For further details take a look to the slides and Conceptual User Interface Patterns.

During the video you can see a pair of demos:

•  Essential on action doing full UI inference and code generation
• and IO, the codename for a new proof of concept UI specification and WYSIWYG prototyping tool.

La comunidad Alt.NET Hispano ha publicado la VAN (desconferencia) sobre Generación de código con Essential que tuvimos el pasado dia 11 de junio. Si estás interesado en MDD, generación de código y como aplicarlo con Essential, este video grabado para la comunidad en español es un buen punto de partida.

Mi agradecimiento a Alt.NET Hispano por el interés en la materia y la invitación a divulgarlo.

Descarga directa del video (562 Mb).

In this long post, I want to share my personal view about these days, and for sure, take note it could be partial and subjective. So, be kind to review also the comments as seen by others like Johan den Haan, Markus Völter, Angelo Hulshout, Marco Bambrilla, or Mariot Chauvin to cite a few and more expected to come. Find the majority of the pointers at the http://modeldrivensoftware.net

In this edition, the conference has been deeply covered via twitter using #cg2011 and #lwc11

As expected, I will be only be able to comment about the sessions I personally have attended. Running three tracks in parallel always force us to choose one and miss two other great sessions.

Day 0. The Language Workbenches Competition

Ten tools were presented in a marathonian session exactly allocating 40 minutes per tool. The Angelo’s egg-timer was implacable: Whenever it rang reaching the agreed time, the speakers suddenly stopped talking unable to end a simple phrase.

The challenge was a competition without a winner or loser, mainly because there was no prize to win (may be next year a generous sponsor could change that). The main objective is to compare how different tools are able to complete a common problem facing modeling, model transformations and code generation to multiple platforms.

Johan den Haan has prepared a detailed report of the tools presented. Take a look on it.

From my side, I have created a feature matrix for comparing the different approaches stressing what I see as different in each tool. It is not complete: some information is missing and some other not yet contrasted so take it as a beta version to be improved.

With respect to my beloved tool Essential, I have to say that I received a very nice feedback from the audience. See a sample of the twitted comments:

kthoms: @pmolinam Has a high voltage notebook – projector crashed on plugging in. Now let’s see how he could improvise the situation #lwc11

stevekmcc:  @pmolinam Showing #Essential: major theme is separation of concerns, so opposite to Rascal #lwc11

stevekmcc: #Essential looks very clean compared to other text or text-projection workbenches #lwc11

delphinocons: RT @stevekmcc: #Essential looks very clean compared to other text or text-projection workbenches #lwc11 <== I agree. Relaxing to the eyes.

delphinocons: #lwc11 The Essential metamodel is smaller than EMFs, and a little larger than MetaEdit+’s

meinte37: @pmolinam is the first to finish before the egg timer at #lwc11. That’s because he cuts down to the Essential-s

JohanDenHaan: @pmolinam nice presentation and demo, good mix of slides and demo. Great timing!

Day 1. Code Generation 2011 starts

I started the day giving an initial talk about Introduction to Model Driven Software Development.

Later on, Obeo guys (Mariot Chauvin & Stéphane Begaudeau) presented how to use Obeo Designer to create sensible graphical DSL tools on the top of the Eclipse framework. Obeo uses model interpretation over the EMF models to create in runtime GMF based editors.

Panel: Build or Buy – who should develop and own your DSLs and generators?

We played a nice game with the following roles:

• Juha-Pekka Tolvanen (MetaCase), the moderator
• Jos Warmer (Independent) , the homegrow tool maker
• Pedro J. Molina (Capgemini) , the consultant
• Johan den Haan (Mendix), the tool vendor

More soon than later, Andrew Watson and Markus Völter join with the rest of the audience in the discussion. Of course, there is not an easy answer to that question and depends a lot of the particular context and requiring thinking about, but not only on:

• the experience of the in-house developers with MDD
• the level of criticality of the process for the business to be automated (core or non -core to business)
• the existence of tools able to provide the requested features
• the need to split the business process from the current technology

Type Systems for DSLs.

Markus Völter presented a nice library he has been creating to help with the type checking in expressions of DSLs. After a gentle introduction to type checking, he introduced three different approaches to the problem:

• recursive type-checkers,
• union based (a la MPS) and
• table driven (a declarative way of the first one).

