content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.activemq.transport.http;
  
  import java.net.URI;
  import jakarta.servlet.ServletException;
  
  import org.apache.activemq.broker.BrokerService;
  import org.apache.activemq.transport.TransportAcceptListener;
  
  /**
   * This servlet embeds an ActiveMQ broker inside a servlet engine which is ideal
   * for deploying ActiveMQ inside a WAR and using this servlet as a HTTP tunnel.
   * 
   * 
   */
  public class HttpEmbeddedTunnelServlet extends HttpTunnelServlet {
      private static final long serialVersionUID = -3705734740251302361L;
  
      protected BrokerService broker;
      protected HttpTransportServer transportConnector;
  
      public synchronized void init() throws ServletException {
          // lets initialize the ActiveMQ broker
          try {
              if (broker == null) {
                  broker = createBroker();
  
                  // Add the servlet connector
                  String url = getConnectorURL();
                  HttpTransportFactory factory = new HttpTransportFactory();
                  transportConnector = (HttpTransportServer) factory.doBind(new URI(url));
                  broker.addConnector(transportConnector);
  
                  String brokerURL = getServletContext().getInitParameter("org.apache.activemq.brokerURL");
                  if (brokerURL != null) {
                      log("Listening for internal communication on: " + brokerURL);
                  }
              }
              broker.start();
          } catch (Exception e) {
              throw new ServletException("Failed to start embedded broker: " + e, e);
          }
          // now lets register the listener
          TransportAcceptListener listener = transportConnector.getAcceptListener();
          getServletContext().setAttribute("transportChannelListener", listener);
          super.init();
      }
  
      /**
       * Factory method to create a new broker
       * 
       * @throws Exception
       */
      protected BrokerService createBroker() throws Exception {
          BrokerService answer = new BrokerService();
          return answer;
      }
  
      protected String getConnectorURL() {
          return "http://localhost/" + getServletContext().getServletContextName();
      }
  }
  