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learn-ruby-zeromq's Introduction

Learn ZeroMQ by Example!

A Work in Progress

If you'd like to help write examples, or if you've found an error, please write me, or fork and patch this repo.

About ZeroMQ

ZeroMQ is one of the simplest and most exciting ways to build high performance, concurrent local and network applications. ZeroMQ uses a sockets style API to make powerful message-based programs fun to build.

Be sure to follow the examples in order, as concepts shown in earlier chapters won't be described later on.

Getting Started

  1. Get a functioning ruby, either jruby (recommended) or 1.9.2. I recommend using rvm to manage multiple rubies
  2. If you're using jruby the ffi gem it comes with will work fine. If using 1.9.2 you MUST install the special ffi gem.
  3. Download and install ZeroMQ from the ZeroMQ download page. ./configure && make && make install
  4. gem install ffi ffi-rzmq zmqmachine. Make sure you have the ffi-rzmq gem >= 0.9.0 . All examples have been updated to use the newer API exposed in ffi-rzmq 0.9.0 and later. If your libzmq version >= 3.2.1, Make sure you have the ffi-rzmq gem >= 0.9.7(you can clone git://github.com/chuckremes/ffi-rzmq.git and build from source), otherwise you will get "Function 'zmq_ctx_set_monitor' not found" error message.

Now you're set! Follow the numbered examples in order, where there are no numbers, there is no order.

Thanks Chuck!

Many thanks to Chuck Remes, author of both ffi-rzmq and zmqmachine for providing the ruby community with these gems, and helping answer my questions. None of this, would have been possible without his efforts.

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learn-ruby-zeromq's Issues

Deregistering a writable socket causes an error.

Running the latest ffi-rzmq and zmqmachine the following code:

https://gist.github.com/2b1b44d8ef4fad1a84d8

gives me the error:

/Users/admin/.rvm/gems/jruby-1.5.1/gems/ffi-rzmq-0.5.0/lib/ffi-rzmq/poll.rb:98:in deregister': undefined local variable or methoditems' for #ZMQ::Poller:0x3e5646a5 (NameError)
from /Users/admin/.rvm/gems/jruby-1.5.1/gems/ffi-rzmq-0.5.0/lib/ffi-rzmq/poll.rb:123:in deregister_writable' from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:288:inderegister_writable'
from 003_ZMQMachine/002_a_pub_sub_example.rb:24:in on_writable' from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/sockets/base.rb:181:inresume_write'
from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:385:in poll' from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:385:ineach'
from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:385:in poll' from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:351:inrun_once'
from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:84:in run' from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:80:ininitialize'
from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:80:in new' from /Users/admin/.rvm/gems/jruby-1.5.1/gems/zmqmachine-0.3.1/lib/zm/reactor.rb:80:inrun'
from 003_ZMQMachine/002_a_pub_sub_example.rb:46

Trying to run examples under XP

So far I had no success setting up environment to run your examples under Windows XPSP3 (32bit). I have successfully built zeromq-2.0.10 - with Visual Studio from Windows package and from sources under Cygwin. So, I have zeromq library working and in path.

Here are the Rubies that I tried (since it is indicated that either JRuby or 1.9.2 are adequate, I only tried those):
Ruby 1.9.2-p0 (Rubyinstaller)
JRuby 1.5.2
Ruby 1.9.2-p0 (built from source under Cygwin)

Unfortunately, trying to run example from https://github.com/andrewvc/learn-ruby-zeromq/ fails with a following trace:

Y:\Dev\apps\win\learn-ruby-zeromq\001_Socket_Types>jruby -v
jruby 1.5.2 (ruby 1.8.7 patchlevel 249) (2010-08-20 1c5e29d) (Java HotSpot(TM) Client VM 1.6.0_20) [x86-java]

Y:\Dev\apps\win\learn-ruby-zeromq\001_Socket_Types>gem list

columnize (0.3.1)
ffi (0.6.3)
ffi-rzmq (0.6.0)
rake (0.8.7)
rspec (1.3.0)
ruby-debug (0.10.3)
ruby-debug-base (0.10.3.2)
sources (0.0.1)
zmqmachine (0.3.2)

Y:\Dev\apps\win\learn-ruby-zeromq\001_Socket_Types>jruby 001_push_pull.rb
C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/site_ruby/shared/ffi/ffi.rb:112:in create_invoker': Function 'valloc' not found in [msvcrt] (FFI::NotFoundError) from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/site_ruby/shared/ffi/library.rb:98:inattach_function'
from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/site_ruby/shared/ffi/library.rb:96:in each' from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/site_ruby/shared/ffi/library.rb:96:inattach_function'
from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/gems/1.8/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq/wrapper.rb:11
from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/gems/1.8/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq/wrapper.rb:31:in require' from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:inrequire'
from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/gems/1.8/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq.rb:71
from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/gems/1.8/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq.rb:70:in each' from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/gems/1.8/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq.rb:70 from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/gems/1.8/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq.rb:36:inrequire'
from C:/Documents and Settings/bezrodnykh/.pik/rubies/JRuby-152/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
from 001_push_pull.rb:2

$ ruby -v
ruby 1.9.2dev (2009-07-18 trunk 24186) [i386-cygwin]

$ gem list

ffi (0.6.3)
ffi-rzmq (0.6.0)
rake (0.8.7)
rubygems-update (1.3.7)
zmqmachine (0.3.2)

vb@vb-mac /y/dev/apps/win/learn-ruby-zeromq/001_Socket_Types
$ ruby 001_push_pull.rb
/home/bezrodnykh/.rvm/gems/ruby-1.9.2-preview1/gems/ffi-0.6.3/lib/ffi/library.rb:129:in attach_function': Function 'valloc' not found in [msvcrt.dll] (FFI::NotFoundError) from /home/bezrodnykh/.rvm/gems/ruby-1.9.2-preview1/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq/wrapper.rb:11:inmodule:LibC'
from /home/bezrodnykh/.rvm/gems/ruby-1.9.2-preview1/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq/wrapper.rb:3:in <top (required)>' from /home/bezrodnykh/.rvm/gems/ruby-1.9.2-preview1/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq.rb:71:inrequire'
from /home/bezrodnykh/.rvm/gems/ruby-1.9.2-preview1/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq.rb:71:in block in <top (required)>' from /home/bezrodnykh/.rvm/gems/ruby-1.9.2-preview1/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq.rb:70:ineach'
from /home/bezrodnykh/.rvm/gems/ruby-1.9.2-preview1/gems/ffi-rzmq-0.6.0/lib/ffi-rzmq.rb:70:in <top (required)>' from 001_push_pull.rb:2:inrequire'
from 001_push_pull.rb:2:in `

'

Any advice/suggestion/hint to help me moving forward?

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