org.apache.ignite.internal.processors.cache.persistence.pagemem

Class PageReplacementPolicy

java.lang.Object

org.apache.ignite.internal.processors.cache.persistence.pagemem.PageReplacementPolicy

Direct Known Subclasses:

ClockPageReplacementPolicy, RandomLruPageReplacementPolicy, SegmentedLruPageReplacementPolicy

public abstract class PageReplacementPolicy
extends Object

Abstract page replacement policy.

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.ignite.internal.processors.cache.persistence.pagemem.PageMemoryImpl.Segment	seg Page memory segment.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PageReplacementPolicy(org.apache.ignite.internal.processors.cache.persistence.pagemem.PageMemoryImpl.Segment seg)

Method Summary

Modifier and Type	Method and Description
void	onHit(long relPtr) Existing page touched.
void	onMiss(long relPtr) New page added.
void	onRemove(long relPtr) Page removed from the page memory.
abstract long	replace() Finds page to replace.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

seg

protected final org.apache.ignite.internal.processors.cache.persistence.pagemem.PageMemoryImpl.Segment seg

Page memory segment.

Constructor Detail

PageReplacementPolicy

protected PageReplacementPolicy(org.apache.ignite.internal.processors.cache.persistence.pagemem.PageMemoryImpl.Segment seg)

Parameters:

seg - Page memory segment.

Method Detail

onHit

public void onHit(long relPtr)

Existing page touched. Note: This method can be invoked under segment write lock or segment read lock.

onMiss

public void onMiss(long relPtr)

New page added. Note: This method always invoked under segment write lock.

onRemove

public void onRemove(long relPtr)

Page removed from the page memory.

replace

public abstract long replace()
                      throws IgniteCheckedException

Finds page to replace. Note: This method always invoked under segment write lock.

Returns:

Relative pointer to page.

Throws:

IgniteCheckedException