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.transport.http; 018 019import java.net.URI; 020import javax.servlet.ServletException; 021 022import org.apache.activemq.broker.BrokerService; 023import org.apache.activemq.transport.TransportAcceptListener; 024 025/** 026 * This servlet embeds an ActiveMQ broker inside a servlet engine which is ideal 027 * for deploying ActiveMQ inside a WAR and using this servlet as a HTTP tunnel. 028 * 029 * 030 */ 031public class HttpEmbeddedTunnelServlet extends HttpTunnelServlet { 032 private static final long serialVersionUID = -3705734740251302361L; 033 034 protected BrokerService broker; 035 protected HttpTransportServer transportConnector; 036 037 public synchronized void init() throws ServletException { 038 // lets initialize the ActiveMQ broker 039 try { 040 if (broker == null) { 041 broker = createBroker(); 042 043 // Add the servlet connector 044 String url = getConnectorURL(); 045 HttpTransportFactory factory = new HttpTransportFactory(); 046 transportConnector = (HttpTransportServer) factory.doBind(new URI(url)); 047 broker.addConnector(transportConnector); 048 049 String brokerURL = getServletContext().getInitParameter("org.apache.activemq.brokerURL"); 050 if (brokerURL != null) { 051 log("Listening for internal communication on: " + brokerURL); 052 } 053 } 054 broker.start(); 055 } catch (Exception e) { 056 throw new ServletException("Failed to start embedded broker: " + e, e); 057 } 058 // now lets register the listener 059 TransportAcceptListener listener = transportConnector.getAcceptListener(); 060 getServletContext().setAttribute("transportChannelListener", listener); 061 super.init(); 062 } 063 064 /** 065 * Factory method to create a new broker 066 * 067 * @throws Exception 068 */ 069 protected BrokerService createBroker() throws Exception { 070 BrokerService answer = new BrokerService(); 071 return answer; 072 } 073 074 protected String getConnectorURL() { 075 return "http://localhost/" + getServletContext().getServletContextName(); 076 } 077}