Glrb2010 auvi

Introduction to Distributed Programming: The Ruby Way

Auvi [email protected]

Mutually Human Software, LLC

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[bash-10.4 ~]$ ruby talk.rb

Saturday, April 17, 2010

mailto:[email protected]

mailto:[email protected]

[bash-10.4 ~]$ who am I

• Mechanical/Industrial Engineer by training

• Software developer by trade

• Human as a person

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[bash-10.4 ~]$ who am I


[bash-10.4 ~]$ whois mutuallyhuman.com

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“Mutually Human Software is a custom software strategy and design consultancy specializing in mobile & web-based products and services.”


[bash-10.4 ~]$ cat .relevant_history

• Parallel Fluid dynamics simulation (C++/MPI)

• Distributed Analog Computing

• Distributed control systems (Robotics)

• Distributed Discrete-Event Simulation

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[bash-10.4 ~]$ atq

• Distributed programming and Ruby

• DRb

• Rinda

• Others

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[bash-10.4 ~]$ whatis ‘distributed programming’

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“Distributed programming is like network programming—only the audience is different.”

- Lucas Carlson (Ruby Cookbook)


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[bash-10.4 ~]$ ri ‘distributed programming’

DRb Rinda rubyPVM MPI Ruby Starfish

SkyNet MRToolkit

Distribunaut

Politics

BackgrounDRbRabbitMQ

Starling

Delayed Job

MagLev

Erlectricity


[bash-10.4 ~]$ cd DRb

• Distributed Ruby

• Also known as dRuby

• Part of the standard library

• 100% Ruby

• Easy to use

• Universally available where Ruby is installed

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2-tier architecture

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Server Client


Example method

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def humanize(name) "#{name.capitalize} Human"end

humanize('auvi') # => "Auvi Human"


server.rb

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require 'drb'

class HumanServer def humanize(name) "#{name.capitalize} Human" endend

DRb.start_service("druby://127.0.0.1:48626", HumanServer.new)DRb.thread.join


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DRb.start_service("druby://127.0.0.1:48626", HumanServer.new)

Front object

Protocol IP address Port


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[bash-10.4 ~]$ ruby server.rb

Server


client.rb

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require 'drb'

server = DRbObject.new_with_uri("druby://127.0.0.1:48626")

puts server.humanize('auvi')


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Server Client

[bash-10.4 ~]$ ruby client.rb

Auvi Human[bash-10.4 ~]$


server2.rb

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require 'drb'

class Person attr_accessor :name def initialize(name) @name = name end

def humanize "#{@name.capitalize} Human" endend

class HumanServer def personify(name) Person.new(name) endend



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[bash-10.4 ~]$ ruby server2.rb

Server


client2.rb

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require 'drb'

server = DRbObject.new_with_uri("druby://127.0.0.1:48626")p server

person = server.personify('auvi')p person

puts person.humanize


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[bash-10.4 ~]$ ruby client2.rb

#<DRb::DRbObject:0x959c @ref=nil, @uri="druby://127.0.0.1:48626">#<DRb::DRbUnknown:0x1dc66c @name="Person", @buf="\004\bo:\vPerson\006:\n@name\"\tAuvi">client2.rb:9: undefined method `humanize' for #<DRb::DRbUnknown:0x1dc66c> (NoMethodError)

[bash-10.4 ~]$


Solution?

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include DRbUndumped


server3.rb

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require 'drb'

class Person include DRbUndumped attr_accessor :name def initialize(name) @name = name end

def humanize "#{@name.capitalize} Human" endend

class HumanServer def personify(name) Person.new(name) endend



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[bash-10.4 ~]$ ruby server3.rb

Server


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[bash-10.4 ~]$ ruby client2.rb#<DRb::DRbObject:0x959c @ref=nil, @uri="druby://127.0.0.1:48626">#<DRb::DRbObject:0x1dc734 @ref=974550, @uri="druby://127.0.0.1:48626">Auvi Human[bash-10.4 ~]$


Pass by value24


Pass by Reference25


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[bash-10.4 ~]$ cd Rinda

• Implements the Linda distributed computing paradigm

• Also part of the standard library

• 100% Ruby

• Universally available where Ruby is installed


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3-tier architecture

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Service Client

RingServer


A Ring Server?

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ringserver.rb

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require 'rinda/ring'require 'rinda/tuplespace'

DRb.start_serviceRinda::RingServer.new(Rinda::TupleSpace.new)DRb.thread.join


What is a TupleSpace?

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3213

[bash-10.4 ~]$ ruby ringserver.rb

RingServer

Default port : 7647


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service.rb

require 'rinda/ring'

class HumanServer include DRbUndumped

def humanize(name) "#{name.capitalize} Human" endend

DRb.start_service

server = Rinda::RingFinger.primary

server.write([ :human_service, :HumanServer, HumanServer.new, 'Human Server'], Rinda::SimpleRenewer.new)

DRb.thread.join


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Rinda::RingFinger.primary


Format of a Tuple

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[:human_service, :HumanServer, HumanServer.new, 'Human Server']


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373213

[bash-10.4 ~]$ ruby service.rb

Service

RingServer


client.rb

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require 'rinda/ring'

DRb.start_serviceserver = Rinda::RingFinger.primary

service = server.read([:human_service, nil, nil, nil])[2]

puts service.humanize('auvi')


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service = server.read([:human_service, nil, nil, nil])[2]

0 21 3

#<DRb::DRbObject>


[bash-10.4 ~]$ ruby client.rbAuvi Human[bash-10.4 ~]$

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Service Client

RingServer

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4

3


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千里之行，始于足下“A journey of a thousand miles begins with a single step”


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[bash-10.4 ~]$ cat distributed_programming.txt | grep ruby | less

DRb Rinda rubyPVM MPI Ruby Starfish

SkyNet MRToolkit

Distribunaut

Politics

BackgrounDRbRabbitMQ

Starling

Delayed Job

MagLev

Erlectricity


[bash-10.4 ~]$ exit

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logout[Process completed]


Questions?

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Documents

Glrb2010 auvi