| package org.apache.commons.jcs3.engine.memory.mru; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.jcs3.engine.behavior.ICacheElement; |
| import org.apache.commons.jcs3.engine.memory.AbstractDoubleLinkedListMemoryCache; |
| import org.apache.commons.jcs3.engine.memory.util.MemoryElementDescriptor; |
| |
| /** |
| * The most recently used items move to the front of the list and get spooled to disk if the cache |
| * hub is configured to use a disk cache. |
| */ |
| public class MRUMemoryCache<K, V> |
| extends AbstractDoubleLinkedListMemoryCache<K, V> |
| { |
| /** |
| * Adds the item to the front of the list. A put doesn't count as a usage. |
| * <p> |
| * It's not clear if the put operation should be different. Perhaps this should remove the oldest |
| * if full, and then put. |
| * <p> |
| * @param ce |
| * @return MemoryElementDescriptor the new node |
| * @throws IOException |
| */ |
| @Override |
| protected MemoryElementDescriptor<K, V> adjustListForUpdate( final ICacheElement<K, V> ce ) |
| throws IOException |
| { |
| return addFirst( ce ); |
| } |
| |
| /** |
| * Makes the item the last in the list. |
| * <p> |
| * @param me |
| */ |
| @Override |
| protected void adjustListForGet( final MemoryElementDescriptor<K, V> me ) |
| { |
| list.makeLast( me ); |
| } |
| } |