Building the Server-Side of the "Tour de Flex" Real-Time Dashboard

Greg Wilson and Damien Mandrioli are also blogging about the new Tour de Flex real time dashboard today. Greg is the inspiration behind everything “Tour de Flex”, including the idea of the dashboard. He has the story behind the genesis of this project on his blog. Damien (from IBM/ILOG) did a fantastic job at building the client-side of the dashboard using the very cool ILOG Elixir components, and he walks you through the details on his blog.

My contribution to the project is the “real-time messaging” infrastructure. I provide the details below.

First the overall workflow…

The reason we are combining PHP and Java in this workflow is mostly historical. In the initial version of Tour de Flex, there was no Java involved: Greg was persisting loaded samples data (sample id and timestamp) directly from his PHP page. We later added LiveCycle Data Services to the picture to support the data push requirement of the dashboard, and we took the opportunity to move some code (such as the database persistence) from PHP to Java. Note that we are using LCDS for the performance and scalability of its high-end channels, but the application could also be deployed on BlazeDS.

A more straightforward architecture would be for the client to communicate directly with LCDS. For example, the client could invoke a remote object that would directly publish the loaded sample data (sample id and geolocation of the client) to the message destination. Alternatively, the client could use a Producer object to directly publish the message to the destination. Because some logic (such as geolocating the IP address and persisting the data) has to be executed at the server-side before routing the messages to the subscribed clients, you would have to write a custom message adapter if you used this approach.

We will probably streamline the workflow with one of these two approaches in the future, but in the meantime here is the source code for the servlet (logging and non-essential code removed for brevity):

package com.adobe.tdf;

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

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.maxmind.geoip.Location;
import com.maxmind.geoip.LookupService;

import flex.messaging.MessageBroker;
import flex.messaging.messages.AsyncMessage;
import flex.messaging.util.UUIDUtils;

public class TDFServlet extends HttpServlet {

	// Unique clientID for the message service
	private String clientID = UUIDUtils.createUUID();

	// The geocoding service
	protected LookupService lookupService;

	// A DAO to store sample requests in a database
	protected SampleRequestDAO dao = new SampleRequestDAO();

	// The LCDS message broker
	protected MessageBroker messageBroker;

	// The LCDS messaging destination where real time sample requests information is pushed
	protected String destination;

	public void init() throws ServletException {

		ServletConfig config = getServletConfig();
		destination = config.getInitParameter("messaging.destination.name");
		String path = config.getInitParameter("geocoding.database.path");
		try {
			// Load the geocoding database in init() to make sure we load it only once
			lookupService = new LookupService(path, LookupService.GEOIP_MEMORY_CACHE);
		} catch (IOException e) {
			// We swallow the exception here. If the database is not available, the feed
			// will still work but won't provide the location info.
		}
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		if (messageBroker == null)
		{
			messageBroker = MessageBroker.getMessageBroker(null);
		}

		SampleRequest sampleRequest = new SampleRequest();

		try {
			sampleRequest.setSampleId(Integer.parseInt(request.getParameter("sampleId")));
		} catch (Exception e) {
			String message = "A valid sampleId is required to process this request";
			throw new RuntimeException(message);
		}

		sampleRequest.setTimestamp(new Date());

		String ipAddress = request.getParameter("ipAddress");

		// Geolocate the IP address and add the info to the message
		if (lookupService != null && ipAddress != null)
		{
	                Location location = lookupService.getLocation(ipAddress);
			if (location != null)
			{
				sampleRequest.setLatitude(location.latitude);
				sampleRequest.setLongitude(location.longitude);
				sampleRequest.setCountry(location.countryCode);
				sampleRequest.setCity(location.city);
			}
		}

		try {
			dao.create(sampleRequest, ipAddress);
		} catch (RuntimeException e) {

		}

		String subtopic = request.getParameter("subtopic");
		if (subtopic == null) subtopic = "flex";

		// Publish the message to specified destination and subtopic.
		AsyncMessage msg = new AsyncMessage();
		msg.setDestination(destination);
		msg.setHeader("DSSubtopic", subtopic);
		msg.setClientId(clientID);
		msg.setMessageId(UUIDUtils.createUUID());
		msg.setTimestamp(System.currentTimeMillis());
		msg.setBody(sampleRequest);
		messageBroker.routeMessageToService(msg, null);

		PrintWriter out = response.getWriter();
	        out.println("<html><body>ok</body></html>");

	}

}

The servlet is responsible for three things:

  1. Geolocate the IP address of the client requesting the sample. We currently use the MaxMind Geolocation API. The API is straightforward and the results seem pretty accurate.
  2. Save the information about the loaded sample in a database. We keep track of historical data to be able to support future data visualization projects.
  3. Publish the data about the loaded sample to a message destination. The servlet uses the Message Service Java API to directly push messages to the Flex destination (lines 97 to 104). Note that the same API exists for ColdFusion, so CF developers could use a CF page instead of this servlet to push messages to the client.

