4Developers 2010 Review

I’ve been to 4Developers in 2009 in Cracow, together with Tomasz Przybysz and we had very nice impressions, no wonder then I wanted to signed up for 2010 edition in Poznań as well. Tomasz was sick, but Jakub Kurlenda decided to come with me. This time…I’ve been to 4Developers in 2009 in Cracow, together with Tomasz Przybysz and we had very nice impressions, no wonder then I wanted to signed up for 2010 edition in Poznań as well. Tomasz was sick, but Jakub Kurlenda decided to come with me. This time…

I’ve been to 4Developers in 2009 in Cracow, together with Tomasz Przybysz and we had very nice impressions, no wonder then I wanted to signed up for 2010 edition in Poznań as well. Tomasz was sick, but Jakub Kurlenda decided to come with me. This time our company was sponsoring the conference so I had a stand-up banner to carry.

Getting up at 4am is annoying, and you need to get up so early to get to Poznań by car. Thanks god it was  Friday, I could be dangerous if woken up at this hour on Saturday.

After arrival we were invited by high-heels hostesses. Now I’ll be a bit stereotypical programmer for a while: what on earth are so lovely hostesses doing on an IT conference? Yeah, sure they look nice, but hey, I thought I’m paying my money for the knowledge. If I wanted to go for good looking girls, I’d visit a local Salsa club. The best high-heels can do is distract me. And I’d rather you spend my bucks on better food, more speakers or just lower the price instead of this.

Unless, of course, these were local IT students helping for free. I strongly doubt if Poznań has so many female IT students all together in all its higher education facilities, but if that is the case, I’m starting to regret I’ve not moved to Poznań.

While I am at the organizational part, lets say that the rest was quite flawless, with tasty sandwiches, drinks, cookies and console games in between lectures. Two exceptions were: a bad lunch, served at Orbis Polonez hotel (and a total rip-off at 50zł) and no place to sit down while outside of conference rooms.

Not that we had any time, mind you. All the presentations had a tendency to take more than scheduled, and while it’s quite fine with me (it actually means there are people who’d rather listen than go for a cookie and coffee), the host didn’t seem to like it much. I think there should be more buffer time for breaks or maybe even an open space in between, to make everyone happy.

Fighting for live

Let’s get back to the lectures. The conference had four tracks, and I’ve started with ‘Fighting for live – derivatives and successors of Java are taking over the world’ by Michael Hunger. That was a big disappointment. Michael was way too theoretical. I’m afraid nothing from his speech would be useful to anyone in the room. And he didn’t give us much more than what we can actually find on wikipedia: just a brief list of some from 400+ languages running on JVM. The only interesting parts were actually played from youtube. I’ve not been waking up at 4am to watch youtube in Poznań. I can do it back home, you know.  As I said, a total disappointment.

Microsoft Cloud: Windows Azure

Angry and sad at the same time, I’ve decided to switch rooms to see Maarten Balliauw talking about Windows Azure. I’ve been thinking about using Google App Engine for my next project, so I wanted to know what Microsoft has to offer in terms of cloud computing. And boy, they do have stuff in there.

Maarten gave us a quick overview of a few projects surrounding the M$ cloud, and after that showed us how to move a simple ASP.NET application to Azure. Jakub Kurlenda, who I believe never had a chance to work with .NET, was amazed. It can't be that simple – he said – There's got to be a lot of problems with complex solutions. Well my friend, remember that M$ has inherited all the good stuff from Borland togethere with Anders Hejlsberg. Sure it sometimes doesn’t work perfectly, but still their tools are quite sexy. And way easier than anything you can find in Java world.

The Microsoft Azure does look very interesting. You get an MS SQL, Storage Service for unstructured data, front end web servers, back end servers and a AppFabric Service Bus to connect different services in a via-VPN-like manner. You even get an information marketplace Codename “Dallas”, to sell and buy services and data. Now this sound like an App Store of cloud computing, doesn’t it?

I think the war between cloud computing providers is going to be quite a show soon. And no matter whoever wins, I think that Microsoft won’t lose.

Not so Funky It Management

For the third lecture I’ve visited the IT Management track, where Peter Horsten, a guy who moved from Netherlands to Poland to create his company (Goyello) in Gdańsk, gave a speech about Funky It Management, but after half an hour I’ve returned to Java track uninspired. Peter is a great speaker, but for the first thirty minutes I heard nothing I could actually use or didn’t know already, so I wasn’t going to risk the rest of the time.

