org.jboss.util
Class LRUCachePolicy.LRUList

java.lang.Object
  |
  +--org.jboss.util.LRUCachePolicy.LRUList

Direct Known Subclasses:

LRUEnterpriseContextCachePolicy.ContextLRUList

Enclosing class:

LRUCachePolicy

public class LRUCachePolicy.LRUList

extends java.lang.Object

Double queued list used to store cache entries.

Field Summary

int	m_cacheMiss The cache misses happened
int	m_capacity The current capacity of the cache list
int	m_count The number of cached objects
LRUCachePolicy.LRUCacheEntry	m_head The head of the double linked list
int	m_maxCapacity The maximum capacity of the cache list
int	m_minCapacity The minimum capacity of the cache list
LRUCachePolicy.LRUCacheEntry	m_tail The tail of the double linked list

Constructor Summary

protected

LRUCachePolicy.LRUList() Creates a new double queued list.

Method Summary

protected void	capacityChanged(int oldCapacity) Callback that signals that the capacity of the cache is changed.
protected void	demote() Demotes from the cache the least used entry.
protected void	entryAdded(LRUCachePolicy.LRUCacheEntry entry) Callback that signals that the given entry has been added to the cache.
protected void	entryRemoved(LRUCachePolicy.LRUCacheEntry entry) Callback that signals that the given entry has been removed from the cache.
protected void	promote(LRUCachePolicy.LRUCacheEntry entry) Promotes the cache entry entry to the last used position of the list.
protected void	remove(LRUCachePolicy.LRUCacheEntry entry) Removes from the cache list the specified entry.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

m_maxCapacity

public int m_maxCapacity

The maximum capacity of the cache list

m_minCapacity

public int m_minCapacity

The minimum capacity of the cache list

m_capacity

public int m_capacity

The current capacity of the cache list

m_count

public int m_count

The number of cached objects

m_head

public LRUCachePolicy.LRUCacheEntry m_head

The head of the double linked list

m_tail

public LRUCachePolicy.LRUCacheEntry m_tail

The tail of the double linked list

m_cacheMiss

public int m_cacheMiss

The cache misses happened

Constructor Detail

LRUCachePolicy.LRUList

protected LRUCachePolicy.LRUList()

Creates a new double queued list.

Method Detail

promote

protected void promote(LRUCachePolicy.LRUCacheEntry entry)

Promotes the cache entry entry to the last used position of the list.
If the object is already there, does nothing.

Parameters:

entry - the object to be promoted, cannot be null

Throws:

java.lang.IllegalStateException - if this method is called with a full cache

See Also:

demote()

demote

protected void demote()

Demotes from the cache the least used entry.
If the cache is not full, does nothing.

See Also:

promote(org.jboss.util.LRUCachePolicy.LRUCacheEntry)

remove

protected void remove(LRUCachePolicy.LRUCacheEntry entry)

Removes from the cache list the specified entry.

entryAdded

protected void entryAdded(LRUCachePolicy.LRUCacheEntry entry)

Callback that signals that the given entry has been added to the cache.

entryRemoved

protected void entryRemoved(LRUCachePolicy.LRUCacheEntry entry)

Callback that signals that the given entry has been removed from the cache.

capacityChanged

protected void capacityChanged(int oldCapacity)

Callback that signals that the capacity of the cache is changed.

Parameters:

oldCapacity - the capacity before the change happened

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object