001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.activemq.plugin; 018 019import java.io.File; 020 021import org.apache.activemq.broker.Broker; 022import org.apache.activemq.broker.BrokerPlugin; 023 024/** 025 * A plugin which allows the caching of the selector from a subscription queue. 026 * <p/> 027 * This stops the build-up of unwanted messages, especially when consumers may 028 * disconnect from time to time when using virtual destinations. 029 * <p/> 030 * This is influenced by code snippets developed by Maciej Rakowicz 031 * 032 * @author Roelof Naude roelof(dot)naude(at)gmail.com 033 *@org.apache.xbean.XBean element="virtualSelectorCacheBrokerPlugin" 034 */ 035public class SubQueueSelectorCacheBrokerPlugin implements BrokerPlugin { 036 037 038 private File persistFile; 039 040 @Override 041 public Broker installPlugin(Broker broker) throws Exception { 042 return new SubQueueSelectorCacheBroker(broker, persistFile); 043 } 044 045 /** 046 * Sets the location of the persistent cache 047 */ 048 public void setPersistFile(File persistFile) { 049 this.persistFile = persistFile; 050 } 051 052 public File getPersistFile() { 053 return persistFile; 054 } 055}