Class: MotionWiretap::WiretapArray

Inherits:
Wiretap
  • Object
show all
Defined in:
lib/motion-wiretap/all/wiretap.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Wiretap

#and_then, #cancel!, #combine, #dealloc, #enqueue, #filter, #listen, #map, #on_error, #queue, #reduce, #trigger_changed_on, #trigger_completed, #trigger_completed_on, #trigger_error, #trigger_error_on

Constructor Details

#initialize(targets, &block) ⇒ WiretapArray

Returns a new instance of WiretapArray.



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# File 'lib/motion-wiretap/all/wiretap.rb', line 256

def initialize(targets, &block)
  raise "Not only is listening to an empty array pointless, it will also cause errors" if targets.length == 0

  # the complete trigger isn't called until all the wiretap are complete
  @uncompleted = targets.length

  # targets can be an array of Wiretap objects (they will be monitored), or
  # plain objects (they'll just be included in the sequence)
  super(&block)

  # gets assigned to the wiretap value if it's a Wiretap, or the object
  # itself if it is anything else.
  @values = []
  @initial_is_set = true
  # maps the wiretap object (which is unique)
  @wiretaps = {}

  targets.each_with_index do |wiretap, index|
    unless wiretap.is_a? Wiretap
      @values << wiretap
      # not a wiretap, so doesn't need to be "completed"
      @uncompleted -= 1
    else
      raise "You cannot store a Wiretap twice in the same sequence (for now - do you really need this?)" if @wiretaps.key?(wiretap)
      @wiretaps[wiretap] = index

      @values << wiretap.value

      wiretap.listen do |value|
        indx = @wiretaps[wiretap]
        @values[index] = wiretap.value
        trigger_changed(*@values)
      end

      wiretap.on_error do |error|
        trigger_error(error)
      end

      wiretap.and_then do |error|
        @uncompleted -= 1
        if @uncompleted == 0
          trigger_completed
        end
      end
    end
  end
end

Instance Attribute Details

#targets ⇒ Object (readonly)

Returns the value of attribute targets.



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# File 'lib/motion-wiretap/all/wiretap.rb', line 254

def targets
  @targets
end

Instance Method Details

#teardown ⇒ Object 



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# File 'lib/motion-wiretap/all/wiretap.rb', line 304

def teardown
  cancel = (->(wiretap){ wiretap.cancel! }).weak!
  @wiretaps.keys.each &cancel
  super
end

#trigger_changed(*values) ⇒ Object 



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# File 'lib/motion-wiretap/all/wiretap.rb', line 310

def trigger_changed(*values)
  values = @values if values.length == 0
  super(*values)
end