org.castor.cache.hashbelt.container

Class MapContainer

java.lang.Object

java.util.AbstractMap

org.castor.util.concurrent.ConcurrentHashMap

org.castor.cache.hashbelt.container.MapContainer

All Implemented Interfaces:

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

public final class MapContainer
extends ConcurrentHashMap
implements Container

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: 5951 $ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr 2006) $

Author:

Gregory Block, Ralf Joachim

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.castor.util.concurrent.ConcurrentHashMap

ConcurrentHashMap.Entry, ConcurrentHashMap.HashIterator, ConcurrentHashMap.KeyIterator, ConcurrentHashMap.Segment, ConcurrentHashMap.ValueIterator

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

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

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

java.util.Map.Entry<K,V>

Field Summary

Fields inherited from class org.castor.util.concurrent.ConcurrentHashMap

CONCURRENCY_LEVEL, DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, entrySet, keySet, loadFactor, SEGMENT_MASK, segments, table, threshold, values, votesForResize

Constructor Summary

Constructors

Constructor and Description
MapContainer()

Method Summary

Methods

Modifier and Type	Method and Description
long	getTimestamp() Returns the timestamp of this container.
java.util.Iterator	keyIterator() Returns an iterator over the keys contained in this container.
void	updateTimestamp() Set the timestamp of this container to System.currentTimeMillis().
java.util.Iterator	valueIterator() Returns an iterator over the values contained in this container.

Methods inherited from class org.castor.util.concurrent.ConcurrentHashMap

bitcount, clear, clone, contains, containsKey, containsValue, elements, entrySet, eq, get, hash, isEmpty, keys, keySet, newTable, put, putAll, rehash, remove, remove, resize, 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

See Also:

Container.updateTimestamp()

getTimestamp

public long getTimestamp()

Returns the timestamp of this container.

Specified by:

getTimestamp in interface Container

Returns:

The timestamp.

See Also:

Container.getTimestamp()

keyIterator

public java.util.Iterator 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

Returns:

An iterator over the keys currently contained in the container.

See Also:

Container.keyIterator()

valueIterator

public java.util.Iterator 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

Returns:

An iterator over the values currently contained in the container.

See Also:

Container.valueIterator()