org.symphonyoss.s2.canon.runtime.cache

Class WeakCache<K,V>

java.lang.Object

org.symphonyoss.s2.canon.runtime.cache.WeakCache<K,V>

Direct Known Subclasses:

WeakMonitorCache

public class WeakCache<K,V>
extends Object

Constructor Summary

Constructors

Constructor and Description
WeakCache()
WeakCache(IProducerImpl<V> producer)

Method Summary

Modifier and Type	Method and Description
V	cache(K key, V value, boolean notify) Cache the given object as the current version unless it is in the cache already, in which case return the existing value.
V	fetch(K k)
Collection<V>	getAllCached()
protected void	put(K key, V value, boolean notify)

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakCache

public WeakCache()

WeakCache

public WeakCache(IProducerImpl<V> producer)

Method Detail

fetch

public V fetch(K k)

getAllCached

public Collection<V> getAllCached()

cache

public V cache(K key,
               V value,
               boolean notify)

Cache the given object as the current version unless it is in the cache already, in which case return the existing value. In order to minimize synchronization when we load an object from persistent storage we look in the cache, if it is not there we load it from storage and then call this method. If 2 threads try to load the same object at the same time they will both deserialize the object but one of them gets discarded as after loading both threads call this method.

Parameters:

key - The key.

value - The object.

notify - If true then notify all listeners.

Returns:

The "one true instance" of that object.

put

protected void put(K key,
                   V value,
                   boolean notify)