Package org.apache.camel.component.caffeine.lrucache

Class CaffeineLRUSoftCache<K,V>

java.lang.Object

org.apache.camel.component.caffeine.lrucache.CaffeineLRUCache<K,V>

org.apache.camel.component.caffeine.lrucache.CaffeineLRUSoftCache<K,V>

All Implemented Interfaces:

com.github.benmanes.caffeine.cache.RemovalListener<K,V>, Serializable, Map<K,V>, org.apache.camel.support.LRUCache<K,V>

public class CaffeineLRUSoftCache<K,V>
extends CaffeineLRUCache<K,V>

A cache that uses a near optional LRU Cache using SoftReference.

The Cache is implemented by Caffeine which provides an efficient cache.

This implementation uses SoftReference for stored values in the cache, to support the JVM when it wants to reclaim objects when it's running out of memory. Therefore this implementation does not support all the Map methods.

Only methods below should be used:

• containsKey - To determine if the key is in the cache and refers to a value
• entrySet - To return a set of all the entries (as key/value pairs)
• get - To get a value from the cache
• isEmpty - To determine if the cache contains any values
• keySet - To return a set of the current keys which refers to a value
• put - To add a value to the cache
• putAll - To add values to the cache
• remove - To remove a value from the cache by its key
• size - To get the current size
• values - To return a copy of all the value in a list

The CaffeineLRUCache.containsValue(Object) method should not be used as it's not adjusted to check for the existence of a value without catering for the soft references.

Notice that if the JVM reclaims memory, the content of this cache may be garbage collected without any eviction notifications.

Use LRUCacheFactory to create a new instance (do not use the constructor).

See Also:

LRUCacheFactory, CaffeineLRUCache, CaffeineLRUWeakCache, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Field Summary

Fields inherited from class org.apache.camel.component.caffeine.lrucache.CaffeineLRUCache

evicted, hits, misses

Constructor Summary

Constructors

Constructor	Description
CaffeineLRUSoftCache(int maximumCacheSize)
CaffeineLRUSoftCache(int initialCapacity, int maximumCacheSize)
CaffeineLRUSoftCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction)

Method Summary

Modifier and Type	Method	Description
String	toString()

Methods inherited from class org.apache.camel.component.caffeine.lrucache.CaffeineLRUCache

cleanUp, clear, containsKey, containsValue, entrySet, get, getEvicted, getHits, getMaxCacheSize, getMisses, isEmpty, keySet, onRemoval, put, putAll, remove, resetStatistics, size, values

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

CaffeineLRUSoftCache

public CaffeineLRUSoftCache(int maximumCacheSize)

CaffeineLRUSoftCache

public CaffeineLRUSoftCache(int initialCapacity,
                            int maximumCacheSize)

CaffeineLRUSoftCache

public CaffeineLRUSoftCache(int initialCapacity,
                            int maximumCacheSize,
                            boolean stopOnEviction)

Method Detail

toString

public String toString()

Overrides:

toString in class CaffeineLRUCache<K,V>