org.griphyn.vdl.router
Class Cache

java.lang.Object
  org.griphyn.vdl.router.Cache

public class Cache
extends Object

Version:

$Revision: 50 $

Author:

Jens-S. V??ckler, Yong Zhao

Nested Class Summary

class

Cache.CacheEntry Interior class to encapsulate cached objects and their additional management keys.

Field Summary

(package private) Map	m_cache remember the objects to cache for.
(package private) static long[]	m_stats Maintains statistics.
(package private) long	m_ttl remember how long to save a cache entry.

Constructor Summary

Cache(int ttl)
ctor: Initialize the base functionalities of the cache.

Method Summary

Object	get(Object key) Requests an item from the cache.
long[]	getStatistics() Requests a copy of the statistics counters.
Object	set(Object key, Object value) Enters a value into the cache.

Methods inherited from class java.lang.Object

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

Field Detail

m_ttl

long m_ttl

remember how long to save a cache entry.

m_cache

Map m_cache

remember the objects to cache for. The cache consists of a concise key to locate any object, a value for the located large object, and a lifetime for the object.

m_stats

static long[] m_stats

Maintains statistics.

Constructor Detail

Cache

public Cache(int ttl)

ctor: Initialize the base functionalities of the cache.

Parameters:

ttl - is the lifetime of a positive entry in seconds.

Method Detail

set

public Object set(Object key,
                  Object value)

Enters a value into the cache.

Parameters:

key - is a concise, unique description of the object.

value - is the object to be cached.

Returns:

null for a fresh object, or the old CacheEntry.

get

public Object get(Object key)

Requests an item from the cache.

Parameters:

key - is the descriptor of the object.

getStatistics

public long[] getStatistics()

Requests a copy of the statistics counters.

Returns:

the counter values.