Open minds leads to freedom

Communicating my thoughts on software development

Twitter on Scala Interview

Posted by rnaufal on 27th April 2009

There is a nice interview with the Twitter development team on Artima about using Scala in production on Twitter code. The team talks about some issues and facilities regarding the chose of Scala to develop Twitter’s queueing system and how Scala affected the team’s programming style.

My personal highlights:

And Ruby, like many scripting languages, has trouble being an environment for long lived processes. But the JVM is very good at that, because it’s been optimized for that over the last ten years..

So Scala provides a basis for writing long-lived servers…Another thing we really like about Scala is static typing that’s not painful. Sometimes it would be really nice in Ruby to say things like, here’s an optional type annotation

And because Ruby’s garbage collector is not quite as good as Java’s, each process uses up a lot of memory. We can’t really run very many Ruby daemon processes on a single machine without consuming large amounts of memory

In some cases we just decided to burrow down and use the Java collections from Scala, which is a nice advantage of Scala, that we have that option..

As I’ve learned more Scala I’ve started thinking more functionally than I did before. When I first started I would use the for expression, which is very much like Python’s. Now more often I find myself invoking map or foreach directly on iterators..

The reason you should care about immutability is that if you’re using threads and your objects are immutable, you don’t have to worry about things changing underneath you..

It’s very worth read. Post your comments here when you read it.

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Twitter Ecosystem Tools

Posted by rnaufal on 17th April 2009

I’m very impressed of how many applications are being built on top of Twitter. This simple communication tool bas became so popular that people use it to expand their business relationships, promote themselves, discover new friends, talk about stuff they like, et cetera..

Here are some tools (maybe mashups?) which use Twitter:

Here you can find other 100 Twitter Tools

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