org.castor.cache.hashbelt.container
Class MapContainer<K,V>

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.HashMap<K,V>
          org.castor.cache.hashbelt.container.MapContainer<K,V>

Type Parameters:

K - the type of keys maintained by this cache

V - the type of cached values

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>, Container<K,V>

public final class MapContainer<K,V>
extends HashMap<K,V>
implements Container<K,V>

A very basic, HashMap-based implementation of the hashmap container strategy, using nothing more than a basic hashmap to store key/value pairs. This works well for lots of gets and a reasonably high volume of removes; if few removes are required, and iterators are important to your particluar use-case of the cache, it's better to use the FastIteratingContainer, which can handle iterating at a higher speed, still has a map for accessing hash values, but has a higher removal cost.

Since:

1.0

Version:

$Revision: 9040 $ $Date: 2011-08-16 08:26:59 +0200 (Di, 16 Aug 2011) $

Author:

Gregory Block, Ralf Joachim

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

MapContainer()

Method Summary

long	getTimestamp() Returns the timestamp of this container.
Iterator<K>	keyIterator() Returns an iterator over the keys contained in this container.
void	updateTimestamp() Set the timestamp of this container to System.currentTimeMillis().
Iterator<V>	valueIterator() Returns an iterator over the values contained in this container.

Methods inherited from class java.util.HashMap

clear, clone, containsKey, containsValue, entrySet, get, isEmpty, keySet, put, putAll, remove, 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

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, values

Constructor Detail

MapContainer

public MapContainer()

Method Detail

updateTimestamp

public void updateTimestamp()

Set the timestamp of this container to System.currentTimeMillis().

Specified by:

updateTimestamp in interface Container<K,V>

getTimestamp

public long getTimestamp()

Returns the timestamp of this container.

Specified by:

getTimestamp in interface Container<K,V>

Returns:

The timestamp.

keyIterator

public Iterator<K> keyIterator()

Returns an iterator over the keys contained in this container. If the container is modified while an iteration is in progress, the results of the iteration is not affected and vice-versa.

Specified by:

keyIterator in interface Container<K,V>

Returns:

An iterator over the keys currently contained in the container.

valueIterator

public Iterator<V> valueIterator()

Returns an iterator over the values contained in this container. If the container is modified while an iteration is in progress, the results of the iteration is not affected and vice-versa.

Specified by:

valueIterator in interface Container<K,V>

Returns:

An iterator over the values currently contained in the container.