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Java Source Code / Java Documentation » Database ORM » MMBase » org.mmbase.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.mmbase.util.LRUHashtable

LRUHashtable
public class LRUHashtable implements Cloneable,CacheImplementationInterface<K, V>,SizeMeasurable(Code)
A hashtable which has a maximum of entries. Old entries are removed when the maximum is reached. This table is used mostly to implement a simple caching system.
author:
   Rico Jansen
author:
   Michiel Meeuwissen
version:
   $Id: LRUHashtable.java,v 1.30 2007/08/01 06:44:43 michiel Exp $
See Also:   org.mmbase.cache.Cache

Inner Class :public class LRUEntry implements Map.Entry<K, V>,SizeMeasurable
Inner Class :protected class LRUEntrySet extends AbstractSet>
Inner Class :protected class LRUEntrySetIterator implements Iterator<Map.Entry<K, V>>
Inner Class :protected class LRUValues extends AbstractCollection


Constructor Summary
public  LRUHashtable(int size, int cap, float lf)
     Creates the URL Hashtable.
public  LRUHashtable(int size, int cap)
     Creates the URL Hashtable with growing capacity 0.75.
public  LRUHashtable(int size)
     Creates the URL Hashtable with starting capacity 101 and growing capacity 0.75.
public  LRUHashtable()
     Creates the URL Hashtable with maximum capacity 100, starting capacity 101, and growing capacity 0.75.

Method Summary
public synchronized  voidclear()
     Clears the table.
public synchronized  Objectclone()
    
public  voidconfig(Map<String, String> map)
    
public  booleancontainsKey(Object o)
    
public  booleancontainsValue(Object o)
    
public synchronized  Enumeration<V>elements()
     Returns an Enumeration on the table's element values.
public  Set<Map.Entry<K, V>>entrySet()
     Returns the entries of this Map.
public synchronized  Vget(Object key)
     Retrieves an element from the table.
public  intgetByteSize()
    
public  intgetByteSize(SizeOf sizeof)
    
public  intgetCount(Object key)
     Retrieves the count of the object with a certain key.
public  Enumeration<V>getOrderedElements()
    
public  Enumeration<V>getOrderedElements(int maxnumber)
    
public  List<? extends Map.Entry<K, V>>getOrderedEntries()
     Returns an ordered list of Map.Entry's.
public  List<? extends Map.Entry<K, V>>getOrderedEntries(int maxNumber)
     Returns an ordered list of Map.Entry's.
public  booleanisEmpty()
    
public  Set<K>keySet()
     You should only remove entries from LRUHashtable using the 'remove' function, or using the iterator of entrySet() otherwise the linked list gets messed up.
public  intmaxSize()
    
public synchronized  Vput(K key, V value)
     Store an element in the table.
public  voidputAll(Map<? extends K, ? extends V> t)
    
public synchronized  Vremove(Object key)
     Remove an element from the table.
public  voidsetMaxSize(int size)
     Change the maximum size of the table.
public  intsize()
    
public  StringtoString()
     Returns a description of the table.
public  StringtoString(boolean which)
     Returns a description of the table. The information shown includes current size, maximum size, ratio of misses and hits, and either a description of the underlying hashtable, or a list of all stored values.
Parameters:
  which - if true, the stored values are described.
public  Collection<V>values()
    


Constructor Detail
LRUHashtable
public LRUHashtable(int size, int cap, float lf)(Code)
Creates the URL Hashtable.
Parameters:
  size - the maximum capacity
Parameters:
  cap - the starting capacity (used to improve performance)
Parameters:
  lf - the amount with which current capacity frows



LRUHashtable
public LRUHashtable(int size, int cap)(Code)
Creates the URL Hashtable with growing capacity 0.75.
Parameters:
  size - the maximum capacity
Parameters:
  cap - the starting capacity (used to improve performance)



LRUHashtable
public LRUHashtable(int size)(Code)
Creates the URL Hashtable with starting capacity 101 and growing capacity 0.75.
Parameters:
  size - the maximum capacity



LRUHashtable
public LRUHashtable()(Code)
Creates the URL Hashtable with maximum capacity 100, starting capacity 101, and growing capacity 0.75.




Method Detail
clear
public synchronized void clear()(Code)
Clears the table.



clone
public synchronized Object clone()(Code)
NOT IMPLEMENTED



config
public void config(Map<String, String> map)(Code)



containsKey
public boolean containsKey(Object o)(Code)



containsValue
public boolean containsValue(Object o)(Code)



elements
public synchronized Enumeration<V> elements()(Code)
Returns an Enumeration on the table's element values.



entrySet
public Set<Map.Entry<K, V>> entrySet()(Code)
Returns the entries of this Map. Modification are reflected.
since:
   MMBase-1.6.3



get
public synchronized V get(Object key)(Code)
Retrieves an element from the table.
Parameters:
  key - the key of the element the value of the element, or null if it could not be found



getByteSize
public int getByteSize()(Code)



getByteSize
public int getByteSize(SizeOf sizeof)(Code)



getCount
public int getCount(Object key)(Code)
Retrieves the count of the object with a certain key.
Parameters:
  key - the key of the element the times the key has been requested



getOrderedElements
public Enumeration<V> getOrderedElements()(Code)



getOrderedElements
public Enumeration<V> getOrderedElements(int maxnumber)(Code)



getOrderedEntries
public List<? extends Map.Entry<K, V>> getOrderedEntries()(Code)
Returns an ordered list of Map.Entry's.
since:
   MMBase-1.6



getOrderedEntries
public List<? extends Map.Entry<K, V>> getOrderedEntries(int maxNumber)(Code)
Returns an ordered list of Map.Entry's. This can be used to present the contents of the LRU Map.
since:
   MMBase-1.6



isEmpty
public boolean isEmpty()(Code)



keySet
public Set<K> keySet()(Code)
You should only remove entries from LRUHashtable using the 'remove' function, or using the iterator of entrySet() otherwise the linked list gets messed up. The keySet of LRUHashtable therefore returns an unmodifiable set.
since:
   MMBase-1.6.3



maxSize
public int maxSize()(Code)
Return the maximum size of the table



put
public synchronized V put(K key, V value)(Code)
Store an element in the table.
Parameters:
  key - the key of the element
Parameters:
  value - the value of the element the original value of the element if it existed, null if it could not be found



putAll
public void putAll(Map<? extends K, ? extends V> t)(Code)



remove
public synchronized V remove(Object key)(Code)
Remove an element from the table.
Parameters:
  key - the key of the element the original value of the element if it existed, null if it could not be found



setMaxSize
public void setMaxSize(int size)(Code)
Change the maximum size of the table. This may result in removal of entries in the table.
Parameters:
  size - the new desired size



size
public int size()(Code)
Return the current size of the table



toString
public String toString()(Code)
Returns a description of the table. The information shown includes current size, maximum size, ratio of misses and hits, and a description of the underlying hashtable



toString
public String toString(boolean which)(Code)
Returns a description of the table. The information shown includes current size, maximum size, ratio of misses and hits, and either a description of the underlying hashtable, or a list of all stored values.
Parameters:
  which - if true, the stored values are described. a description of the table.



values
public Collection<V> values()(Code)

See Also:   LRUHashtable.keySet
since:
   MMBase-1.6.3



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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