PageReplacementPolicy (Ignite 2.17.0)

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 Description

protected org.apache.ignite.internal.processors.cache.persistence.pagemem.PageMemoryImpl.Segment seg
Page memory segment.

Constructor Summary

Constructors
Modifier Constructor Description

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

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	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