Module: Promiscuous::AMQP::File::Subscriber

Defined in:
lib/promiscuous/amqp/file.rb

Defined Under Namespace

Classes: Metadata

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#lock ⇒ Object

Returns the value of attribute lock.



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# File 'lib/promiscuous/amqp/file.rb', line 21

def lock
  @lock
end

#num_pending ⇒ Object

Returns the value of attribute num_pending.



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# File 'lib/promiscuous/amqp/file.rb', line 21

def num_pending
  @num_pending
end

#prefetch_wait ⇒ Object

Returns the value of attribute prefetch_wait.



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# File 'lib/promiscuous/amqp/file.rb', line 21

def prefetch_wait
  @prefetch_wait
end

Instance Method Details

#disconnect ⇒ Object 



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# File 'lib/promiscuous/amqp/file.rb', line 64

def disconnect
  @stop = true
end

#recover ⇒ Object 



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# File 'lib/promiscuous/amqp/file.rb', line 61

def recover
end

#subscribe(options = {}, &block) ⇒ Object 



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# File 'lib/promiscuous/amqp/file.rb', line 23

def subscribe(options={}, &block)
  file_name, worker_index, num_workers = Promiscuous::Config.subscriber_amqp_url.split(':')

  worker_index = worker_index.to_i
  num_workers = num_workers.to_i

  file = File.open(file_name, 'r')

  @prefetch = Promiscuous::Config.prefetch
  @num_pending = 0
  @lock = Mutex.new
  @prefetch_wait = ConditionVariable.new

  @thread = Thread.new do
    file.each_with_index do |line, i|
      if num_workers > 0
        next if ((i+worker_index) % num_workers) != 0
      end

      return if @stop

      @lock.synchronize do
        @prefetch_wait.wait(@lock) until @num_pending < @prefetch
        @num_pending += 1
      end

      block.call(Metadata.new(self), line.chomp)
    end

    @lock.synchronize do
      @prefetch_wait.wait(@lock) until @num_pending == 0
    end

    # will shutdown the CLI gracefully
    Process.kill("SIGTERM", Process.pid)
  end
end