Event/Observer Driven Ruby on Rails

ruby ruby-on-rails-3 listener event-driven
Drew picture Drew · Jan 14, 2011 · Viewed 9.5k times · Source

I have an application that lends itself to an event/listener model. Several different kinds of data get published (event), then many different things may or may not need to act on that data (listeners). There's no specific order the listeners need to happen in and each listener would determine whether or not it needs to act on the event.

What tools for Rails apps are there to accomplish this task? I'm hoping to not have to do this myself (although, I can. It's not THAT big a deal.)

Edit: Observer pattern might be a better choice for this

Answer

Adam Harte picture Adam Harte · Jan 14, 2011

Check out EventMachine. It is a very popular event-processing library for Ruby. It looks quite good, and a lot of other libraries seem to take advantage of it (Cramp).

Here is a good introduction: http://rubylearning.com/blog/2010/10/01/an-introduction-to-eventmachine-and-how-to-avoid-callback-spaghetti/

Related questions

How to get a random number in Ruby

How do I generate a random number between 0 and n?

Read More
How to remove a key from Hash and get the remaining hash in Ruby/Rails?

To add a new pair to Hash I do: {:a => 1, :b => 2}.merge!({:c => 3}) #=> {:a => 1, :b => 2, :c => 3} Is there a similar way to delete a key from Hash ? This works: {:a => 1, :b => 2}.…

Read More
Replace words in a string - Ruby

I have a string in Ruby: sentence = "My name is Robert" How can I replace any one word in this sentence easily without using complex code or a loop?

Read More