Friday, July 20, 2007

Sign Your Real Name

Penelope Trunk recently wrote a blog entry on why you should blog under your real name. I agree completely with all of her points. I would also add to comment under your real name as well. Personally, I can't stand anonymous comments or even ones with nicknames. If you're going to say something, stand beside it. Don't hide. Defend it. Dig?

Monday, July 16, 2007

Bad Code

I have a thing for bad code. In fact, I've been talking every month at the Omaha Java User's Group about it every month by refactoring ugly code. Well, I ran into this article about poor practice in coding examples. Don't worry give it a quick click. It's bewildering no matter how much technology changes, bad code remains. What's even more worrisome is I see the same errors in code today. It makes me wish they gave out Code Complete to everyone.

Sunday, July 08, 2007

My Job Went To India

Sam comments on "My Job Went To India" by Chad Fowler and I think I have been too harsh with this book. I have refused to buy it from the title and especially the cover. Sam discussed the problem they had with that. When I came out of college, there was a ton of "scare" books about how all programming jobs were going overseas. Let's just say that was several years ago. I hate "scare" books and the title of Chad's book smelled of that. I refused to even open it in the store. Sam explains they wanted a funny title and it didn't sell because of that. I can understand that completely. I've heard nothing but good things about the book and maybe it's time for me to my bias aside and to read it. But, I will probably put a book cover over it because I can not stand the title or cover. Let's hope the pragmatic programmers re-title it and re-release a second edition with something less scary or funny.

Besides, if it was a joke, it wasn't funny. Scare books are cheap shots and not worthy of anyone's money. So, if they are wondering why sales were poor, I gave my reason. I trust Sam and I will probably buy it now. What a marketing mistake though.

Smalltalk Obstacles

Smalltalk has some obstacles to get over for developers interested from the outside and to take it seriously. These have always been the obstacles and they are:

  1. Different World
  2. Image-based development is strange to most developers. Also, Smalltalk forces developers to drop all of their pre-existing tools to play in this magical world. It's a lot to give up.
  3. Different Syntax
  4. Smalltalk's syntax baffles a lot of developers because it's so different from anything else. Most of what they have seen has been Algol-based. But, I've never seen a developer not understand it within a few minutes, but it is a hurdle for folks. This hurdle will always be there. Changing the syntax would make Smalltalk not Smalltalk.
  5. Unwillingness to compromise
  6. Smalltalk is powerful and the integrated tools is what makes it powerful. But, a little compromise to help developers dip their toes would help. At least allow to have some sort of training wheels before they jump in all the way. We need to allow them to test the waters.

But, the new obstacles along with the old ones are:

  1. We no longer have the largest library
  2. It's incredible the amount of open source libraries that Java and Ruby has. It's especially true for Java. It's enormous. Anything I want and it's been done. From database mapping to GUI to XML to you name it, it's just a source forge click away.
  3. Dated
  4. All dialects besides Dolphin look dated. There's no pizazz and simple things like consistent key bindings are not there. It's all a matter of polish and it shouldn't matter, but it does to a lot of developers. Sad but true. Looks matter.
  5. Tutorials
  6. There has been movement in this area recently in both Squeak and Visual Works. It's great and we need more.
  7. Marketing
  8. All of the Smalltalk web sites look old. Some graphic designers would go a long way. Ruby on Rails got to the top of the heap and exposed Ruby because of great marketing. I was programming in Ruby before Rails and it had none of the benefits of Smalltalk. We have a strong community, but marketing wins. Java kicked our butts once and at the time, we had the best libraries, environment, and everything. Marketing is king.

Now, that being said, I think a better looking Squeak, VisualWorks, and VisualAge is a must. I think they should all look at Dolphin. Dolphin is everything a modern Smalltalk should be. It's gorgeous. The key bindings are consistent, tools are easy to understand, and it's a pleasure to work with. They are also constantly adding new tools to help productivity (IdeaSpace) as well. In fact, I usually show developers Dolphin first to get them interested.

I think a good looking GUI is the first step. But, I also think making it easy for developers to use Smalltalk as a scripting language is a must too. We need to allow for developers to ease into image-based development by using their own tools. Yes, they will be less productive, but consider it to be an olive branch somewhat.

If we are to get more developers interested, we must come a little to them. I tried writing a scripting like environment for Squeak to make it easier for developers outside of Smalltalk to code in a more scripting style. And I keep playing with syntax to keep the simplicity, but also things to developers from the outside more comfortable.

