org.apache.dubbo.cache.support.lfu

Class LfuCache

java.lang.Object

org.apache.dubbo.cache.support.lfu.LfuCache

All Implemented Interfaces:

Cache

public class LfuCache
extends Object
implements Cache

This class store the cache value per thread. If a service,method,consumer or provided is configured with key cache with value lfu, dubbo initialize the instance of this class using LfuCacheFactory to store method's returns value to server from store without making method call.

     e.g. 1) <dubbo:service cache="lfu" cache.size="5000" cache.evictionFactor="0.3"/>
          2) <dubbo:consumer cache="lfu" />
 

 LfuCache uses url's cache.size value for its max store size, url's cache.evictionFactor value for its eviction factor,
 default store size value will be 1000, default eviction factor will be 0.3
 

See Also:

Cache, LfuCacheFactory, AbstractCacheFactory, CacheFilter

Constructor Summary

Constructors

Constructor and Description
LfuCache(URL url) Initialize LfuCache, it uses constructor argument cache.size value as its storage max size.

Method Summary

Modifier and Type	Method and Description
Object	get(Object key) API to return stored value using a key against the calling thread specific store.
void	put(Object key, Object value) API to store value against a key in the calling thread scope.

Methods inherited from class java.lang.Object

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

Constructor Detail

LfuCache

public LfuCache(URL url)

Initialize LfuCache, it uses constructor argument cache.size value as its storage max size. If nothing is provided then it will use 1000 as default size value. cache.evictionFactor value as its eviction factor. If nothing is provided then it will use 0.3 as default value.

Parameters:

url - A valid URL instance

Method Detail

put

public void put(Object key,
                Object value)

API to store value against a key in the calling thread scope.

Specified by:

put in interface Cache

Parameters:

key - Unique identifier for the object being store.

value - Value getting store

get

public Object get(Object key)

API to return stored value using a key against the calling thread specific store.

Specified by:

get in interface Cache

Parameters:

key - Unique identifier for cache lookup

Returns:

Return stored object against key