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ActiveMQ example source code file (LRUCache.java)

This example ActiveMQ source code file (LRUCache.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

linkedhashmap, linkedhashmap, lrucache, lrucache, util, v, v

The ActiveMQ LRUCache.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.activemq.util;

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

/**
 * A Simple LRU Cache
 * 
 * 
 * @param <K>
 * @param <V>
 */

public class LRUCache<K, V> extends LinkedHashMap {
    private static final long serialVersionUID = -342098639681884413L;
    protected int maxCacheSize = 10000;

    /**
     * Default constructor for an LRU Cache The default capacity is 10000
     */
    public LRUCache() {
        this(0,10000, 0.75f, true);
    }

    /**
     * Constructs a LRUCache with a maximum capacity
     * 
     * @param maximumCacheSize
     */
    public LRUCache(int maximumCacheSize) {
        this(0, maximumCacheSize, 0.75f, true);
    }

    /**
     * Constructs an empty <tt>LRUCache instance with the specified
     * initial capacity, maximumCacheSize,load factor and ordering mode.
     * 
     * @param initialCapacity the initial capacity.
     * @param maximumCacheSize
     * @param loadFactor the load factor.
     * @param accessOrder the ordering mode - <tt>true for access-order,
     *                <tt>false for insertion-order.
     * @throws IllegalArgumentException if the initial capacity is negative or
     *                 the load factor is non-positive.
     */

    public LRUCache(int initialCapacity, int maximumCacheSize, float loadFactor, boolean accessOrder) {
        super(initialCapacity, loadFactor, accessOrder);
        this.maxCacheSize = maximumCacheSize;
    }

    /**
     * @return Returns the maxCacheSize.
     */
    public int getMaxCacheSize() {
        return maxCacheSize;
    }

    /**
     * @param maxCacheSize The maxCacheSize to set.
     */
    public void setMaxCacheSize(int maxCacheSize) {
        this.maxCacheSize = maxCacheSize;
    }

    protected boolean removeEldestEntry(Map.Entry<K,V> eldest) {
        return size() > maxCacheSize;
    }
}

Other ActiveMQ examples (source code examples)

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