wls pubsub server

 IT trends 2010 series (2)

com.bea.httppubsub.BayeuxMessage

Develop steps

1. weblogic.xml library-ref
   
2. weblogic-pubsub.xml  (weblogic-pubsub.xsd)
   
   

3. PubSub API for publish, filter, dynamic channel (optional)
   lookup pubsub server & create local client
           publish to channel
           subscribe (listener register)
           filter chain (filter class, config chain)
   APIS:
           com.bea.httppubsub.PubSubServer
           LocalClient
           ClientManager
           MessageFilter
           DeliveredMessageListener
           BayeuxMessage
   
4. Add Dojo to jsp/html for publish/subscribe msg.
   //Initialize the Dojo cometd environment
   dojo.io.cometd.init({}, "/context/cometd");
       cometd - matching default pubsub war web.xml
   
   //Publish a message to a channel
   dojo.io.cometd.publish("/a/channel", "message content");   //publish text msg
   dojo.io.cometd.publish("/a/channel", {"data": "content"}); // JSON object
   
   //Subscribe to a channe
   dojo.io.cometd.subscribe("/a/channel", null, "onUpdate");
   
           //JS function for call back
           function onUpdate(message) {
             if (!message.data) {
               alert("bad message format "+message);
                 return;
             }
             // fetch the data published by other clients
             var data = message.data;
           }
5. Deploy web-app; pubsub war library  WL_HOME/common/deployable-libraries
   
6. Other aspects
   
   
   • Persistent Channelsweblogic-pubsub.xml  persistent-client-timeout-secs
     

   • JMS as provider for cluster support weblogic-pubsub.xml
     
     

            t3://localhost:7001
            ConnectionFactoryJNDI
            TopicJNDI

   • Requiring SSL for pub-sub Via web.xml INTEGRAL
     
   • AuthCookieEnabled to Access SSL resources
_WL_AUTHCOOKIE_JSESSIONID created (cookie or URL rewrite). This is default behavior
     
   •  Locking Down the Pub-Sub Server (5-*)
     
   *Configure SSL for pub-sub.
   *Require authentication (BASIC, FORM, and so forth.)
   *Ensure auth-cookie is enabled.
   *Ensure that all the channels are constrained in the weblogic-pubsub.xml file.
   *Lock subscribe operations, which are allowed by default.