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

Class ClockPageReplacementPolicy

java.lang.Object

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

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

public class ClockPageReplacementPolicy
extends PageReplacementPolicy

CLOCK page replacement policy implementation.

See Also:

PageReplacementMode.CLOCK

Field Summary

Fields inherited from class org.apache.ignite.internal.processors.cache.persistence.pagemem.PageReplacementPolicy

seg

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ClockPageReplacementPolicy(org.apache.ignite.internal.processors.cache.persistence.pagemem.PageMemoryImpl.Segment seg, long ptr, int pagesCnt)

Method Summary

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

Methods inherited from class org.apache.ignite.internal.processors.cache.persistence.pagemem.PageReplacementPolicy

onMiss

Methods inherited from class java.lang.Object

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

Constructor Detail

ClockPageReplacementPolicy

protected ClockPageReplacementPolicy(org.apache.ignite.internal.processors.cache.persistence.pagemem.PageMemoryImpl.Segment seg,
                                     long ptr,
                                     int pagesCnt)

Parameters:

seg - Page memory segment.

ptr - Pointer to memory region.

pagesCnt - Pages count.

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.

Overrides:

onHit in class PageReplacementPolicy

onRemove

public void onRemove(long relPtr)

Page removed from the page memory.

Overrides:

onRemove in class PageReplacementPolicy

replace

public long replace()
             throws IgniteCheckedException

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

Specified by:

replace in class PageReplacementPolicy

Returns:

Relative pointer to page.

Throws:

IgniteCheckedException