001package org.apache.commons.jcs.engine.behavior; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022/** 023 * ShutdownObservers can observe ShutdownObservable objects. 024 * The CacheManager is the primary observable that this is intended for. 025 * <p> 026 * Most shutdown operations will occur outside this framework for now. The initial 027 * goal is to allow background threads that are not reachable through any reference 028 * that the cache manager maintains to be killed on shutdown. 029 * <p> 030 * Perhaps the composite cache itself should be the observable object. 031 * It doesn't make much of a difference. There are some problems with 032 * region by region shutdown. Some auxiliaries are local. They will 033 * need to track when every region has shutdown before doing things like 034 * closing the socket with a lateral. 035 * <p> 036 * @author Aaron Smuts 037 * 038 */ 039public interface IShutdownObservable 040{ 041 042 /** 043 * Registers an observer with the observable object. 044 * @param observer 045 */ 046 void registerShutdownObserver( IShutdownObserver observer ); 047 048 /** 049 * Deregisters the observer with the observable. 050 * 051 * @param observer 052 */ 053 void deregisterShutdownObserver( IShutdownObserver observer ); 054 055}