com.caucho.util

Class WeakLruCache<K,V>

java.lang.Object

com.caucho.util.WeakLruCache<K,V>

public class WeakLruCache<K,V>
extends java.lang.Object

Fixed length cache with a LRU replacement policy. If cache items implement CacheListener, they will be informed when they're removed from the cache.

Null keys are not allowed. LruCache is synchronized.

Constructor Summary

Constructors

Constructor and Description
WeakLruCache(int initialCapacity) Create the LRU cache with a specific capacity.

Method Summary

Modifier and Type	Method and Description
void	clear() Clears the cache
V	get(K key) Get an item from the cache and make it most recently used.
java.util.Iterator<K>	keys() Returns the keys stored in the cache
java.util.Iterator<K>	keys(java.util.Iterator<K> oldIter) Returns keys stored in the cache using an old iterator
V	put(K key, V value) Puts a new item in the cache.
V	remove(K key) Removes an item from the cache
boolean	removeTail() Remove the last item in the LRU
int	size() Returns the current number of entries in the cache.
java.util.Iterator<V>	values() Returns the values in the cache
java.util.Iterator<V>	values(java.util.Iterator<V> oldIter)

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakLruCache

public WeakLruCache(int initialCapacity)

Create the LRU cache with a specific capacity.

Parameters:

initialCapacity - minimum capacity of the cache

Method Detail

size

public int size()

Returns the current number of entries in the cache.

clear

public void clear()

Clears the cache

get

public V get(K key)

Get an item from the cache and make it most recently used.

Parameters:

key - key to lookup the item

Returns:

the matching object in the cache

put

public V put(K key,
             V value)

Puts a new item in the cache. If the cache is full, remove the LRU item.

Parameters:

key - key to store data

value - value to be stored

Returns:

old value stored under the key

removeTail

public boolean removeTail()

Remove the last item in the LRU

remove

public V remove(K key)

Removes an item from the cache

Parameters:

key - the key to remove

Returns:

the value removed

keys

public java.util.Iterator<K> keys()

Returns the keys stored in the cache

keys

public java.util.Iterator<K> keys(java.util.Iterator<K> oldIter)

Returns keys stored in the cache using an old iterator

values

public java.util.Iterator<V> values()

Returns the values in the cache

values

public java.util.Iterator<V> values(java.util.Iterator<V> oldIter)