TopLink Grid and Oracle Coherence

That made me see only half of presentation from Waldemar Kot about TopLink Grid and Oracle Coherence, and I really regret that. Waldi, as he is sometimes called by friends (and notoriously by Jacek Laskowski) works for BEA… errr… Oracle, and while I do not know whether he is only consulting or also building systems for his clients, he is sharp as a Gillette, precise as a laser and full of knowledge. I really enjoyed his talk, there was a nice mix of theory and practice, and finally, some stuff I could actually use at work. Thanks Waldi.

Flex 4 and iPhone news

After a horrible lunch, Piotr Walczyszyn gave us a tutorial in using Flex 4. Years ago, I had a chance to use AMF to communicate between a heavy Flash frontend and a PHP backend, and it worked quite well. I have to note that especially debugging was nice, something I wouldn’t expect from a binary and proprietary format. For the last two years, I’ve been hearing about how easy it is to have a Java backend and Flex rich frontend. A lot of people I’ve met at the last year’s GeeCON conference actually worked that way. I was very interested in the topic and after the show I can tell you this, Flex is a way to go if you want to have a rich (heavy?) Intranet client. I think though, that its use for public/Internet services should be considered carefully. Too much bells and whistles and you are going down on frontend complexity and throughput. But you already know that, don’t you?

If using Java, I’d go for Flex 4 if Wicket is not rich enough for the solution. If Wicket is fine, I’d stay away from anything more complex (and difficult to test). I don’t have a lot of love for GWT, after what I’ve seen at work. But that could be a GXT fault, not a Google failure.

One of the most interesting news Piotr spread, was that Flex is being implemented on Android and… wait for it… iPhone! How’s that possible, you ask? We all know Apple doesn’t want to loose its AppStore market to on-line flash applications. Well, they are building a native Flex to Objective-C compiler, that’s how. If they manage to implement a runtime on Symbian and Windows Mobile, it may be the only truly portable technology. Unless you call HTML 5 a programming language, of course.

Java SE 7

After that Marcin Katas was talking about Java SE 7, which is scheduled for the end of this year. There was a lot about new Garbage Collector, that I don’t really care about, a few thing about OSGi-like solutions to dependency hell,  support for dynamic languages, new concurrency classes, closures and  Project Coin (small changes/additions to the language).

The only thing I can say is: why so late? And why so little?

Especially for Project Coin.  This is actually quite sad. Java as a language is being left behind its competitors. Really, Automatic Resource Management is a concept implemented YEARS ago with using in C#. Come on people, I’d at least expect stuff like .NET LINQ in new version of JDK, not even mentioning some long needed fixes for stuff like collections and generics. It’s been four long years since Java SE 6, there should be a Java SE 8 already.

I really think they should release a new version in a fixed interval of time, like Ubuntu is doing, like it was before Java SE 6. And forget about the hardcore backward compatibility, like with fu…-up generics. Banks that are still using J2SE 1.4 are not updating anyway.

Sobótka on Craftsmanship

And finally, I’ve been waiting for this one, Sławomir Sobótka, owner of Bottega, guy whose blog I’m actively reading, shared his thoughts about software craftsmanship.

That was by far the best presentation at the conference. Absolutely brilliant. I would not be able to put more meaningful information in such a short time and accessible way even had I tried for months. And to be honest, that was also the most important subject, useful to everyone, touching the work of every software developer in the room (and in the other .NET room as well). Kudos to you Sławek.

Too bad, there wasn’t anything new to me then. But maybe I should be actually glad, maybe it means I’m keeping up with the front line. Maybe, or maybe we are just reading the same books, groups and feeds (or I’m reading his blog actually). Anyway, I’m very happy about this lecture. What a beautiful world would it be if everyone was as passionate for craftsmanship and quality as  Sławek is.

I didn’t make it for OSGi speech from Jacek Laskowski. Sorry Jacek, but waking up at 4am doesn’t leave you a lot of strength for the last lecture. I’ve seen Jacek in action a few times, and it’s always a pleasure as he is a great showman (in a positive sense). I hope I’ll see you again at Warsaw’s JUG meetings, but now I’d rather get back to bed before midnight than get sick after the conference like all my friends did. Yeah, I’ve heard that Jakub Kurlenda got down just like Tomasz Przybysz a week ago, after the Winter Agile Tunning.

The price of knowledge has always been high, I guess.

Alltogether it was a very interesting conference and definitely worth the money.

Reviews (in Polish) from others can be seen here and here and here and here.

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Super Confitura Man

How Super Confitura Man came to be :)

Recently at TouK we had a one-day hackathon. There was no main theme for it, you just could post a project idea, gather people around it and hack on that idea for a whole day - drinks and pizza included.

