org.apache.ignite.cache.eviction.lru

Class CacheLruEvictionPolicy<K,V>

java.lang.Object

org.apache.ignite.cache.eviction.lru.CacheLruEvictionPolicy<K,V>

All Implemented Interfaces:

CacheEvictionPolicy<K,V>, CacheLruEvictionPolicyMBean

public class CacheLruEvictionPolicy<K,V>
extends Object
implements CacheEvictionPolicy<K,V>, CacheLruEvictionPolicyMBean

Eviction policy based on Least Recently Used (LRU) algorithm. This implementation is very efficient since it is lock-free and does not create any additional table-like data structures. The LRU ordering information is maintained by attaching ordering metadata to cache entries.

Constructor Summary

Constructors

Constructor and Description
CacheLruEvictionPolicy() Constructs LRU eviction policy with all defaults.
CacheLruEvictionPolicy(int max) Constructs LRU eviction policy with maximum size.

Method Summary

Methods

Modifier and Type	Method and Description
int	getCurrentSize() Gets current queue size.
int	getMaxSize() Gets maximum allowed size of cache before entry will start getting evicted.
void	onEntryAccessed(boolean rmv, EvictableEntry<K,V> entry) Callback for whenever entry is accessed.
Collection<EvictableEntry<K,V>>	queue() Gets read-only view on internal FIFO queue in proper order.
void	setMaxSize(int max) Sets maximum allowed size of cache before entry will start getting evicted.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheLruEvictionPolicy

public CacheLruEvictionPolicy()

Constructs LRU eviction policy with all defaults.

CacheLruEvictionPolicy

public CacheLruEvictionPolicy(int max)

Constructs LRU eviction policy with maximum size.

Parameters:

max - Maximum allowed size of cache before entry will start getting evicted.

Method Detail

getMaxSize

public int getMaxSize()

Gets maximum allowed size of cache before entry will start getting evicted.

Specified by:

getMaxSize in interface CacheLruEvictionPolicyMBean

Returns:

Maximum allowed size of cache before entry will start getting evicted.

setMaxSize

public void setMaxSize(int max)

Sets maximum allowed size of cache before entry will start getting evicted.

Specified by:

setMaxSize in interface CacheLruEvictionPolicyMBean

Parameters:

max - Maximum allowed size of cache before entry will start getting evicted.

getCurrentSize

public int getCurrentSize()

Gets current queue size.

Specified by:

getCurrentSize in interface CacheLruEvictionPolicyMBean

Returns:

Current queue size.

queue

public Collection<EvictableEntry<K,V>> queue()

Gets read-only view on internal FIFO queue in proper order.

Returns:

Read-only view ono internal 'FIFO' queue.

onEntryAccessed

public void onEntryAccessed(boolean rmv,
                   EvictableEntry<K,V> entry)

Callback for whenever entry is accessed.

Specified by:

onEntryAccessed in interface CacheEvictionPolicy<K,V>

Parameters:

rmv - True if entry has been removed, false otherwise.

entry - Accessed entry.

toString

public String toString()

Overrides:

toString in class Object