1 package org.apache.commons.jcs3.engine.memory.fifo; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import java.io.IOException; 23 24 import org.apache.commons.jcs3.engine.behavior.ICacheElement; 25 import org.apache.commons.jcs3.engine.memory.AbstractDoubleLinkedListMemoryCache; 26 import org.apache.commons.jcs3.engine.memory.util.MemoryElementDescriptor; 27 28 /** 29 * The items are spooled in the order they are added. No adjustments to the list are made on get. 30 */ 31 public class FIFOMemoryCache<K, V> 32 extends AbstractDoubleLinkedListMemoryCache<K, V> 33 { 34 /** 35 * Puts an item to the cache. Removes any pre-existing entries of the same key from the linked 36 * list and adds this one first. 37 * <p> 38 * @param ce The cache element, or entry wrapper 39 * @return MemoryElementDescriptor the new node 40 * @throws IOException 41 */ 42 @Override 43 protected MemoryElementDescriptor<K, V> adjustListForUpdate( final ICacheElement<K, V> ce ) 44 throws IOException 45 { 46 return addFirst( ce ); 47 } 48 49 /** 50 * Does nothing. 51 * <p> 52 * @param me 53 */ 54 @Override 55 protected void adjustListForGet( final MemoryElementDescriptor<K, V> me ) 56 { 57 // DO NOTHING 58 } 59 }