org.codehaus.cake.cache.policy.paging.FIFOReplacementPolicy Maven / Gradle / Ivy

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/*
 * Copyright 2008 Kasper Nielsen.
 * 
 * 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://cake.codehaus.org/LICENSE
 * 
 * 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.codehaus.cake.cache.policy.paging;

import org.codehaus.cake.cache.CacheEntry;
import org.codehaus.cake.cache.policy.spi.AbstractDoubleLinkedReplacementPolicy;

/**
 * A FIFO based replacement policy.
 * 
 * @author Kasper Nielsen
 * @version $Id: FIFOPolicy.java 536 2007-12-30 00:14:25Z kasper $
 * @param 
 *            the type of keys maintained by the cache
 * @param 
 *            the type of values maintained by the cache
 */
public class FIFOReplacementPolicy extends AbstractDoubleLinkedReplacementPolicy {

    /** A unique policy name. */
    public static final String NAME = "FIFO";

    /** {@inheritDoc} */
    public boolean add(CacheEntry entry) {
        addFirst(entry);
        return true;
    }

    /** {@inheritDoc} */
    public CacheEntry evictNext() {
        return removeFirst();
    }
}