de.weltraumschaf.commons.experimental

Class SoftCache<K,V>

java.lang.Object

de.weltraumschaf.commons.experimental.SoftCache<K,V>

Type Parameters:

K - type of cache key

V - type of cached value

public class SoftCache<K,V>
extends Object

A simple in memory cache based on soft reference.

Author:

Sven Strittmatter <weltraumschaf@googlemail.com>

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	SoftCache.Finder<K,V> Implementations of this interface may be used to provide values not in the cache yet.
private static class	SoftCache.NullFinder<K,V> Default implementation which does not find anything.

Field Summary

Fields

Modifier and Type	Field and Description
private Map<K,SoftReference<V>>	data Holds the cached data.
private SoftCache.Finder<K,V>	finder Try to finds values if a key not present yet in cache.

Constructor Summary

Constructors

Constructor and Description
SoftCache()

Method Summary

Modifier and Type	Method and Description
void	add(K key, V value) Add a value to the cache.
void	finder(SoftCache.Finder<K,V> f) Set the finder for this cache.
V	get(K key) Get a value from the cache.
void	remove(K key) Removes value from cache.

Methods inherited from class java.lang.Object

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

Field Detail

data

private final Map<K,SoftReference<V>> data

Holds the cached data.

finder

private SoftCache.Finder<K,V> finder

Try to finds values if a key not present yet in cache.

Constructor Detail

SoftCache

public SoftCache()

Method Detail

get

public V get(K key)

Get a value from the cache.

If key not present yet, then the finder is asked. If no finder set a default finder is used which does not find anything.

Parameters:

key - must not be null

Returns:

may be null

add

public void add(K key,
                V value)

Add a value to the cache.

Parameters:

key - must not be null

value - must not be null

remove

public void remove(K key)

Removes value from cache.

Parameters:

key - must not be null

finder

public void finder(SoftCache.Finder<K,V> f)

Set the finder for this cache.

Parameters:

f - must not be null