org.webmacro.util
Class SimpleHashMap

java.lang.Object
  org.webmacro.util.SimpleHashMap

All Implemented Interfaces:

SimpleMap

public final class SimpleHashMap

extends java.lang.Object

implements SimpleMap

This map has a fixed number of buckets. Each bucket is an LRU cache. The map never increases the number of buckets once it has been created. The advantage is that it synchronizes on the bucket so multiple threads can access the map simultaneously without blocking, providing they access different buckets.

Constructor Summary

SimpleHashMap()
Create a new SimpleMap with 1001 LRU buckets

SimpleHashMap(int size)
Create a new SimpleMap with 'size' LRU buckets

Method Summary

void	clear()
java.lang.Object	get(java.lang.Object key) Get the value of 'key' back.
java.util.Iterator	iterator() Returns an iterator that will walk along a snapshot of the keys of this SimpleMap.
static void	main(java.lang.String[] arg)
void	put(java.lang.Object key, java.lang.Object value) Add a key to the SimpleMap.
java.lang.Object	remove(java.lang.Object key) Ensure that the key does not appear in the map

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleHashMap

public SimpleHashMap()

Create a new SimpleMap with 1001 LRU buckets

SimpleHashMap

public SimpleHashMap(int size)

Create a new SimpleMap with 'size' LRU buckets

Method Detail

put

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

Add a key to the SimpleMap.

Specified by:

put in interface SimpleMap

get

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

Get the value of 'key' back. Returns null if no such key.

Specified by:

get in interface SimpleMap

remove

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

Ensure that the key does not appear in the map

Specified by:

remove in interface SimpleMap

clear

public void clear()

Specified by:

clear in interface SimpleMap

iterator

public java.util.Iterator iterator()

Returns an iterator that will walk along a snapshot of the keys of this SimpleMap. If the Map changes during the creation of this iterator some values may be missed or included twice, but otherwise it will work. The remove() method on this iterator is well defined.

main

public static void main(java.lang.String[] arg)