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ActiveMQ example source code file (SimpleMessageRenderer.java)

This example ActiveMQ source code file (SimpleMessageRenderer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

http, httpservletrequest, httpservletresponse, io, ioexception, ioexception, jmsexception, jmsexception, message, printwriter, queuebrowser, queuebrowser, request, response, servlet, servletexception, servletexception, simplemessagerenderer, string, util

The ActiveMQ SimpleMessageRenderer.java source code

/**
 * 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.view;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.QueueBrowser;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * A simple rendering of the contents of a queue appear as a list of message
 * elements which just contain an ID attribute.
 * 
 * 
 */
public class SimpleMessageRenderer implements MessageRenderer {

    private String contentType = "text/xml";
    private int maxMessages;

    public void renderMessages(HttpServletRequest request, HttpServletResponse response, QueueBrowser browser) throws IOException, JMSException, ServletException {
        // lets use XML by default
        response.setContentType(getContentType());
        PrintWriter writer = response.getWriter();
        printHeader(writer, browser, request);

        Enumeration iter = browser.getEnumeration();
        for (int counter = 0; iter.hasMoreElements() && (maxMessages <= 0 || counter < maxMessages); counter++) {
            Message message = (Message)iter.nextElement();
            renderMessage(writer, request, response, browser, message);
        }

        printFooter(writer, browser, request);
    }

    public void renderMessage(PrintWriter writer, HttpServletRequest request, HttpServletResponse response, QueueBrowser browser, Message message) throws JMSException, ServletException {
        // lets just write the message IDs for now
        writer.print("<message id='");
        writer.print(message.getJMSMessageID());
        writer.println("'/>");
    }

    // Properties
    // -------------------------------------------------------------------------
    public int getMaxMessages() {
        return maxMessages;
    }

    public void setMaxMessages(int maxMessages) {
        this.maxMessages = maxMessages;
    }

    public String getContentType() {
        return contentType;
    }

    public void setContentType(String contentType) {
        this.contentType = contentType;
    }

    // Implementation methods
    // -------------------------------------------------------------------------

    protected void printHeader(PrintWriter writer, QueueBrowser browser, HttpServletRequest request) throws IOException, JMSException, ServletException {
        writer.println("");
        writer.print("<messages queue='");
        writer.print(browser.getQueue());
        writer.print("'");
        String selector = browser.getMessageSelector();
        if (selector != null) {
            writer.print(" selector='");
            writer.print(selector);
            writer.print("'");
        }
        writer.println(">");
    }

    protected void printFooter(PrintWriter writer, QueueBrowser browser, HttpServletRequest request) throws IOException, JMSException, ServletException {
        writer.println("</messages>");
    }

}

Other ActiveMQ examples (source code examples)

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