Erlang for Java programmer - power of functions
I have been using Java for more than 10 years now, and at the time I had come across Erlang, while I was excited about what Erlang has to offer, I was a bit worried on how to survive in absence of...
View ArticleErlang for Java programmer - Design patterns, p.1
The Gamma et al. "Design patterns" book formulates common desing patterns that could be applied to any object-oriented language. When we move to functional language domain though, many OO design...
View ArticleWriting XMPP components in Erlang with exmpp
I'm going to show how to create an external XMPP component in Erlang. If you're in a hurry and familiar with ejabberd, you may want to go straight to the source code.This mini-project started when I...
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gen_component project: service discovery with exmpp
The gen_component behavior is growing up and is making more sense to me as the XMPP component project is moving along. I can even see gen_component rivaling gen_server in the nearest future :-). Jokes...
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XMPP gen_component update: Design and features
For the last few weeks I've been trying to put together a framework for creating XMPP components in Erlang. While the code I have now is not by any means covering all possible features the XMPP...
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Real-time Web applications with XMPP: working demo
Yes, this is a mid-size demo web app with XMPP, more specifically, combination of Strophe, exmpp, ejabberd on Amazon EC2. The purpose of this exercise was to create a "proof of concept" and prepare...
View ArticleIntermission: Erlang production nirvana
Well, almost. The XMPP Web demo project, despite using some of the best tools available today, is still a typical software project with bugs popping up here and there. Since it went on air couple of...
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XMPP web project walk-through
Now that the XMPP demo is online and pretty stable, I will try to explain what is it actually doing. Should have done it at the time of putting it online, but it's never too late to do a right...
View ArticleXMPP web demo update
Yesterday was a big day, I got over 100 visitors on my blog, and many of you have registered and tried the demo. Was it because of me posting about demo on identi.ca and metajack.im? Anyway, thank you...
View ArticleXMPP web demo: setting it up
I will describe the XMPP demo setup on AWS EC2, starting with Alestic Ubuntu karmic image (ami-19a34270). Hopefully, you should be able to adjust the process to your environment of choice.Setting...
View ArticleErlang for Java programmer - Java can be good at times, too
Peace and let's say no to flame wars, comrades! Don't get me wrong, Java is an awesome language, but if you have already started serious coding in Erlang, you will probably never look back. Or maybe...
View ArticleHow to make ejabberd cluster setup a bit easier
Even though there is a decent official documentation and many excellent posts on the topic of setting ejabberd cluster, it still could be confusing, as it was for me. It is possible to avoid some...
View Articlegen_client behaviour for building XMPP clients in Erlang.
The gen_client project aims to provide a structured way to write XMPP client code in Erlang. The framework heavily relies on exmpp, but also borrows some ideas from my favorite Strophe javascript...
View Articlegen_client in action: fixing temporary subscriptions
In this post I'd like to discuss one particular pubsub challenge, namely temporary subscriptions. I will also use this discussion as an opportunity to show some gen_client code that was written in...
View Articlegen_client example walk-through
In this post I will show and comment the code for the XMPP bot that solves the problem of temporary subscriptions. Please see previous post for explanation of the problem.The code is using gen_client...
View ArticleQuick fix for digest authentication
At rare times when I can't find Erlang code for things that have long been available in other languages, my pride of being Erlang programmer takes it very personally. One of these times came recently,...
View ArticleThe end of cross-domain hassle for BOSH
Exciting news to anyone who is using BOSH with ejabberd - since release 2.1.3 you don't have to proxy your http-bind link anymore. Imagine no nginx configuration, no Tape, just point exactly to...
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The gen_client v0.9: new design and features
The gen_client underwent a lot of changes over the past few months. The most significant are:Plugin framework added;Startup options introduced. The ones that work now are:"presence" - allows to...
View ArticleThe gen_client API overview
I've been using gen_client in few real projects, which helped to weed out many bugs, shape the design and evaluate features. I feel that it's now ready for public usage, so I would like to briefly...
View Articlegen_client: running BOSH and new configuration options
As a result of efforts to make gen_client run over BOSH, there are now 2 new groups of options:connection - allows to specify type of connection and its parameters. Available types are tcp, ssl and...
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