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module Qpid::Proton

  # Track the {Transfer::State} of a sent message.
  class Tracker < Transfer
    # @return [Sender] The parent {Sender} link.
    def sender() link; end

    # Re-delivery modifications sent by the receiver in {Delivery#release}
    # @return [Hash] See the {Delivery#release} +opts+ parameter.
    # @return [nil] If no modifications were requested by the receiver.
    def modifications()
      return nil if (state != MODIFIED)
      d = Cproton.pn_delivery_remote(@impl)
      {
       :failed => Cproton.pn_disposition_is_failed(d),
       :undeliverable => Cproton.pn_disposition_is_undeliverable(d),
       :annotations => Codec::Data.to_object(Cproton.pn_disposition_annotations(d))
      }
    end

    # Abort a partially-sent message.
    # The tracker can no longer be used after calling {#abort}.
    def abort()
      Cproton.pn_delivery_abort(@impl)
    end
  end
end