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 022import java.io.IOException; 023 024/** 025 * Used to register interest in receiving cache changes. <br> 026 * <br> 027 * Note: server which implements this interface provides a local cache event 028 * notification service, whereas server which implements IRmiCacheWatch provides 029 * a remote cache event notification service. 030 * 031 */ 032public interface ICacheObserver 033{ 034 /** 035 * Subscribes to the specified cache. 036 * 037 * @param cacheName 038 * the specified cache. 039 * @param obj 040 * object to notify for cache changes. 041 * @throws IOException 042 */ 043 <K, V> void addCacheListener( String cacheName, ICacheListener<K, V> obj ) 044 throws IOException; 045 046 //, CacheNotFoundException; 047 048 /** 049 * Subscribes to all caches. 050 * 051 * @param obj 052 * object to notify for all cache changes. 053 * @throws IOException 054 */ 055 <K, V> void addCacheListener( ICacheListener<K, V> obj ) 056 throws IOException; 057 058 /** 059 * Unsubscribes from the specified cache. 060 * @param cacheName 061 * 062 * @param obj 063 * existing subscriber. 064 * @throws IOException 065 */ 066 <K, V> void removeCacheListener( String cacheName, ICacheListener<K, V> obj ) 067 throws IOException; 068 069 /** 070 * Unsubscribes from all caches. 071 * 072 * @param obj 073 * existing subscriber. 074 * @throws IOException 075 */ 076 <K, V> void removeCacheListener( ICacheListener<K, V> obj ) 077 throws IOException; 078}