EM::Deferrable replacement

[Bernard Potocki]

I'm currently using EventMachine, but Cool.IO seems nicer to me(and I think that libev is faster that libevent), but after checking all source I can't find anything like EM::Deferrable - is it unnecessary in Cool.IO or it is just not implemented yet?

[Tony Arcieri]

There's nothing like EM::Deferrable right now, sorry. I'll leave this ticket open as a feature request.

[Bernard Potocki]

Then is there suggested way to write long running tasks that will not lock reactor? To make example:

require 'rubygems'
require 'cool.io'

ADDR = '127.0.0.1'
PORT = 4321

cool.io.connection :echo_server_connection do
  on_connect do
    sleep 1
    puts "#{remote_addr}:#{remote_port} connected"
  end
end

cool.io.server ADDR, PORT, :echo_server_connection
cool.io.run

I want this to allow accepting another connection before sleep is over. Any suggestions?

[Tony Arcieri]

You can spin off long running tasks in separate threads. To unblock the event loop, you can use an AsyncWatcher:

https://github.com/tarcieri/cool.io/blob/master/lib/cool.io/async_watcher.rb

[Ilya Grigorik]

+1 for deferrable mixin.. So much of existing EM code relies on deferrables that not having it in cool.io makes transition pretty painful.

[Tony Arcieri]

Let me revisit this...

[David Turnbull]

I just moved https://github.com/dturnbull/ruby-redis to cool.io. I pulled in EM::Deferrable but I think its interface is wonky and the timer won't work so I have a new one designed that I'll be writing up this week.