org.gridgain.grid.cache.eviction.random

Class GridCacheRandomEvictionPolicy<K,V>

java.lang.Object

org.gridgain.grid.cache.eviction.random.GridCacheRandomEvictionPolicy<K,V>

All Implemented Interfaces:

GridCacheEvictionPolicy<K,V>, GridCacheRandomEvictionPolicyMBean

public class GridCacheRandomEvictionPolicy<K,V>
extends Object
implements GridCacheEvictionPolicy<K,V>, GridCacheRandomEvictionPolicyMBean

Cache eviction policy which will select random cache entry for eviction if cache size exceeds the getMaxSize() parameter. This implementation is extremely light weight, lock-free, and does not create any data structures to maintain any order for eviction.

Random eviction will provide the best performance over any key set in which every key has the same probability of being accessed.

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
int	getMaxSize() Gets maximum allowed size of cache before entry will start getting evicted.
void	onEntryAccessed(boolean rmv, GridCacheEntry<K,V> entry) Callback for whenever entry is accessed.
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

GridCacheRandomEvictionPolicy

public GridCacheRandomEvictionPolicy()

Constructs random eviction policy with all defaults.

GridCacheRandomEvictionPolicy

public GridCacheRandomEvictionPolicy(int max)

Constructs random 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 GridCacheRandomEvictionPolicyMBean

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 GridCacheRandomEvictionPolicyMBean

Parameters:

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

onEntryAccessed

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

Callback for whenever entry is accessed.

Specified by:

onEntryAccessed in interface GridCacheEvictionPolicy<K,V>

Parameters:

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

entry - Accessed entry.

toString

public String toString()

Overrides:

toString in class Object