org.apache.ignite.cache.eviction.lru

Class LruEvictionPolicyFactory<K,V>

java.lang.Object

org.apache.ignite.cache.eviction.AbstractEvictionPolicyFactory<LruEvictionPolicy<K,V>>

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

All Implemented Interfaces:

Serializable, javax.cache.configuration.Factory<LruEvictionPolicy<K,V>>

public class LruEvictionPolicyFactory<K,V>
extends AbstractEvictionPolicyFactory<LruEvictionPolicy<K,V>>

Factory class for LruEvictionPolicy. Creates cache Eviction policy based on Least Recently Used (LRU) algorithm and supports batch eviction.

The eviction starts in the following cases:

• The cache size becomes batchSize elements greater than the maximum size.
• The size of cache entries in bytes becomes greater than the maximum memory size. The size of cache entry calculates as sum of key size and value size.

Note:Batch eviction is enabled only if maximum memory limit isn't set (maxMemSize == 0). batchSize elements will be evicted in this case. The default batchSize value is 1. LruEvictionPolicy 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.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
LruEvictionPolicyFactory()
LruEvictionPolicyFactory(int maxSize)
LruEvictionPolicyFactory(int maxSize, int batchSize, long maxMemSize)

Method Summary

Modifier and Type	Method and Description
LruEvictionPolicy<K,V>	create()

Methods inherited from class org.apache.ignite.cache.eviction.AbstractEvictionPolicyFactory

getBatchSize, getMaxMemorySize, getMaxSize, setBatchSize, setMaxMemorySize, setMaxSize

Methods inherited from class java.lang.Object

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

Constructor Detail

LruEvictionPolicyFactory

public LruEvictionPolicyFactory()

LruEvictionPolicyFactory

public LruEvictionPolicyFactory(int maxSize)

Parameters:

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

LruEvictionPolicyFactory

public LruEvictionPolicyFactory(int maxSize,
                                int batchSize,
                                long maxMemSize)

Parameters:

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

batchSize - Batch size.

maxMemSize - Maximum allowed cache size in bytes.

Method Detail

create

public LruEvictionPolicy<K,V> create()