001package org.apache.commons.jcs3.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; 023import java.rmi.Remote; 024 025/** 026 * Used to register interest in receiving cache changes. <br> 027 * <br> 028 * Note: server which implements this interface provides a local cache event 029 * notification service, whereas server which implements IRmiCacheWatch provides 030 * a remote cache event notification service. 031 */ 032public interface ICacheObserver extends Remote 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 /** 047 * Subscribes to all caches. 048 * 049 * @param obj 050 * object to notify for all cache changes. 051 * @throws IOException 052 */ 053 <K, V> void addCacheListener( ICacheListener<K, V> obj ) 054 throws IOException; 055 056 /** 057 * Unsubscribes from the specified cache. 058 * @param cacheName 059 * 060 * @param obj 061 * existing subscriber. 062 * @throws IOException 063 */ 064 <K, V> void removeCacheListener( String cacheName, ICacheListener<K, V> obj ) 065 throws IOException; 066 067 /** 068 * Unsubscribes from all caches. 069 * 070 * @param obj 071 * existing subscriber. 072 * @throws IOException 073 */ 074 <K, V> void removeCacheListener( ICacheListener<K, V> obj ) 075 throws IOException; 076}