org.globus.wsrf.utils.cache
Class LRUCache

java.lang.Object
  org.globus.wsrf.utils.cache.LRUCache

All Implemented Interfaces:

Cache, Initializable, commonj.timers.TimerListener

public class LRUCache

extends java.lang.Object

implements Initializable, commonj.timers.TimerListener, Cache

LRU cache implementation. The most recently used move to the end of the list while the least recently used stay at the beginning of the list. The least recently used (within a timeout period) are removed periodically.

Nested Class Summary

private static class

LRUCache.Entry

Field Summary

private java.util.Map	cache
private static int	DEFAULT_DELAY
private static int	DEFAULT_TIMEOUT
private long	delay
private boolean	initialized
private LinkedNodeList	list
private static org.apache.commons.logging.Log	logger
private long	timeout
private commonj.timers.Timer	timer
private commonj.timers.TimerManager	timerManager

Constructor Summary

LRUCache()

Method Summary

void	cleanExpired()
void	clear()
long	getDelay()
int	getSize()
long	getTimeout()
void	initialize()
void	remove(java.lang.Object resource)
private void	resetTimer()
private void	scheduleTimer()
void	setDelay(long delay)
void	setTimeout(long timeout)
void	timerExpired(commonj.timers.Timer timer)
void	update(java.lang.Object resource)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_TIMEOUT

private static final int DEFAULT_TIMEOUT

See Also:

Constant Field Values

DEFAULT_DELAY

private static final int DEFAULT_DELAY

See Also:

Constant Field Values

logger

private static org.apache.commons.logging.Log logger

cache

private java.util.Map cache

list

private LinkedNodeList list

timerManager

private commonj.timers.TimerManager timerManager

timer

private commonj.timers.Timer timer

timeout

private long timeout

delay

private long delay

initialized

private boolean initialized

Constructor Detail

LRUCache

public LRUCache()

Method Detail

setTimeout

public void setTimeout(long timeout)

getTimeout

public long getTimeout()

setDelay

public void setDelay(long delay)

getDelay

public long getDelay()

initialize

public void initialize()
                throws java.lang.Exception

Specified by:

initialize in interface Initializable

Throws:

java.lang.Exception

resetTimer

private void resetTimer()

scheduleTimer

private void scheduleTimer()

update

public void update(java.lang.Object resource)

Specified by:

update in interface Cache

remove

public void remove(java.lang.Object resource)

Specified by:

remove in interface Cache

clear

public void clear()

Specified by:

clear in interface Cache

getSize

public int getSize()

Specified by:

getSize in interface Cache

cleanExpired

public void cleanExpired()

timerExpired

public void timerExpired(commonj.timers.Timer timer)

Specified by:

timerExpired in interface commonj.timers.TimerListener