Day 2. Getting speed

Terrence Parr Keynote was one of the more awaited talks in the conference. Many of us use their tools on a daily basis like ANTLR and StringTemplate. So having him here is quite special. In his keynote titled “Why program by hand in five days what you can spend five years of your life automating?” he let us some pearls like the following ones highly twitteable:

• “XML is not for humans beings, just for machines.” (Donald Knuth, the father of TeX support this, and I am not going the one to contradict this)
• “Programmers are lazy.” Yes, we are. We don’t like repetition of tasks, trivial or not, because we get bored, so we always try to automate things. And this is our main driver and source of fun.
• “Automate the things more prone to human errors”. Automate the tedious work!
• Running a test does not increase the quality of the code.

MetaEdit+ Hands On

MetaCase MetaEdit+ was of my pending tools to try from previous editions of CG. I had the tool, I had the chances but not the inline tutor to allow me to get advantage of the tool. Risto, Steven and Juha-Pekka did a great work in the “hands on” session been able to not to left away any of the practitioners. They have did this lots of time and they are good teaching it.

Definitely, the learning curve of MetaEdit is not big, but for sure, you need the initial proper training to get the grasp of the tool to start creating your own graphical DSLs. Been a tool implemented in Smalltalk and using a repository, MetaEdit provided an edition experience quite different to the ones more used to edit traditional files.

Generating Graphical DSLs

Marko Boger, one of the fathers of the Poseidon tool, presented his work about applying DSLs to describe graphical DSLs. The idea was well received, and later on in the local pub called The Castle Inn an informal Birds of a Feather session was settled to create the Spray project to join forces and create a common core DSLs to help in generating graphical DSLs.

Modeling the UI

To end the day I gave a talk about how we take in account to model the User Interface of a business application. The topic is important because the IU is not always pondered as it should be. The UI is the only aspect the user will see from any system we build. Approaches to modeling and code generation based in a pattern based approach were presented with the help of briefs live demos using Essential and Io tools.

Day 3. Closing a great edition

Ed Merks Keynote

Ed is the leader of the Eclipse Modeling Framework based in Montreal and now working also for Itemis. In his keynote he remarked some of the prejudices people use to have against code generation and (UML) modeling, leaving also some great quotes:

• “Resistance is futile: Best practices will be assimilated by code generators.”
• “XMI sucks because XML sucks. XMI sucks for transitivity.”

Ed talks reinforces my idea that, talking about software, Europeans are usually more instructed in the university in formal methods and theories where Americans uses to be quite more practical and take a more empirical approach to software engineering or computer science.

It is interesting to see that mostly all the participants in the LWC with the exception of Intentional are Europeans. Well, Charles Simony (the owner) and Mats Helander (the presenter) both from Intentional are also Europeans. So, there is no interest in Language Workbenches in other continents apart from Europe?

Goldfish Bowl: “Code Generation as a normal programming practice”

Jos Warmer lead this session were all the interested participants shared thoughts about how to integrate code generation with traditional styles of development.

How to create a good template: Go to your best developers and tell them: “write this DAO code file as it were the last time in your life you are going to write it”. Then abstract it and you got it. If the further in time found a bug, they can always came back and fix the template also.

Final panel: “Models, DSLs, Transformations: The Next 5 years”

In the closing plenary session, future directions and incoming challenges were addresses by the panelist and the audience.

• Andrew Watson focused on resolving business problems instead of technological problems.
• Jos Warmer encourages us to build better tools and better languages.
• Johan den Haan pinpointed some incoming trends: Mobile, cloud, social, multi-core and poliglot languages.
• Wim Bast commented about the need for parallelization and the best way to achieve it is to move to a more declarative DSLs allowing us to exploit the intrinsic parallelization in the execution of such algorithms. Wim pointed out also about the difficulty of making prediction about the future.

So, I put my two cents remembering the genial quote of Alan Kay: “The best way to predict the future is to invent it”.

My position is that we have the tools, we have the knowledge… so, we should put all our efforts in improving the tools. Good tools will make MDD mainstream soon or later. So, I want to see it happening: let’s improve our tools now better sooner than later.

Conclusions

The LWC has been a great idea made real. Having the opportunity to compare solutions and styles of tools has been quite productive for all of us. All the participants were happy with the idea of repeating next year and the next edition is looking for the next challenge.

Twitter this years has expanded the real-time conference far away that the walls of the College. Colleagues like Rui Curado, Xavier Seignard, Jordi Cabot, Angel J. Lopez or the AltNet Hispano group to cite a few I am aware were tracking the conference and taking part via twitter. This enriches the experience and makes it more participative.

