53 lines
1.6 KiB
Ruby
53 lines
1.6 KiB
Ruby
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# Used to generate cache keys for any works index page
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# Include in models that can "own" works, eg ...tags/TAGNAME/works or users/LOGIN/works
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module WorksOwner
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def self.included(base)
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base.extend(ClassMethods)
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end
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module ClassMethods
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# expire a bunch of keys without having to look up the objects in the database
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def expire_ids(ids)
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ids.each do |id|
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klass = (self.superclass == Tag) ? 'tag' : self.to_s.underscore
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REDIS_GENERAL.set("#{klass}_#{id}_windex", Time.now.to_i.to_s)
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end
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end
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end
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# Used in works_controller to determine whether to expire the cache for this object's works index page
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# The timestamp should reflect the last update that would cause the list to need refreshing
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# When both a collection and a tag are given, include both in the key and use the tag's timestamp
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def works_index_cache_key(tag=nil)
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key = "works_index_for_#{self.class.name.underscore}_#{self.id}_"
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if tag.present?
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key << "tag_#{tag.id}_#{tag.works_index_timestamp}"
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else
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key << "#{self.works_index_timestamp}"
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end
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key
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end
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# Set the timestamp if it doesn't yet exist
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def works_index_timestamp
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REDIS_GENERAL.get(redis_works_index_key) || update_works_index_timestamp!
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end
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# Should be called wherever works are updated
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# Making the timestamp a stringy integer mostly for ease of testing
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def update_works_index_timestamp!
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t = Time.now.to_i.to_s
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REDIS_GENERAL.set(redis_works_index_key, t)
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return t
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end
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private
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def redis_works_index_key
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klass = self.is_a?(Tag) ? 'tag' : self.class.to_s.underscore
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"#{klass}_#{self.id}_windex"
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end
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end
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