operator() (CachePage const &page)
	Tests the predicate.
Private Attributes
std::hash_set< BlockId >	oldDirtyPages
	Pages dirty during last checkpoint.
std::vector< BlockId >	newDirtyPages
	Pages dirty during current checkpoint.
PagePredicate *	pDelegatePagePredicate

Detailed Description

FuzzyCheckpointSet keeps track of dirty pages at the time of a checkpoint.

It implements the PagePredicate interface by returning true only for pages which have remained dirty since the last checkpoint.

Definition at line 39 of file FuzzyCheckpointSet.h.

Constructor & Destructor Documentation

FuzzyCheckpointSet::FuzzyCheckpointSet ( ) [explicit]

Constructs a new FuzzyCheckpointSet.

Definition at line 29 of file FuzzyCheckpointSet.cpp.

References pDelegatePagePredicate.

00030 {
00031     pDelegatePagePredicate = NULL;
00032 }

Member Function Documentation

void FuzzyCheckpointSet::clear ( )

Forget all dirty pages.

Definition at line 34 of file FuzzyCheckpointSet.cpp.

References newDirtyPages, oldDirtyPages, and pDelegatePagePredicate.

Referenced by VersionedSegment::delegatedCheckpoint().

00035 {
00036     oldDirtyPages.clear();
00037     newDirtyPages.clear();
00038     pDelegatePagePredicate = NULL;
00039 }

void FuzzyCheckpointSet::finishCheckpoint ( )

Receives notification that a checkpoint is completing.

Definition at line 41 of file FuzzyCheckpointSet.cpp.

References newDirtyPages, oldDirtyPages, and pDelegatePagePredicate.

Referenced by VersionedSegment::delegatedCheckpoint().

00042 {
00043     oldDirtyPages.clear();
00044     oldDirtyPages.insert(
00045         newDirtyPages.begin(),
00046         newDirtyPages.end());
00047     newDirtyPages.clear();
00048     pDelegatePagePredicate = NULL;
00049 }

void FuzzyCheckpointSet::setDelegatePagePredicate ( PagePredicate & pagePredicate )

Definition at line 64 of file FuzzyCheckpointSet.cpp.

References pDelegatePagePredicate.

Referenced by VersionedSegment::delegatedCheckpoint().

00065 {
00066     pDelegatePagePredicate = &pagePredicate;
00067 }

bool FuzzyCheckpointSet::operator() ( CachePage const & page ) [virtual]

Tests the predicate.

Parameters:

page

the page to be considered

Returns:: true iff the page satisfies the predicate

Implements PagePredicate.

Definition at line 51 of file FuzzyCheckpointSet.cpp.

References CachePage::isDirty(), newDirtyPages, oldDirtyPages, and pDelegatePagePredicate.

00052 {
00053     if (!page.isDirty()) {
00054         return false;
00055     }
00056     if (pDelegatePagePredicate && !(*pDelegatePagePredicate)(page)) {
00057         return false;
00058     }
00059     BlockId blockId = page.getBlockId();
00060     newDirtyPages.push_back(blockId);
00061     return (oldDirtyPages.find(blockId) != oldDirtyPages.end());
00062 }