RingyDingy 1.1.0 Released

drbrain | Tue, 24 Oct 2006 15:59:00 GMT

RingyDingy version 1.1.0 has been released!

http://seattlerb.rubyforge.org/RingyDingy

RingyDingy automatically re-registers your DRb service with a RingServer should
communication with the RingServer stop.

Changes:

  • Added ring_server executable (Rinda::RingServer wrapper)

    • Daemon mode
    • Rinda::RingServer service listingph
    • Remote verbose mode enable-disable
  • Switched to Hoe

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RingyDingy-1.0.0

drbrain | Sat, 09 Sep 2006 23:29:00 GMT

RingyDingy is a little boat that keeps your DRb service afloat!

RingyDingy automatically registers a service with a RingServer. If communication between the RingServer and the RingyDingy is lost, RingyDingy will re-register its service with the RingServer when it reappears.

Similarly, the RingServer will automatically drop registrations by a RingyDingy that it can't communicate with after a short timeout.

Installing RingyDingy

Just install the gem: gem install RingyDingy

Using RingyDingy

You'll need a Rinda::RingServer, you can download one here.

Once you've got that running you can have a service register itself: 

require 'rubygems'
require 'ringy_dingy'
require 'my_drb_service'

my_drb_service = MyDRbService.new

RingyDingy.new(my_drb_service).run

DRb.thread.join
Full documentation is available from ri once you've installed the gem.

To learn more about Rinda::RingServer, you can read my handy tutorial How to use Ruby's Rinda::Ring.

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Finding primes with Rinda::TupleSpace

drbrain | Sat, 19 Aug 2006 09:09:00 GMT

While at FOSCON 2006 I watched Lucas Carlson's presentation on Rinda and DRb, but he barely scratched the surface of Rinda's capabilities with his prime finding implementation.

Rinda::TupleSpace is more powerful than just a name service for DRb. Since a TupleSpace has synchronized access to all its items, you can use a TupleSpace to coordinate processes as well.

I started rewriting Lucas' DRb using prime finder at FOSCON, but wasn't able to finish it until now. This version coordinates all the activities of the prime finding via the TupleSpace. No locking is necessary in any of the code because the TupleSpace takes care of it for us. Read more...

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DRb via YAML

drbrain | Sun, 30 Apr 2006 10:01:19 GMT

Much longer than it should be as the serialization of objects is buried inside a couple of huge methods. One tricky bit was having to mark DRbObject as not responding to #yaml_initialize, the other was marking a few undumpable classes as undumpable by YAML.

I’ll post it tomorrow when I have more brain.

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TupleSpace Replicator

drbrain | Sun, 30 Apr 2006 02:32:00 GMT

At MindCamp 2.0 I was asked about how you would replicate a TupleSpace. I whipped up the following implementation: 

class Rinda::TupleSpaceReplicator

  attr_accessor :debug

  attr_reader :local_tuplespace, :remote_tuplespace

  def initialize(remote_tuplespace, templates)
    @local_tuplespace = Rinda::TupleSpace.new
    @remote_tuplespace = remote_tuplespace
    @templates = templates

    @debug = false

    @replicators = ThreadGroup.new
  end

  def replicate
    @templates.each do |template|
      %w[write take].each do |type|
        make_replicator type, template
      end
    end
  end

  def make_replicator(event_type, template)
    thread = Thread.start do
      observer = @remote_tuplespace.notify event_type, template
      observer.each do |event, tuple|
        break if event == 'close'
        @local_tuplespace.send event, tuple
        $stderr.puts "master #{event}: #{tuple.inspect}" if @debug
      end
    end

    @replicators.add thread
  end

end

The core of this is the make_replicator method. It replicates tuples of the specified template from the remote tuplespace to the local tuplespace. Read more...

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DRb an Introduction and Overview

drbrain | Sun, 23 Apr 2006 00:57:34 GMT

I just completed my presentation on Distributed Ruby an Introduction and Overview at the Silicon Valley Ruby Conference. Free of charge you can download a PDF of the slides (720k) or the Keynote original (544k, Apple Keynote only).

Now that I have two outlines of more DRb functionality I should seriously consider writing a book on it.

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