/*
* 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.web;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.Queue;
import javax.jms.QueueBrowser;
import javax.jms.Session;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.activemq.util.FactoryFinder;
import org.apache.activemq.util.IntrospectionSupport;
import org.apache.activemq.web.view.MessageRenderer;
import org.apache.activemq.web.view.XmlMessageRenderer;
/**
* Renders the contents of a queue using some kind of view. The URI is assumed
* to be the queue. The following parameters can be used
* <p/>
* <ul>
* <li>view - specifies the type of the view such as simple, xml, rss</li>
* <li>selector - specifies the SQL 92 selector to apply to the queue</li>
* </ul>
*
*
*/
public class QueueBrowseServlet extends HttpServlet {
private static FactoryFinder factoryFinder = new FactoryFinder("META-INF/services/org/apache/activemq/web/view/");
// Implementation methods
// -------------------------------------------------------------------------
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
WebClient client = WebClient.getWebClient(request);
Session session = client.getSession();
Queue queue = getQueue(request, session);
if (queue == null) {
throw new ServletException("No queue URI specified");
}
String msgId = request.getParameter("msgId");
if (msgId == null) {
MessageRenderer renderer = getMessageRenderer(request);
configureRenderer(request, renderer);
String selector = getSelector(request);
QueueBrowser browser = session.createBrowser(queue, selector);
renderer.renderMessages(request, response, browser);
}
else {
XmlMessageRenderer renderer = new XmlMessageRenderer();
QueueBrowser browser = session.createBrowser(queue, "JMSMessageID='" + msgId + "'");
if (!browser.getEnumeration().hasMoreElements()) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
Message message = (Message) browser.getEnumeration().nextElement();
PrintWriter writer = response.getWriter();
renderer.renderMessage(writer, request, response, browser, message);
writer.flush();
}
}
catch (JMSException e) {
throw new ServletException(e);
}
}
protected MessageRenderer getMessageRenderer(HttpServletRequest request) throws IOException, ServletException {
String style = request.getParameter("view");
if (style == null) {
style = "simple";
}
try {
return (MessageRenderer) factoryFinder.newInstance(style);
}
catch (IllegalAccessException e) {
throw new NoSuchViewStyleException(style, e);
}
catch (InstantiationException e) {
throw new NoSuchViewStyleException(style, e);
}
catch (ClassNotFoundException e) {
throw new NoSuchViewStyleException(style, e);
}
}
@SuppressWarnings("unchecked")
protected void configureRenderer(HttpServletRequest request, MessageRenderer renderer) {
Map<String, String> properties = new HashMap<String, String>();
for (Enumeration<String> iter = request.getParameterNames(); iter.hasMoreElements();) {
String name = (String) iter.nextElement();
properties.put(name, request.getParameter(name));
}
IntrospectionSupport.setProperties(renderer, properties);
}
protected String getSelector(HttpServletRequest request) {
return request.getParameter("selector");
}
protected Queue getQueue(HttpServletRequest request, Session session) throws JMSException {
String uri = request.getPathInfo();
if (uri == null) {
return null;
}
// replace URI separator with JMS destination separator
if (uri.startsWith("/")) {
uri = uri.substring(1);
if (uri.length() == 0) {
return null;
}
}
uri = uri.replace('/', '.');
return session.createQueue(uri);
}
}