org.apache.ojb.broker.cache
Class ObjectCacheSoftImpl.SoftHashMap

java.lang.Object
  org.apache.ojb.broker.cache.ObjectCacheSoftImpl.SoftHashMap

Enclosing class:

ObjectCacheSoftImpl

public static final class ObjectCacheSoftImpl.SoftHashMap
extends Object

Kind of map using SoftReference to store values

Nested Class Summary

private class

ObjectCacheSoftImpl.SoftHashMap.SoftValue Class derived from SoftReference, used to store the key of the map.

Field Summary

private org.apache.commons.collections.LRUMap	hardCacheMap The FIFO list of hard references, order of last access.
private HashMap	hash The internal HashMap that will hold the SoftReference.
private ReferenceQueue	queue Reference queue for cleared SoftReference objects.

Constructor Summary

ObjectCacheSoftImpl.SoftHashMap(int hardSize)
Construct a new hash map with the specified size

Method Summary

void	clear() Clear the map
Object	get(Object key) Retrieve the value associated to a given key
private void	processQueue() Removes keys and objects that have been garbaged
Object	put(Object key, Object value) Put the key, value pair into the HashMap using a SoftValue object
Object	remove(Object key) Remove the entry for this key

Methods inherited from class java.lang.Object

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

Field Detail

hash

private HashMap hash

The internal HashMap that will hold the SoftReference.

hardCacheMap

private org.apache.commons.collections.LRUMap hardCacheMap

The FIFO list of hard references, order of last access.

queue

private ReferenceQueue queue

Reference queue for cleared SoftReference objects.

Constructor Detail

ObjectCacheSoftImpl.SoftHashMap

public ObjectCacheSoftImpl.SoftHashMap(int hardSize)

Construct a new hash map with the specified size

Parameters:

hardSize - the maximum capacity of this map

Method Detail

put

public Object put(Object key,
                  Object value)

Put the key, value pair into the HashMap using a SoftValue object

Parameters:

key - the key

value - the value

Returns:

the old value

get

public Object get(Object key)

Retrieve the value associated to a given key

Parameters:

key - the key

Returns:

the value associated to this key

remove

public Object remove(Object key)

Remove the entry for this key

Parameters:

key - the key

Returns:

the old value

clear

public void clear()

Clear the map

processQueue

private void processQueue()

Removes keys and objects that have been garbaged