/**
* This file is part of Waarp Project.
*
* Copyright 2009, Frederic Bregier, and individual contributors by the @author tags. See the
* COPYRIGHT.txt in the distribution for a full listing of individual contributors.
*
* All Waarp Project is free software: you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* Waarp is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along with Waarp. If not, see
* <http://www.gnu.org/licenses/>.
*/
package org.waarp.common.lru;
/**
* @author Frederic Bregier
* @author Damian Momot
*
*/
class StrongReferenceCacheEntry<V> implements InterfaceLruCacheEntry<V> {
private final V value;
private long expirationTime;
/**
* Creates StrongReferencyCacheEntry with desired ttl
*
* @param value
* @param ttl
* time to live in milliseconds
* @throws IllegalArgumentException
* if ttl is not positive
*/
StrongReferenceCacheEntry(V value, long ttl) {
if (ttl <= 0)
throw new IllegalArgumentException("ttl must be positive");
this.value = value;
expirationTime = System.currentTimeMillis() + ttl;
}
/**
* Returns value if entry is valid, null otherwise.
*
* Entry is invalid if it's expired
*
* @return value if entry is valid
*/
public V getValue() {
if (System.currentTimeMillis() > expirationTime)
return null;
else
return value;
}
public boolean isStillValid(long timeRef) {
return (timeRef <= expirationTime);
}
public boolean resetTime(long ttl) {
expirationTime = System.currentTimeMillis() + ttl;
return true;
}
}