Implementation

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Implementation

Class: Subscription.

Constants
PUBLISHABLE, private
A Set containing publishable type identifiers.
SUBSCRIBABLE, private
A Set containing subscribable type identifiers.
Attributes
Methods
Subscription.subscribable()
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  def Subscription.subscribable()
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    return SUBSCRIBABLE
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  end
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Gets SUBSCRIBABLE. Returns SUBSCRIBABLE's reference.
Subscription.publishable()
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  def Subscription.publishable()
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    return PUBLISHABLE
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  end
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Gets PUBLISHABLE. Returns PUBLISHABLE's reference.
Subscription.s_instance(subscriber = nil)
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  def Subscription.s_instance(subscriber = nil)
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    subscriber_c = subscriber.class()
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    return (subscribable().include?(subscriber_c))
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  end
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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)
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  def Subscription.publisher(published = nil)
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    p_class = published.class()
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    return (publishable().include?(p_class))
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  end
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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)
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  def Subscription.update(subject = nil)
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​
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    k_s_i          = kind_subscription(subject)
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    kind_singleton = k_s_i.instance()
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    kind_singleton.update_subscribers(subject)
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    return nil
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​
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  end
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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
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  def Subscription.kind_subscription(published = nil)
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​
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    unless (publisher(published))
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      raise(ArgumentError, "#{published} is not a subscribable instance.")
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    else
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      case
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      when published.instance_of?(Node)
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        return NodeSubscription
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      end
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    end
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​
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  end
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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