Glrb2010 auvi

[bash-10.4 ~]$ ruby talk.rb

Introduction to Distributed Programming:
The Ruby Way

Auvi Rahman
auvi@mutuallyhuman.com
Mutually Human Software, LLC

1
Saturday, April 17, 2010

[bash-10.4 ~]$ who am I

• Mechanical/Industrial Engineer by training
• Software developer by trade
• Human as a person

2

[bash-10.4 ~]$ whois mutuallyhuman.com

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

3

[bash-10.4 ~]$ cat .relevant_history

• Parallel Fluid dynamics simulation (C++/MPI)
• Distributed Analog Computing
• Distributed control systems (Robotics)
• Distributed Discrete-Event Simulation

4

[bash-10.4 ~]$ atq

• Distributed programming and Ruby
• DRb
• Rinda
• Others

5

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

“Distributed programming is like network
programming—only the audience is different.”
- Lucas Carlson (Ruby Cookbook)

6

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

DRb Rinda rubyPVM MPI Ruby Starﬁsh

SkyNet MRToolkit MagLev Politics Starling

Delayed
RabbitMQ Distribunaut Erlectricity BackgrounDRb
Job

7

[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
8

2-tier architecture

Server Client

9

Example method

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

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

10

server.rb

require 'drb'

class HumanServer
def humanize(name)
end
end

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

11

Protocol IP address Port


Front
object

12

[bash-10.4 ~]$ ruby server.rb

Server

13

client.rb

require 'drb'

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

puts server.humanize('auvi')

14

[bash-10.4 ~]$ ruby client.rb
Auvi Human
[bash-10.4 ~]$

Server Client

15

server2.rb

require 'drb'

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

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

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

DRb.thread.join

16

[bash-10.4 ~]$ ruby server2.rb

Server

17

client2.rb

require 'drb'

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

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

puts person.humanize

18

[bash-10.4 ~]$ ruby client2.rb

#<DRb::DRbObject:0x959c @ref=nil, @uri="druby://127.0.0.1:48626">
#<DRb::DRbUnknown:0x1dc66c @name="Person", @buf="004bo:vPerson006:n@name"tAuvi">
client2.rb:9: undefined method `humanize' for #<DRb::DRbUnknown:0x1dc66c> (NoMethodError)

[bash-10.4 ~]$

19

Solution?

include DRbUndumped

20

server3.rb

require 'drb'

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

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

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

DRb.thread.join

21

[bash-10.4 ~]$ ruby server3.rb

Server

22

[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 ~]$

23

Pass by value
24

Pass by Reference
25

[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

26

3-tier architecture
RingServer

Service Client

27
9

A Ring Server?

28

ringserver.rb

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

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

29

What is a TupleSpace?

30

[bash-10.4 ~]$ ruby ringserver.rb

RingServer

Default port : 7647

13
32

service.rb

class HumanServer
include DRbUndumped

def humanize(name)
end
end

DRb.start_service

server = Rinda::RingFinger.primary

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

DRb.thread.join

33

Rinda::RingFinger.primary

34

Format of a Tuple

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

35

[bash-10.4 ~]$ ruby service.rb

RingServer

Service

13
32
37

client.rb


DRb.start_service
server = Rinda::RingFinger.primary

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

puts service.humanize('auvi')

38

#<DRb::DRbObject>

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

0 1 2 3

39

[bash-10.4 ~]$ ruby client.rb
Auvi Human
[bash-10.4 ~]$

RingServer
1
2

3
Service Client
4

40

“A journey of a thousand miles begins with a single step”

41

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

DRb Rinda rubyPVM MPI Ruby Starﬁsh

SkyNet MRToolkit MagLev Politics Starling

Delayed
RabbitMQ Distribunaut Erlectricity BackgrounDRb
Job

43

[bash-10.4 ~]$ exit

logout
[Process completed]

44

Questions?

45

Glrb2010 auvi

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