/* * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.tools.visualvm.api.caching; /** * An interface for cache * <p> * A cache is basically a map that can evict its entries according to defined TTL * or as a result of the user action * @author Jaroslav Bachorik */ abstract public class Cache<K,V> { /** * Retrieves an object from the cache by the given key<br/> * If there is no cached version of the object {@linkplain #cacheMiss(java.lang.Object) } is invoked * <p> * To obtain a cache one needs to call one of {@linkplain CacheFactory} methods * </p> * @param key The key identifying the object to be retrieved * @return Returns the cached object or NULL */ abstract public V retrieveObject(K key); abstract public V invalidateObject(K key); /** * Property getter * @return Returns TTL interval in milliseconds */ abstract public long getTTL(); /** * Property setter * @param ttl TTL interval in milliseconds */ abstract public void setTTL(long ttl); }