My main idea was to create something that could be fun to build and be useful somehow to others. I’d figured out that since Confitura was just around a corner I could make a game, that would be playable at TouK’s booth at the conference venue. This idea seemed good enough to attract Rafał Nowak @RNowak3 and Marcin Jasion @marcinjasion - two TouK employees, that with me formed a team for the hackathon.

Confitura 01

The initial plan was to develop a simple mario-style game, with preceduraly generated levels, random collectible items and enemies. One of the ideas was to introduce Confitura Man as the main character, but due to time constraints, this fall through. We’ve decided to just choose a random available sprite for a character - hence the onion man :)

Confitura 02

How the game is played?

Since we wanted to have a scoreboard and have unique users, we’ve printed out QR codes. A person that would like to play the game could pick up a QR code, show it against a camera attached to the play booth. The start page scanned the QR code and launched the game with username read from paper code.

The rest of the game was playable with gamepad or keyboard.

Confitura game screen

Technicalities

Writing a game takes a lot of time and effort. We wanted to deliver, so we’ve decided to spend some time in the days before the hackathon just to bootstrap the technology stack of our enterprise.

We’ve decided that the game would be written in some Javascript based engine, with Google Chrome as a web platform. There are a lot of HTML5 game engines - list of html5 game engines and you could easily create a game with each and every of them. We’ve decided to use Phaser IO which handles a lot of difficult, game-related stuff on its own. So, we didn’t have to worry about physics, loading and storing assets, animations, object collisions, controls input/output. Go see for yourself, it is really nice and easy to use.

Scoreboard would be a rip-off from JIRA Survivor with stats being served from some web server app. To make things harder, the backend server was written in Clojure. With no experience in that language in the team, it was a bit risky, but the tasks of the server were trivial, so if all that clojure effort failed, it could be rewritten in something we know.

Statistics

During the whole Confitura day there were 69 unique players (69 QR codes were used), and 1237 games were played. The final score looked like this:

  1. Barister Lingerie 158 - 1450 points
  2. Boilerdang Custardbath 386 - 1060 points
  3. Benadryl Clarytin 306 - 870 points

And the obligatory scoreboard screenshot:

Confitura 03

Obstacles

The game, being created in just one day, had to have problems :) It wasn’t play tested enough, there were some rough edges. During the day we had to make a few fixes:

  • the server did not respect the highest score by specific user, it was just overwritting a user’s score with it’s latest one,
  • there was one feature not supported on keyboard, that was available on gamepad - turbo button
  • server was opening a database connection each time it got a request, so after around 5 minutes it would exhaust open file limit for MongoDB (backend database), this was easily fixed - thou the fix is a bit hackish :)

These were easily identified and fixed. Unfortunately there were issues that we were unable to fix while the event was on:

  • google chrome kept asking for the permission to use webcam - this was very annoying, and all the info found on the web did not work - StackOverflow thread
  • it was hard to start the game with QR code - either the codes were too small, or the lighting around that area was inappropriate - I think this issue could be fixed by printing larger codes,

Technology evaluation

All in all we were pretty happy with the chosen stack. Phaser was easy to use and left us with just the fun parts of the game creation process. Finding the right graphics with appropriate licensing was rather hard. We didn’t have enough time to polish all the visual aspects of the game before Confitura.

Writing a server in clojure was the most challenging part, with all the new syntax and new libraries. There were tasks, trivial in java/scala, but hard in Clojure - at least for a whimpy beginners :) Nevertheless Clojure seems like a really handy tool and I’d like to dive deeper into its ecosystem.

Source code

All of the sources for the game can be found here TouK/confitura-man.

The repository is split into two parts:

  • game - HTML5 game
  • server - clojure based backend server

To run the server you need to have a local MongoDB installation. Than in server’s directory run: $ lein ring server-headless This will start a server on http://localhost:3000

To run the game you need to install dependencies with bower and than run $ grunt from game’s directory.

To launch the QR reading part of the game, you enter http://localhost:9000/start.html. After scanning the code you’ll be redirected to http://localhost:9000/index.html - and the game starts.

Conclusion

Summing up, it was a great experience creating the game. It was fun to watch people playing the game. And even with all those glitches and stupid graphics, there were people vigorously playing it, which was awesome.

Thanks to Rafał and Michał for great coding experience, and thanks to all the players of our stupid little game. If you’d like to ask me about anything - feel free to contact me by mail or twitter @zygm0nt

Recently at TouK we had a one-day hackathon. There was no main theme for it, you just could post a project idea, gather people around it and hack on that idea for a whole day - drinks and pizza included.

My main idea was to create something that could be fun to build and be useful somehow to others. I’d figured out that since Confitura was just around a corner I could make a game, that would be playable at TouK’s booth at the conference venue. This idea seemed good enough to attract >Conclusion