Some tools, highly integrated with the Eclipse environment were suffering during the conference live demo failures. This is not an exception, but a warning signal that some task that should be easy are getting complex and complex when the number of dependencies to run a simple task is out of control. The friction level of these environments is definitely something to keep as low as possible. Model interpretation versus traditional code generation can be helpful also to reduce startup times and opening another instance of the same environment.

The new born project Spray (as reported by Karsten) can be quite helpful as a neutral DSL definition for describing graphical DSL in an technological agnostic way. The risk however is if it is too close to a certain technology stack like GMF or Graphiti it will only be used in such context. To my understanding, a Spray definition should be implementable also in Microsoft DSL Tools  to put a extreme counterpart.

If a contest for the novel tool of the year will have ever existed in CG, IMHO this year had been awarded to The Whole Plaftorm by Riccardo Solmi and Enrico Persiani. They have a nice and cool looking projectional tool that was deeply unknown to all of us. So, welcomed to the club!

XML is definitely not for humans (Terrence Parr) and XMI sucks for XML transitivity (Ed Merks).

Finally Mark Dalgarno and his team were superb organizing all the logistics to make all of this possible. Thanks to everyone and see you there next year.

The Code Generation 2011 conference and the Language Workbenches Competition 2011 Workshop are quite close in the calendar.

I want to celebrate it with the MDD community sharing my work on Essential (a tool designed for acquiring speed with Model Driven Development). On 11th may 2011, version 0.4.44 has been released as the first public beta.

Essential is a meta-modeling and code generation tool providing specific DSLs to define and consume:

• Metamodels
• Models
• Templates (using StringTemplate) &
• Transformations (Model2Text and Model2Model)

Try it also with the sample projects created for the LWC 2011 challenge.

Finally, I will also be there presenting Essential as a solution to the challenge. It’s a nice excuse to go there, just in case!

Now I can hear in the background the sound of knives being sharpened, nevertheless with an Olympic spirit. }:)

If you want to see the State of the Art of the next generation Software Engineering tools in action, don’t miss the opportunity and join us. See you there!

I submitted a proposal with Essential for participation in LWC11. It’s going to be a great forum for comparing language workbenches capabilities and the state of the art in the area. If interested, track the progress here LCW11.

During the last weeks I’ve been working a little, replacing the old Microsoft Oslo dependencies to MGrammar inside Essential to an alternative parsing solution. The MS Oslo and later SQL Server Modeling never passed from the CTP stage and finally were discontinued. Therefore, I couldn’t ship a product in such conditions and finally decided to change it.

The Hello World sample is a nice starting point to show the syntax and capabilities of every new language. This test is also useful for code generators and Domain Specific Languages (DSLs) also as a proof of concept.

Following this honorable tradition, I have created a video showing the capabilities of Essential: the tool I am working on for doing agile Model Driven Development.

In this 10 minutes video you will get a general idea of the DSL the language provides to create:

• metamodels
• models
• templates
• and control transformations

In order to see the details, jump to Vimeo, activate the High Definition mode (HD) and set full screen (sorry embebed version is not good enough).

Essential IDE – Hello World sample from Pedro J. Molina on Vimeo.

More info about it and 12 usage scenarios in the last Code Generation 2010 presentation about Tailored Code Generators.

Share your impressions!

Currently, the main efforts on MDD, MDE, MDSD (model-driven-whatever you prefer…) are focused in the development of this kind of tools perceived as a hot research area for Software Engineering.

In this scenarion, Cambridge, at Code Generation 2010 was the perfect place for sparkling the idea of promoting a contest to show and compare the advances of different language workbenches.

The Language Workbench Competition born with the objective to serve as a point of comparison between different tools in this exciting and fast moving area.

The competition is now open to the public. So anyone interested can enroll and implement the proposed challenge just published.

On the other hand, if you want to know more about Language Workbenches, modeling and code generation add this page to you bookmarks and come back in few months to see some proposals.

The promoters of the idea are: Markus Völter, Eelco Visser, Steven Kelly, Angelo Hulshout, Jos Warmer, Bernhard Merkle, Karsten Thoms and myself.

So this a call to arms but with sportsmanship!

Angelo and Markus has already started the calling.

It also was the public presentation of Essential: the tooling supporting my approach for applying MDD. I got a very good feedback from the audience and receive many request to test the tool.

People interested in beta testing it can still enroll here.