org.alfresco.repo.workflow.MemoryCache.java Source code

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Here is the source code for org.alfresco.repo.workflow.MemoryCache.java

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/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco 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 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.repo.workflow;

import java.io.Serializable;
import java.util.Collection;
import java.util.Map;

import org.alfresco.repo.cache.SimpleCache;
import org.apache.commons.collections.map.LRUMap;

/**
 * A cache backed by {@link LRUMap}. Default size is provided as parameter
 *
 * @param <K>
 *            the key type
 * @param <V>
 *            the value type
 * @author bbanchev
 */
public class MemoryCache<K extends Serializable, V extends Object> implements SimpleCache<K, V> {

    /** The map. */
    private Map<K, V> map;

    /** The max size. */
    private int maxSize;

    /**
     * Instantiates a new memory cache.
     *
     * @param size
     *            the size
     */
    @SuppressWarnings("unchecked")
    public MemoryCache(int size) {

        this.maxSize = size;
        map = new LRUMap(maxSize);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.alfresco.repo.cache.SimpleCache#contains(java.io.Serializable)
     */
    @Override
    public boolean contains(K key) {
        return map.containsKey(key);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.alfresco.repo.cache.SimpleCache#getKeys()
     */
    @Override
    public Collection<K> getKeys() {
        return map.keySet();
    }

    /*
     * (non-Javadoc)
     *
     * @see org.alfresco.repo.cache.SimpleCache#get(java.io.Serializable)
     */
    @Override
    public V get(K key) {
        return map.get(key);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.alfresco.repo.cache.SimpleCache#put(java.io.Serializable,
     * java.lang.Object)
     */
    @Override
    public void put(K key, V value) {
        map.put(key, value);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.alfresco.repo.cache.SimpleCache#remove(java.io.Serializable)
     */
    @Override
    public void remove(K key) {
        map.remove(key);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.alfresco.repo.cache.SimpleCache#clear()
     */
    @Override
    public void clear() {
        map.clear();
    }

}