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 */ 017 package org.apache.activemq.web.view; 018 019 import java.io.IOException; 020 import java.io.PrintWriter; 021 import java.util.Enumeration; 022 023 import javax.jms.JMSException; 024 import javax.jms.Message; 025 import javax.jms.QueueBrowser; 026 import javax.servlet.ServletException; 027 import javax.servlet.http.HttpServletRequest; 028 import javax.servlet.http.HttpServletResponse; 029 030 /** 031 * A simple rendering of the contents of a queue appear as a list of message 032 * elements which just contain an ID attribute. 033 * 034 * @version $Revision: $ 035 */ 036 public class SimpleMessageRenderer implements MessageRenderer { 037 038 private String contentType = "text/xml"; 039 private int maxMessages; 040 041 public void renderMessages(HttpServletRequest request, HttpServletResponse response, QueueBrowser browser) throws IOException, JMSException, ServletException { 042 // lets use XML by default 043 response.setContentType(getContentType()); 044 PrintWriter writer = response.getWriter(); 045 printHeader(writer, browser, request); 046 047 Enumeration iter = browser.getEnumeration(); 048 for (int counter = 0; iter.hasMoreElements() && (maxMessages <= 0 || counter < maxMessages); counter++) { 049 Message message = (Message)iter.nextElement(); 050 renderMessage(writer, request, response, browser, message); 051 } 052 053 printFooter(writer, browser, request); 054 } 055 056 public void renderMessage(PrintWriter writer, HttpServletRequest request, HttpServletResponse response, QueueBrowser browser, Message message) throws JMSException, ServletException { 057 // lets just write the message IDs for now 058 writer.print("<message id='"); 059 writer.print(message.getJMSMessageID()); 060 writer.println("'/>"); 061 } 062 063 // Properties 064 // ------------------------------------------------------------------------- 065 public int getMaxMessages() { 066 return maxMessages; 067 } 068 069 public void setMaxMessages(int maxMessages) { 070 this.maxMessages = maxMessages; 071 } 072 073 public String getContentType() { 074 return contentType; 075 } 076 077 public void setContentType(String contentType) { 078 this.contentType = contentType; 079 } 080 081 // Implementation methods 082 // ------------------------------------------------------------------------- 083 084 protected void printHeader(PrintWriter writer, QueueBrowser browser, HttpServletRequest request) throws IOException, JMSException, ServletException { 085 writer.println(""); 086 writer.print("<messages queue='"); 087 writer.print(browser.getQueue()); 088 writer.print("'"); 089 String selector = browser.getMessageSelector(); 090 if (selector != null) { 091 writer.print(" selector='"); 092 writer.print(selector); 093 writer.print("'"); 094 } 095 writer.println(">"); 096 } 097 098 protected void printFooter(PrintWriter writer, QueueBrowser browser, HttpServletRequest request) throws IOException, JMSException, ServletException { 099 writer.println("</messages>"); 100 } 101 102 }