Channels

The messaging destination is set up to support different communication channels: RTMP, long polling, and regular polling. The client-side developer can decide which channel to use to communicate with the server. For example, if you wanted to use RTMP as the primary channel, fall back to long polling if the RTMP connection fails, and fall back to regular polling if the long polling connection fails you could set up your client-side ChannelSet as follows:

<mx:ChannelSet id="channelSet">
	<mx:RTMPChannel id="rtmp" url="rtmp://hostname:2037"/>
	<mx:AMFChannel url="http://hostname/context/messagebroker/amflongpolling"/>
	<mx:AMFChannel url="http://hostname/context/messagebroker/amfpolling"/>
</mx:ChannelSet>

75 Responses to Building the Server-Side of the "Tour de Flex" Real-Time Dashboard

  1. Michael Chaize May 26, 2009 at 2:51 pm #

    Bravo Christophe! and thanks for the details about the architecture.
    What is the name of the PHP function used to send a HTTP Request to the servlet ? Just a redirection ?

  2. Натан May 29, 2009 at 5:44 pm #

    Вполне возможно. Иногда так случается.

  3. Jonas Windey June 12, 2009 at 4:21 am #

    Thanks for the insight on your server-side architecture. I have a specific question though and I think you’re one of the only one who could answer it after searching about every LCDS guide there is. My problem is that I would like to do a server-side commit of data that is created using Livecycle data services, from a servlet or even from a regular java application. If I follow your way of working, I can do it to push data through a normal messaging service, but publishing a commit of a managed data object seems a bit harder. Is there any information on how to create the body object serverside so that it’s understood by the LCDS data service? I’m really curious in knowing this answer. I already posted this to the adobe forums, but no response there.

    Feel free to contact me, it would be very highly appreciated. Thanks!

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    Is there any reason why this does not work on OS X either in AIR or in the browser (firefox or safari). The feed status never goes to anything other then red however the flash player does lockup both browser causes the need to do a force quit. This does not seem to be network dependent because in a windows vmware image it works without problem.

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    Hi

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    Its based on the same principles as the tour de flex application but uses the Red5 RTMP to accomplish the updations through real push technique. It monitors site traffic in real time.

  45. hagel IT-Service Ham December 19, 2009 at 7:33 am #

    Great post, thanks.

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    I have worked with servers over the years and find this post absolutely fascinating, although I may need to come back and re-read to totally comprehend it.

  47. David March 9, 2010 at 5:25 am #

    Hi Christophe,

    It seems this blog entry has been spamed attacked, I hope you get this message.

    Could you post the Channel definitions you used for the RTMP, AMF3Polling and AMF. I always have trouble deciding what values to put where.

    Thank you.

    David

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    Hi

    Could you please share the source code for this application.
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    Thanks

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    Is it possible to do a real time app such as a trading app or an auction over HTTP ports 80/443 using these technologies? For example, running a servlet backend with a jms que and flex on the front end.

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Trackbacks/Pingbacks

  1. Tour de Flex Live Planetary Dashboard « Greg Wilson’s Ramblings - May 26, 2009

    […] Christophe Coenraets provides all of the details including source code related to the messaging in his blog post. […]

  2. ILOG Elixir Blog » Blog Archive » Tour de Flex Realtime Dashboard - May 26, 2009

    […] Building the Server-Side of the “Tour de Flex” Real-Time Dashboard […]

  3. Tour de Flex « Code moi un mouton - May 26, 2009

    […] Tour de Flex. L’architecture a été construite par notre maitre à tous , Christophe Coenraets, et elle est détaillée sur ce post. L’application Dashboard utilise le composant de […]

  4. Flex Data Visualization Contest Announcement « Greg Wilson’s Ramblings - June 8, 2009

    […] You can find more information about the existing dashboard in my previous blog post and Christophe’s recent blog post. […]

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