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Eura Nova RD
Eura Nova

Activity

In this section you will find EURA NOVA’s latest news and activities.

Activity

08-02-2010

FOSDEM 2010: The Raise of the NoSQL initiative

What’s NoSQL?

Even if the name is really meaningless, the NoSQL defines a new generation of Key/value pair storage. This initiative is gaining popularity but also maturity. The FOSDEM dedicated a complete day and dev. room for this subject. The wikipedia definition defines this movement as: “NoSQL is an umbrella term for a loosely defined class of non-relational data stores that break with a long history of relational databases and ACID guarantees. Data stores that fall under this term may not require fixed table schemas, and usually avoid join operations. The term was first popularised in early 2009. Trends in computer architectures are pressing databases in a direction that requires horizontal scalability. NoSQL-style data stores attempt to address this requirement. Prominent closed-source examples are Google‘s BigTable and Amazon‘s Dynamo. Several open-source variants exist including Facebook‘s Cassandra, Apache HBase, LinkedIn‘s Project Voldemort and many others.”

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Activity

08-02-2010

FOSDEM 2010: JAIN SLEE presentation

Evangelizing JAIN SLEE in Open Source Community

This year I had a talk at the FOSDEM 2010 about the Red Hat Mobicents JAIN SLEE in the JBoss dev. room. This talk introduced the JAIN SLEE concepts and paradigms and highlighted typical usages.

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Activity

25-12-2009

Super Size EMF Fast Food Demo: Add Complex Event Processing (Part 2)

Where were we?

In the last post we considered the problem of the Integrated fast food management. In step 1, we designed the models and in step 2 we weaved them. As a result the application were developed just by weaving live-models. We finished the last post by asking ourselves how could we answer the Fast Food manager’s issues:  the boss wanted to control the burger cooking rate according to current demand. In addition, soon, he will ask to include other contextual parameters, such as the number of available seats, or the location of the truck which delivers salads and burgers.  How could we define a flexible, maintainable, and intelligent system? We proposed to use CEP concepts.

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Activity

21-12-2009

Super Size EMF Fast Food Demo: Tracking your live-models (Part 1)

Last week we submitted a talk at Eclipse Con 2010Add Complex Event Processing to your EMF models: Super Size models Fast food demo“. This is a good opportunity for explaining the concepts and architecture exposed in the talk. Actually that’s a good continuation of the last post. Indeed, we saw the M2M principles and the reasons why we needed transformation support and tracking of modifications from live-models.  Today we  put all those things in practise and dive into a real application example with live models, going further we use Complex Event Processing for injecting “intelligence” in the application.

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Activity

12-12-2009

Model transformations in new design approaches

Today we dive into a technical and theoretical track on the model transformation. In this post we investigate the existing techniques in Eclipse M2M in order to transform models, going further we replace them in the live-Model context and define what do we need to design such applications. We also present the live Weaver developed by our colleague Olivier Moises, which enables to track model changes. We will see how this kind of framework can be used in live transformation.

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Activity

23-11-2009

Atmoshpere & Asynchronous Servlet

Last week, I was at Devoxx and I attended to a speech of JF Arcan, the head architect of the Atmoshpere framework [1]. While the new coming Servlet 3.0 Async provides

  • Method to suspend a response, HttpServletRequest.startAsync()
  • Method to resume a response: AsyncContext.complete()

Atmosphere offers:

  • Annotation to suspend: @Suspend
  • Annotation or resume: @Resume
  • Annotation to broadcast (or push) events to the set of suspended responses: @Broadcast
  • Annotation to filter and serialize broadcasted events using BroadcasterFilter

In [2], JF Arcand demonstrates how Atmosphere can be used to suspend a request but also broadcasting a message to all suspended threads. Atmoshpere defines the notion of broadcastable and topics.

A topic is a kind a message channel on which broadcastable servlet can listen. Later on, any other client can broadcast messages on this topic and then reaching all suspended-threads.

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Activity

18-11-2009

DEVOXX conference Day 1 key notes: JEE 6.0

Today we had the first conference day at DEVOXX, the European JAVA meeting. The key note was, as usual, dedicated to new evolutions in the JAVA world. One of these topics was the new JAVA EE 6.0

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Activity

14-11-2009

What’s declarative Live Model-based UI?

I will inaugurate the EURA NOVA R&D director’s blog by a post on the Wazaabi framework. Actually it is a very good starting point to explain the development we led, in collaboration with Olivier Moises, about the live model UI.

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