etri.sdn.controller.util

Class TimedCache<K>

java.lang.Object

etri.sdn.controller.util.TimedCache<K>

Type Parameters:

K - Type of the values in this cache

public class TimedCache<K>
extends java.lang.Object

The key is any object/hash-code The value is time-stamp in milliseconds The time interval denotes the interval for which the entry should remain in the hashmap. If an entry is present in the Linkedhashmap, it does not mean that it's valid (recently seen)

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.concurrent.ConcurrentMap<K,java.lang.Long>	cache
private long	timeoutInterval

Constructor Summary

Constructors

Constructor and Description
TimedCache(int capacity, int timeToLive)

Method Summary

Methods

Modifier and Type	Method and Description
long	getTimeoutInterval()
boolean	update(K key) Always try to update the cache and set the last-seen value for this key.

Methods inherited from class java.lang.Object

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

Field Detail

timeoutInterval

private final long timeoutInterval

cache

private java.util.concurrent.ConcurrentMap<K,java.lang.Long> cache

Constructor Detail

TimedCache

public TimedCache(int capacity,
          int timeToLive)

Parameters:

capacity - the maximum number of entries in the cache before the oldest entry is evicted.

timeToLive - specified in milliseconds

Method Detail

getTimeoutInterval

public long getTimeoutInterval()

update

public boolean update(K key)

Always try to update the cache and set the last-seen value for this key. Return true, if a valid existing field was updated, else return false. (note: if multiple threads update simultaneously, one of them will succeed, other wills return false)

Parameters:

key -

Returns:

boolean