Class: Qless::Subscriber

Inherits:
Object
  • Object
show all
Defined in:
lib/qless/subscriber.rb

Overview

A class used for subscribing to messages in a thread

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client, channel, options = {}, &message_received_callback) ⇒ Subscriber

Returns a new instance of Subscriber.



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# File 'lib/qless/subscriber.rb', line 14

def initialize(client, channel, options = {}, &message_received_callback)
  @channel = channel
  @message_received_callback = message_received_callback
  @log = options.fetch(:log) { ::Logger.new($stderr) }

  # pub/sub blocks the connection so we must use a different redis
  # connection
  @client_redis   = client.redis
  @listener_redis = client.new_redis_connection

  @my_channel = Qless.generate_jid
end

Instance Attribute Details

#channel ⇒ Object (readonly)

Returns the value of attribute channel.



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# File 'lib/qless/subscriber.rb', line 12

def channel
  @channel
end

#redis ⇒ Object (readonly)

Returns the value of attribute redis.



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# File 'lib/qless/subscriber.rb', line 12

def redis
  @redis
end

Class Method Details

.start(*args, &block) ⇒ Object 



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# File 'lib/qless/subscriber.rb', line 8

def self.start(*args, &block)
  new(*args, &block).tap(&:start)
end

Instance Method Details

#start ⇒ Object

Start a thread listening



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# File 'lib/qless/subscriber.rb', line 28

def start
  queue = ::Queue.new

  @thread = Thread.start do
    @listener_redis.subscribe(@channel, @my_channel) do |on|
      on.subscribe do |channel|
        queue.push(:subscribed) if channel == @channel
      end

      on.message do |channel, message|
        handle_message(channel, message)
      end
    end
  end

  queue.pop
end

#stop ⇒ Object 



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# File 'lib/qless/subscriber.rb', line 46

def stop
  @client_redis.publish(@my_channel, 'disconnect')
  @thread.join
end