net.sf.spif.persistence
Class PersistenceOptimizingHashMap

java.lang.Object
  |
  +--java.util.AbstractMap
        |
        +--java.util.HashMap
              |
              +--net.sf.spif.persistence.PersistenceOptimizingHashMap

All Implemented Interfaces:

java.lang.Cloneable, java.util.Map, java.io.Serializable

public class PersistenceOptimizingHashMap

extends java.util.HashMap

A hash map which automatically remembers it add and remove history. This history makes StorePersister able to skip unnecessary db updates, which speeds things up.

To make your db updates more affective, just use this class for your collections and make sure that you return iterators through one of the iterator methods on this class, i.e. Collections.unmodifiableCollection(myLisat).iterator will not make things any fatser.

TODO: Implement support for all methods. Currently just put, get, remove and iterator

Version:

$Id: PersistenceOptimizingHashMap.java,v 1.2 2003/02/05 22:15:48 bratseth Exp $

Author:

Jon S Bratseth

See Also:

Serialized Form

Constructor Summary

PersistenceOptimizingHashMap()

Method Summary

java.lang.Object	get(java.lang.Object key)
java.util.Iterator	iterator() The value iterator.
java.lang.Object	put(java.lang.Object key, java.lang.Object value)
void	recordChanges(boolean doRecord) Set to false to make changes which won't cause this class to feel changed or accessed.
java.lang.Object	remove(java.lang.Object key)

Methods inherited from class java.util.HashMap

clear, clone, containsKey, containsValue, entrySet, isEmpty, keySet, putAll, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

PersistenceOptimizingHashMap

public PersistenceOptimizingHashMap()

Method Detail

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

Specified by:

put in interface java.util.Map

Overrides:

put in class java.util.HashMap

get

public java.lang.Object get(java.lang.Object key)

Specified by:

get in interface java.util.Map

Overrides:

get in class java.util.HashMap

remove

public java.lang.Object remove(java.lang.Object key)

Specified by:

remove in interface java.util.Map

Overrides:

remove in class java.util.HashMap

iterator

public java.util.Iterator iterator()

The value iterator. TODO: Solve another way

recordChanges

public void recordChanges(boolean doRecord)

Set to false to make changes which won't cause this class to feel changed or accessed. This is useful to do changes which we know won't affect persistence, like sorting