And last but not least and this is a deal breaker: libraries. Seaside is a huge advantage, but we need more libraries that not only do cool things, but practical things as well. We have a lot of growth needed in this area.

The Ruby community has done a great job at showing off what you can do with pure objects and closures. Now, let's make it easy for them to see why an image and integrated tools make your live easier! We need to get off our island and start mingling with everyone. I created the Omaha Dynamic Language User's Group in the hopes to show developers what makes Smalltalk great(along with other dynamic languages as well like Lisp).

Friday, July 06, 2007

Crabs In The Pot

My good friend, Steve Wessels, wrote an excellent tutorial on Squeak development that shows how to use all of the tools while showing off what Smalltalk coding is like. I simply love it. But, I was shocked when I read Ramon Leon's comments on Steve's tutorial. While I agree that Squeak could use a marketing image overhaul, we sorely need more tutorials like Steve's. My gut instinct to Ramon's comments was, "this is like a crab trying to escape the pot, the other crabs will drag him back". Steve put a lot of work in the tutorial and it shows. Sure, he could have used all the nice add-ons, but it was meant to show developers "how to fish". Once they know the basics, then they will have enough knowledge to install those add-ons.

I feel Smalltalkers should stop complaining (about bad marketing, java, ruby, whatever) and start doing. Steve took a bold step forward and I applaud him for that. We need to have more doers and less complainers. So, if you feel marketing of Smalltalk is not up to par, do something! I started a user's group here in Omaha to get interest in dynamic languages. It's been growing larger and larger. The user group has gotten a lot of people interested not only in Smalltalk, but Lisp as well. But, I know I could do more. Steve is an inspiration and incredibly enthusiastic. If we want people to join us, we need to support the group we have now. Feedback is good and welcome, but if you feel you can do better....Well, then DO!

I didn't mean for this come out like I'm being harsh on Ramon. I don't want that. I love Ramon's writing and by having a blog, he is doing. But, I think we need to be reminded our community is small and we need to support one another. If Squeak is ugly, let's do something about it!

I wonder who will write the next tutorial on how to make Squeak look awesome? Whoever it is rock on! And I hope Steve does more tutorials, the laser game is too much fun. It shows how playful and curious Smalltalkers are and that's a great thing.

Thursday, July 05, 2007

Omaha Dynamic Language Group

Get out the thinking caps because Jay Hannah is coming to speak about how to mix Bioinformatics and Perl together perfectly. It's going to be one night that you will not forget. Jay has a love for both and he will make you a believer that Perl is more than just another scripting language.

We are sponsored this week by none other than Bass. They will bring the food and beverages.

Intelligent conversation, great food, excellent company, and it's all free. Come and see that the fuss is us.





TopicBioinformatics and Perl
SpeakerJay Hannah
TimeJuly 10, 7-9pm
LocationUNO's Peter Kiewit Institute (PKI) building
1110 South 67th Street
Omaha, NE

Tuesday, July 03, 2007

Subversion

I just want to say that I have been completely been bitten by the Subversion love bug. I've been using it for a little while. It's easy to maintain and use. Even the command line is a pleasure to work with. The API is simple and everything just works. I've yet to find anything painful. Why would anyone use CVS?

More on Exception Handling

Another great comment from Malcolm Sparks:
I complete agree with you Blaine about not throwing away information. Keep everything, and add to that information whenever you have something to add. For example, when a caller catches an exception, the caller always has some indisputable and unique information it can add: exactly what it was trying to attempt when the failure happened.

Dropping this information is like using a shredder. It's not responsible behaviour for developers to shred information that might be useful to the poor sod who had to fix your buggy code at 4am in a production environment.

Actually, such information is often the 'single golden clue' that leads to a rapid diagnosis of the error. For this reason, I believe it's justified to add such information even when unchecked exceptions occur. "Yes, you got a NullPointerException, but what exactly were you trying to do when you caught the NullPointerException?"

For that reason only, I disagree with you about catching only the most specific exception- I always catch, wrap and rethrow any subclass of java.lang.Exception. I started handling exceptions in Java this way back in 1997, and haven't seen anything since that has caused me to change my mind (but I'm open to debate).

