/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.richfaces.cache.lru;
import java.util.PriorityQueue;
import org.richfaces.util.LRUMap;
/**
* User: akolonitsky Date: Oct 13, 2009
*/
public final class CacheMap extends LRUMap<Object, CacheEntry> {
private static final long serialVersionUID = -5422668357346537621L;
private PriorityQueue<CacheEntry> expirationQueue = new PriorityQueue<CacheEntry>();
public CacheMap() {
super();
}
public CacheMap(int capacity) {
super(capacity);
}
public PriorityQueue<CacheEntry> getExpirationQueue() {
return expirationQueue;
}
@Override
public CacheEntry put(Object key, CacheEntry value) {
CacheEntry entry = super.put(key, value);
if (entry != null) {
// prolong
expirationQueue.remove(entry);
}
if (value.getExpired() != null) {
expirationQueue.add(value);
}
return entry;
}
@Override
public CacheEntry remove(Object key) {
CacheEntry entry = super.remove(key);
if (entry != null) {
expirationQueue.remove(entry);
}
return entry;
}
@Override
public void clear() {
super.clear();
expirationQueue.clear();
}
public void purge() {
CacheEntry queueEntry = expirationQueue.peek();
while ((queueEntry != null) && queueEntry.isExpired()) {
super.remove(queueEntry.getKey());
expirationQueue.remove();
queueEntry = expirationQueue.peek();
}
}
}