com.knowgate.cache
Class ExpireableCache

java.lang.Object
  java.lang.Thread
      com.knowgate.cache.ExpireableCache

All Implemented Interfaces:

java.lang.Runnable

Direct Known Subclasses:

AttributedExpireableCache

public class ExpireableCache
extends java.lang.Thread

This class represents a cache that automatically expires objects when a certain fillness factor is reached.

Nested Class Summary

protected class

ExpireableCache.MyHeap Implement a simple heap that just returns the smallest long variable/Object key pair.

Nested classes/interfaces inherited from class java.lang.Thread

java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler

Field Summary

protected java.util.Hashtable	cache
protected int	capacity
protected float	expire_factor
protected int	hits
protected long	max_keep_alive
protected int	misses
protected boolean	shutdown
protected ExpireableCache.MyHeap	timestamps

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

ExpireableCache(int capacity)

ExpireableCache(int capacity, float expire_factor, long max_keep_alive)

Method Summary

protected void	expireOver()
java.lang.Object	get(java.lang.Object key)
int	getCapacity()
int	getHits()
int	getMisses()
int	getUsage()
void	hit()
void	miss()
void	put(java.lang.Object key, java.lang.Object value)
void	remove(java.lang.Object key)
void	run()
void	setCapacity(int size)
void	shutdown()

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

cache

protected java.util.Hashtable cache

timestamps

protected ExpireableCache.MyHeap timestamps

capacity

protected int capacity

expire_factor

protected float expire_factor

hits

protected int hits

misses

protected int misses

shutdown

protected boolean shutdown

max_keep_alive

protected long max_keep_alive

Constructor Detail

ExpireableCache

public ExpireableCache(int capacity,
                       float expire_factor,
                       long max_keep_alive)

ExpireableCache

public ExpireableCache(int capacity)

Method Detail

put

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

get

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

remove

public void remove(java.lang.Object key)

expireOver

protected void expireOver()

setCapacity

public void setCapacity(int size)

getCapacity

public int getCapacity()

getUsage

public int getUsage()

getHits

public int getHits()

getMisses

public int getMisses()

hit

public void hit()

miss

public void miss()

shutdown

public void shutdown()

run

public void run()

Specified by:

run in interface java.lang.Runnable

Overrides:

run in class java.lang.Thread