Constants

PUBLISHABLE, private

A Set containing publishable type identifiers.

SUBSCRIBABLE, private

A Set containing subscribable type identifiers.

Attributes

Methods

Subscription.subscribable()

  def Subscription.subscribable()
    return SUBSCRIBABLE
  end

Gets SUBSCRIBABLE. Returns SUBSCRIBABLE's reference.

Subscription.publishable()

  def Subscription.publishable()
    return PUBLISHABLE
  end

Gets PUBLISHABLE. Returns PUBLISHABLE's reference.

Subscription.s_instance(subscriber = nil)

  def Subscription.s_instance(subscriber = nil)
    subscriber_c = subscriber.class()
    return (subscribable().include?(subscriber_c))
  end

Predicate. Verifies an object is a subscribable type's instance. Takes a subscribable instance argument, subscriber. In the case subscriber is a subscribable type's instance, returns true. Returns false otherwise.

Subscription.publisher(published = nil)

  def Subscription.publisher(published = nil)
    p_class = published.class()
    return (publishable().include?(p_class))
  end

Predicate. Verifies a publishable argument is a publishing type instance. Takes a publishable type instance argument, published. Returns true in the case published's class is a publishable class. Returns false otherwise.

Subscription.update(subject = nil)

  def Subscription.update(subject = nil)
​
    k_s_i          = kind_subscription(subject)
    kind_singleton = k_s_i.instance()
    kind_singleton.update_subscribers(subject)
    return nil
​
  end

Updates an Observer subject's subscribers. Takes a subscribable argument, subject. Updates all subject's feed subscribers. Returns nil.

Subscription.kind_subscription(publisher = nil) private

  def Subscription.kind_subscription(published = nil)
​
    unless (publisher(published))
      raise(ArgumentError, "#{published} is not a subscribable instance.")
    else
      case
      when published.instance_of?(Node)
        return NodeSubscription
      end
    end
​
  end

Discerns the appropriate subscription identifier. Takes a publishable argument, publisher. Returns publisher's kind subscription identifier. Raises an ArgumentError in the case the argument is not a publishable object.

Subscription.new() private, undefined