Tagged with "java"
Concurrency and Me
I got to play with the java.util.concurrent package today and I have to admit that after some of the lessons I’ve learned in Scala it didn’t seem nearly as scary as all these people make it out to be. Of course I suppose that part of the danger is exactly that it doesn’t seem difficult but I’m optimistic.
The reason I was playing with it at all is because I’m trying to export data from Google Sites but the current exporter was producing broken links and a lot of HTML cruft. Admittedly the cruft is most likely from the generated markup and not the export but I wanted to try and clean it up anyway. Since it was open source I pulled it down (and imported it into git from mercurial) and started hacking away.
The easiest way I could think of to do XML manipulation was to include Scala and use it’s builtin libraries but after I did that I noticed the export was ‘hanging’ so I looked at the processes and saw it was only using the main thread so I hacked in some multi-threaded support with Executors. It isn’t perfect and I broke some tests but I can export most of my data in a timely fashion now. The work I did on this is visible on github
Entity in Google AppEngine
If no id is provided when saving the Datastore will generate one. I didn’t find this documented anywhere and it is only vaguely implied by the Javadocs.
If you post an advert for a Haskell developer you will get 20 applicants. All of those people will be the kind of developer who learns new programming languages to improve their own abilities and stretch themselves, because nobody yet learns Haskell just to get a job.
If you post an advert for a Java developer you will get 200 applicants. Most of them will be the kind of developer who learned Java because there are lots of Java jobs out there, and as long as they know enough to hold down a job then they see no reason to learn anything.
