Events notification (presentation) using WSO2 technologies

The post is about creating a dashboard to display event notifications using few of WSO2 Technologies.

Requirement : Capture events from an event sender and display it in a dashboard

Used Technologies : WSO2 Enterprise Service Bus, WSO2 Application Server, WSO2 Gadget Server

Architecture : In brief, events are generated randomly, ESB will act as an event sink, and it will publish the events to the subscribed parties (to a service deployed in WSO2 AS). There is a gadget deployed in WSO2 Gadget Server where it will poll the received events from the service periodically.

HOWTO :

The ESB

At the ESB end we will have to set up the event sink as following,

https://gist.github.com/1653037.js?file=synapse.xml

Then you need to create a topic in the ESB and subscribe the created service. Steps in doing so is documented here

The Service

A very simple service to accumulate the events (this is not at all production grade, who whats to keep all the event in memory 😉 )

https://gist.github.com/1653077.js?file=TrafficEventReceiverService.java

The Client

Its too long to post, you can check it at https://gist.github.com/1653062

You can run the client like “ant trafficevent -Dtrpurl=http://localhost:8280 -Devent=traffic.is.crazy

The Gadget
https://gist.github.com/1653079.js?file=TrfficEventGadget.xml
In Action

 

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WSO2 Gadget Server 1.3.0 is out with a bunch of awaited features

This is a short post aiming to notify the new features of WSO2 Gadget Server 1.3.0 which was released recently. The product is popular among the community as a gadget rendering platform, which provides a presentation layer for heterogeneous enterprise services based on Google Gadgets Specification and Apache Shindig. As an enterprise presentation product, the Gadget server is now fully fledged with number of awaited features such as,

And some of the important features of WSO2 Gadget Server are,

Try out The Gadget Server 1.3.0, and provide your feedback to make it better and brighter. You can provide feedback, report bugs and join in with architectural discussions at any of WSO2 public lists and also you can have a better understanding via going through many articles at WSO2 Oxygen tank.

Gadgets On the Cloud

There is no doubt that JavaScript/XML gadgets make a great presentation layer over the web with increasing amount of data floating around. The ability of which these gadgets can be embedded in any place over the web, provides a great flexibility, and a wider reach. Google does this quite nicely with their iGoogle gadgets, enabling the gadgets to be embedded in almost any web page. The success of this great idea, would be only logical if all the data, services and mashups are also available over the web with open access or maybe authenticated access. This is where a cloud story fits-in, and this the very reason why Google can do it quite easily.

However, what if you want to do everything from the scratch and also provide a great presentation layer for the users. For an instance, lets say you have a lot of financial data within your enterprise, and you need to provide some of these to your customers, to general public and some for your employees. To do this, you will have to create appropriate data services, maybe mediate or transform some data, integrate with some legacy data sources, create some business work flows, mashup them with some 3rd party services like Google finance or charts and finally expose the end results to the targeted user group. This is where WSO2 Stratos PaaS comes for your rescue 🙂

If your requirements are such, you will need a strong middle-ware platform to full fill all the above tasks, and if its all on the cloud, you will not have to worry about anything other than writing your business logic. Once the business logic is correctly compiled, you can Mashup some of your data with external service APIs, and then write the presentation logic purely on javascript and xml as XML Gadgets and expose them to the users you need. Once the gadgets are published on WSO2 Cloud Gadget Server its just a matter of linking them up in any web page you want over the web.

https://gadget.cloud.wso2.com/ifr?container=default&mid=3&nocache=1&country=US&lang=en&view=default&parent=https%3A%2F%2Fgadget.cloud.wso2.com%2F&debug=1&up_=undefined&st=john.doe%3Ajohn.doe%3A10717%3Ashindig%3Ahttp%253A//gadget.cloud.wso2.com%253A80/registry/resource/_system/config/repository/gadget-server/gadgets/ngeo_vid.xml%3A0%3Adefault&url=http%3A%2F%2Fgadget.cloud.wso2.com%3A80%2Fregistry%2Fresource%2F_system%2Fconfig%2Frepository%2Fgadget-server%2Fgadgets%2Fngeo_vid.xml#rpctoken=1304649864https://gadget.cloud.wso2.com/ifr?container=default&mid=0&nocache=1&country=US&lang=en&view=default&parent=https%3A%2F%2Fgadget.cloud.wso2.com%2F&debug=1&up_=undefined&st=john.doe%3Ajohn.doe%3A10197%3Ashindig%3Ahttp%253A//gadget.cloud.wso2.com%253A80/registry/resource/_system/config/repository/gadget-server/gadgets/soa.xml%3A0%3Adefault&url=http%3A%2F%2Fgadget.cloud.wso2.com%3A80%2Fregistry%2Fresource%2F_system%2Fconfig%2Frepository%2Fgadget-server%2Fgadgets%2Fsoa.xml#rpctoken=1304649864

The above two gadgets are taken from WSO2 Cloud Gadget Server and have linked in to this blog, to convince about the great flexibility and reach it can add-up. You do not need to use the Cloud Gadget Portal as the only place for your data to be presented (Of cause if you are not using other gadget server specific privileges such as inter-gadget communication etc). You can simply use the Gadget Server as your own gadget repository, and encourage users to discover the gadgets and embed them into their own web pages over the web.

To sum up the story I would say, try-out Stratos, try out the available services and you will definitely find out more use cases, and creative ways to use the platform and leverage the advantages of the cloud

Authoring, deploying and using XML Gadgets in WSO2 Gadget Server

We are about to release The long awaited WSO2 Gadget Server within few days of time. These few days I was doing some documentation and content writing about the Gadget Server, Apache Shindig and Google gadgets specification. My 1st article about authoring gadgets is now published on WSO2 Oxygen Tank as a help/Tutorial for Gadget server users. You can also download the Gadget Server release candidate 2 and play with it. Also Paul had written an interesting article about portals and Gadgets Server’s role.