ezmobius / nats

A simple and performant EventMachine based Publish-Subscribe system.

NATS

EventMachine based Publish-Subscribe Messaging that just works.

Supported Platforms

This gem currently works on the following Ruby platforms:

• MRI 1.8 and 1.9 (Performance is best on 1.9.2)
• Rubinius
• JRuby (not quite yet)

Getting Started

rake geminstall
cd ./examples
pub foo 'Hello World!'

Usage

require "nats/client"

NATS.start do

  # Simple Subscriber
  NATS.subscribe('foo') { |msg| puts "Msg received : '#{msg}'" }

  # Simple Publisher
  NATS.publish('foo.bar.baz', 'Hello World!')

  # Publish with closure, callback fires when server has processed the message
  NATS.publish('foo', 'You done?') { puts 'msg processed!' }
  
  # Unsubscribing
  s = NATS.subscribe('bar') { |msg| puts "Msg received : '#{msg}'" }
  NATS.unsubscribe(s)

  # Request/Response

  # The helper
  NATS.subscribe('help') do |msg, reply|
    NATS.publish(reply, "I'll help!")
  end

  # Help request
  NATS.request('help') { |response|
    puts "Got a response: '#{response}'"
  }

  # Wildcard Subscriptions

  # '*" matches any token
  NATS.subscribe('foo.*.baz') { |msg, _, sub| puts "Msg received on [#{sub}] : '#{msg}'" }

  # '>" can only be last token, and matches to any depth
  NATS.subscribe('foo.>') { |msg, _, sub| puts "Msg received on [#{sub}] : '#{msg}'" }


  # Stop using NATS.stop, exits EM loop if NATS.start started it
  NATS.stop

end

See examples and benchmark for more..

License

(The MIT License)

Copyright (c) 2010 Derek Collison

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.