001package org.apache.commons.jcs3.engine; 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.util.concurrent.ConcurrentHashMap; 023import java.util.concurrent.ConcurrentMap; 024 025import org.apache.commons.jcs3.engine.behavior.ICache; 026import org.apache.commons.jcs3.engine.behavior.ICacheEventQueue; 027 028/** 029 * Used to associates a set of [cache listener to cache event queue] for a 030 * cache. 031 */ 032public class CacheListeners<K, V> 033{ 034 /** The cache using the queue. */ 035 public final ICache<K, V> cache; 036 037 /** Map ICacheListener to ICacheEventQueue */ 038 public final ConcurrentMap<Long, ICacheEventQueue<K, V>> eventQMap = 039 new ConcurrentHashMap<>(); 040 041 /** 042 * Constructs with the given cache. 043 * <p> 044 * @param cache 045 */ 046 public CacheListeners( final ICache<K, V> cache ) 047 { 048 if ( cache == null ) 049 { 050 throw new IllegalArgumentException( "cache must not be null" ); 051 } 052 this.cache = cache; 053 } 054 055 /** @return info on the listeners */ 056 @Override 057 public String toString() 058 { 059 final StringBuilder buffer = new StringBuilder(); 060 buffer.append( "\n CacheListeners" ); 061 buffer.append( "\n Region = " + cache.getCacheName() ); 062 buffer.append( "\n Event Queue Map " ); 063 buffer.append( "\n size = " + eventQMap.size() ); 064 eventQMap.forEach((key, value) 065 -> buffer.append( "\n Entry: key: ").append(key) 066 .append(", value: ").append(value)); 067 return buffer.toString(); 068 } 069}