Class: Reacto::Operations::Chunk

Inherits:
Object
  • Object
show all
Defined in:
lib/reacto/operations/chunk.rb

Instance Method Summary collapse

Constructor Details

#initialize(func, executor: nil) ⇒ Chunk

Returns a new instance of Chunk.



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# File 'lib/reacto/operations/chunk.rb', line 8

def initialize(func, executor: nil)
  @func = func
  @executor = executor
end

Instance Method Details

#call(tracker) ⇒ Object 



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# File 'lib/reacto/operations/chunk.rb', line 13

def call(tracker)
  @current_key = NO_VALUE
  @current_data = []

  value = ->(v) do
    key = @func.call(v)

    if key == nil || key == :_separator
      flush_current!(tracker)
      return
    end

    if key == :_alone
      flush_current!(tracker)
      tracker.on_value(LabeledTrackable.new(
        key, @executor, &Behaviours.single_value(v)
      ))

      return
    end

    if key.to_s.start_with?('_')
      flush_current!(tracker)
      tracker.on_error(RuntimeError.new(
        'symbols beginning with an underscore are reserved'
      ))
      return
    end

    if @current_key == NO_VALUE || @current_key == key
      @current_key = key
      @current_data << v
      return
    end

    flush_current!(tracker)

    @current_key = key
    @current_data = [v]
  end

  error = ->(e) do
    flush_current!(tracker)
    tracker.on_error(e)
  end

  close = ->() do
    flush_current!(tracker)
    tracker.on_close
  end

  Subscriptions::OperationSubscription.new(
    tracker, value: value, close: close, error: error
  )
end

#flush_current!(tracker) ⇒ Object 



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# File 'lib/reacto/operations/chunk.rb', line 69

def flush_current!(tracker)
  if @current_key != NO_VALUE
    tracker.on_value(LabeledTrackable.new(
      @current_key, @executor, &Behaviours.enumerable(@current_data)
    ))
  end

  @current_key = NO_VALUE
  @current_data = []
end