What a great idea! I love it. I agree if you are checking for generic exceptions and then wrapping them into more domain specific for more information, then rock on. My original comment was aimed at catching generic exceptions in your code and then doing nothing with them. I still generally try to catch the things that I expect to go wrong and use my top level to catch things I didn't. Always adding more information is a good idea in my opinion especially if it gives you more context. As with any rules, it really requires thought and good judgement to make a good program right? Thanks for the suggestion!

T.H.O. Part ][

Malcolm Sparks had this to say:
I think that we a few more people with that T.H.O. attitude to prevent open-source libraries from stagnating. It is a good thing that the incumbent 'standard' library gets regularly challenged by contenders. Without continual selection and reselection, evolution dies and progress stops.

The argument that we only need just one of anything is really unhealthy. It leads to mediocrity: I present J2EE as a perfect example. One of everything you could possibly want, put it all together and what do you have? Crap.

I think you might have misunderstood me or I didn't make myself clear. My point is if you have want to do something better, then do it in the open source community. Go at it and have all the fun you want. I think the open source community needs and thrives on forward thinkers. At least there, you will have feedback, tons of people testing, and a chance for your idea to mature. But, I believe doing that on a corporate project is risky and prone to maintenance nightmares. Why? Because generally they have not gone under the same scrutiny an open source project has.

When I learn some new technique or have some crazy idea, I write it in my spare time. If I like it, I'll publish it on my site. Now, there's a lot of things that I did (like LazyCollections) that I would never do on a real project. Why? Well, LazyCollections was a chance for me to play around and try things out. I thought the experiment might be a helpful learning exercise to other people. But, the code is generally hard to understand for most developers.

I have empathy for the people that will have to maintain my code. Generally, this means I don't code things that I can, but what can be easily tested and maintained. It's not dumbing down the code or the design. Simple designs don't need tricks. They just need thought and lots of it. Simple designs are not easy and generally not the first solutions you come to. They are hard work.

Monday, July 02, 2007

Good code tells you where it hurts

I've been meaning to write an entry on exception handling and how important it is to not throw away information. So, here it is. I'll start with one my pet peeves below:
try {
...hard stuff here...
} catch(Exception problem) {
problem.printStackTrace();
}

OK, first off, I'm usually skeptical of catch all blocks at low levels. But, there can be good reasons for them, but the problem I have with code above is printing the stack to the standard out and continuing. At the very least, this is only good for when you are doing command line utilities and even then it's not good. Worse yet, this is the default from Eclipse! I've been bitten too many times where code went wrong and we couldn't find out why because the stack was written to the standard out and we couldn't see what it was. Or maddeningly the code continued and caused other problems further down. Fun to debug those problems it really is. My solution is if it's informational and you can continue log it, if not re-throw the exception. But, there's times when you catch a checked exception, but it's something that's serious enough to stop current processing. I've seen this:
try {
...something hard here...
} catch(Exception ex) {
throws new RuntimeException("Something bad happened");
}

Thankfully, I haven't seen the above code so much since 1.4 added support for wrapped exceptions. But, I still see it. The problem with the above is the original exception is dropped. When debugging or trying to find a problem, the above code gives me no information of the original context. It's useless, but it did stop bad things from happening further down. But, it would be almost possible to find out what really went wrong.

Always catch the most specific exception and leave the catch all exception handlers to the top level code. It will save you headaches, I promise you.

My rule of thumb to exception handling is: if something goes wrong, what would I want to know? I see too much code where this is forgotten or it is written as if nothing will go wrong. In a perfect world, all code works beautifully and there is no need for exception handling, but we don't live in that world. As always think about helping the poor developer that has to come behind you.

T.H.O.

T.H.O. used to be an acronym that a friend of mine would use to describe code in which it was apparent that a developer put his ego before the good of the team. The code exhibits clever behavior when a simple approach would have sufficed. But, the developer had to show off that they knew a certain trick. Sometimes, it can be more sinister. A complete library written from scratch when there are open source equivalents better tested and designed. But, they just couldn't resist doing it themselves (also known as the "not invented here" syndrome). They think they can do better. But, normally, it is some poor maintainer that has to deal with their "better" solution after they are long gone to the next T.H.O. In this day and age, I can't see how anyone can justify writing a library from scratch if there is an open source equivalent. It boggles my mind. Of course, if you think you can do better, then do so on your own open source project and live with the code before causing a maintenance nightmare for years to come. Besides, you'll get valuable feedback and fix bugs from other developers. Value simplicity and doing the least to get the most.

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