Class: Flic::Blocker

Inherits:
Object
  • Object
show all
Defined in:
lib/flic/blocker.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Blocker

Returns a new instance of Blocker.



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# File 'lib/flic/blocker.rb', line 9

def initialize
  @semaphore = Mutex.new
  @queues = []
  @rejection_value = nil
end

Instance Attribute Details

#rejection_value ⇒ Object (readonly)

Returns the value of attribute rejection_value.



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# File 'lib/flic/blocker.rb', line 7

def rejection_value
  @rejection_value
end

Instance Method Details

#block_until_callback ⇒ Object 



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# File 'lib/flic/blocker.rb', line 15

def block_until_callback
  queue = Queue.new

  begin
    @semaphore.synchronize do
      if @queues.frozen?
        raise *rejection_value
      else
        @queues << queue
      end
    end

    yield proc { |value| queue << [:resolve, value] }

    control, value = queue.pop

    case control
      when :resolve
        value
      when :reject
        raise *rejection_value
    end
  ensure
    @semaphore.synchronize do
      unless @queues.frozen?
        @queues.delete queue
      end
    end
  end
end

#unblock_all!(*rejection_value) ⇒ Object 



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# File 'lib/flic/blocker.rb', line 46

def unblock_all!(*rejection_value)
  @semaphore.synchronize do
    unless @queues.frozen?
      @rejection_value = rejection_value

      @queues.each { |queue| queue << [:reject, *rejection_value] }.clear
      @queues.freeze

      freeze
    end
  end
end