Nithin Bekal

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Distributed Ruby (DRb)

dRuby is a distributed object environment for Ruby. dRuby and Rinda are part of Ruby stdlib.

  • RMI (remote method invocation) library
  • extends Ruby method calls across the network
  • allows calling object methods from other processes or machines
  • written completely in Ruby

Rinda:

  • shared tuplespace implementation.
  • co-ordination mechanism running on dRuby.
  • implementation of linda co-ordination language in Ruby

Rules for passing objects between client and server:

  • serializable objects are passed by value
  • non-serializable - by reference

Example code

# server.rb
require 'drb/drb'

queue = SizedQueue.new(100)
DRb.start_service('druby://localhost:9999', queue)
DRb.thread.join
# publisher.rb
require 'drb/drb'

DRb.start_service
q = DRbObject.new_with_uri('druby://localhost:9999')

100.times do |n|
  sleep(rand)
  q.push(n)
end
# consumer.rb
require 'drb/drb'

DRb.start_service
q = DRbObject.new_with_uri('druby://localhost:9999')

100.times do |n|
  sleep(rand)
  puts q.pop
end

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