/*
* 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.util;
import java.io.Serializable;
import java.util.LinkedHashMap;
import java.util.Map.Entry;
/**
* Last Recent Used Map cache. See {@link LinkedHashMap} for details.
*
* @author asmirnov
*/
public class LRUMap<K, V> extends LinkedHashMap<K, V> implements Serializable {
/**
*
*/
private static final long serialVersionUID = -7232885382582796665L;
private int capacity;
/**
* Default capacity constructor
*/
public LRUMap() {
this(1000);
}
/**
* @param capacity - maximal cache capacity.
*/
public LRUMap(int capacity) {
super(capacity, 1.0f, true);
this.capacity = capacity;
}
protected boolean removeEldestEntry(Entry<K, V> entry) {
// Remove last entry if size exceeded.
return size() > capacity;
}
}