src/main/java/net/floodlightcontroller/util/LRUHashMap.java

/**
*    Copyright 2011, Big Switch Networks, Inc. 
*    Originally created by David Erickson, Stanford University
* 
*    Licensed under the Apache License, Version 2.0 (the "License"); you may
*    not use this file except in compliance with the License. You may obtain
*    a copy of the License at
*
*         http://www.apache.org/licenses/LICENSE-2.0
*
*    Unless required by applicable law or agreed to in writing, software
*    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
*    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
*    License for the specific language governing permissions and limitations
*    under the License.
**/

package net.floodlightcontroller.util;

import java.util.LinkedHashMap;
import java.util.Map;

public class LRUHashMap<K, V> extends LinkedHashMap<K, V> {
    
    private static final long serialVersionUID = 1L;
    
    private final int capacity;
    public LRUHashMap(int capacity)
    {
        super(capacity+1, 0.75f, true);
        this.capacity = capacity;
    }
    
    protected boolean removeEldestEntry(Map.Entry<K,V> eldest) {
       return size() > capacity;
    }

}