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

Interface PageEvictionTracker

All Superinterfaces:

LifecycleAware

All Known Implementing Classes:

FairFifoPageEvictionTracker, NoOpPageEvictionTracker, PageAbstractEvictionTracker, Random2LruPageEvictionTracker, RandomLruPageEvictionTracker

public interface PageEvictionTracker
extends LifecycleAware

Entry point for per-page eviction. Accepts information about touching data pages, capable of evicting "the least needed" page (according to implemented eviction algorithm).

Method Summary

Modifier and Type	Method and Description
void	evictDataPage() Evicts one data page.
boolean	evictionRequired() Check if page eviction is required according to the configured policy.
void	forgetPage(long pageId) Call this method when last entry is removed from data page.
void	touchPage(long pageId) Call this method when data page is accessed.

Methods inherited from interface org.apache.ignite.lifecycle.LifecycleAware

start, stop

Method Detail

touchPage

void touchPage(long pageId)
        throws IgniteCheckedException

Call this method when data page is accessed.

Parameters:

pageId - Page id.

Throws:

IgniteCheckedException - In case of page memory error.

evictionRequired

boolean evictionRequired()

Check if page eviction is required according to the configured policy.

Returns:

True if eviction required.

evictDataPage

void evictDataPage()
            throws IgniteCheckedException

Evicts one data page. In most cases, all entries will be removed from the page. Method guarantees removing at least one entry from "evicted" data page. Removing all entries may be not possible, as some of them can be used by active transactions.

Throws:

IgniteCheckedException - In case of page memory error.

forgetPage

void forgetPage(long pageId)
         throws IgniteCheckedException

Call this method when last entry is removed from data page.

Parameters:

pageId - Page id.

Throws:

IgniteCheckedException - In case of page memory error.