Class: Meerkat::Backend::Redis

Inherits:
Object
  • Object
show all
Defined in:
lib/meerkat/backend/redis.rb

Instance Method Summary collapse

Constructor Details

#initialize(redis_uri = nil) ⇒ Redis

Returns a new instance of Redis.



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# File 'lib/meerkat/backend/redis.rb', line 6

def initialize(redis_uri = nil)
  @subs = {}
  EM.next_tick do
    @sub = EM::Hiredis.connect redis_uri 
    @pub = EM::Hiredis.connect redis_uri 
    @sub.on :pmessage do |topic, channel, message|
      @subs[topic].each { |cb| cb.call channel, message }
    end
  end
end

Instance Method Details

#publish(topic, json) ⇒ Object 



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# File 'lib/meerkat/backend/redis.rb', line 17

def publish(topic, json)
  @pub.publish topic, json
end

#subscribe(topic, &callback) ⇒ Object 



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# File 'lib/meerkat/backend/redis.rb', line 21

def subscribe(topic, &callback)
  if @subs[topic]
    @subs[topic] << callback
  else
    @subs[topic] = [ callback ]
    EM.next_tick do
      @sub.psubscribe topic 
    end
  end
  [topic, callback]
end

#unsubscribe(sub) ⇒ Object 



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# File 'lib/meerkat/backend/redis.rb', line 33

def unsubscribe(sub)
  topic, cb = sub
  @subs[topic].delete cb
  if @subs[topic].empty?
    EM.next_tick do
      @subs.delete topic 
      @sub.punsubscribe(topic) 
    end
  end
end