Class: Cache::Object::MultiGet

Inherits:
Object
  • Object
show all
Defined in:
lib/cache/object/multi_get.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(clazz) ⇒ MultiGet

Returns a new instance of MultiGet.



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# File 'lib/cache/object/multi_get.rb', line 6

def initialize(clazz)
  @clazz = clazz
end

Instance Attribute Details

#clazz ⇒ Object (readonly)

Returns the value of attribute clazz.



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# File 'lib/cache/object/multi_get.rb', line 4

def clazz
  @clazz
end

Instance Method Details

#cached_objects(ids) ⇒ Object 



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# File 'lib/cache/object/multi_get.rb', line 26

def cached_objects(ids)
  keys = object_keys(ids)
  Cache::Object.adapter.read_multi(keys).values
end

#fetch_all(ids) ⇒ Object 



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# File 'lib/cache/object/multi_get.rb', line 10

def fetch_all(ids)
  objs = cached_objects(ids)
  remaining = missed_ids(ids, objs)
  return objs if remaining.empty?
  objs + load_from_db(remaining)
end

#load_from_db(ids) ⇒ Object 



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# File 'lib/cache/object/multi_get.rb', line 17

def load_from_db(ids)
  primary_key = clazz.primary_key.to_sym
  clazz.where(primary_key => ids).to_a.each(&:write_cache!)
end

#missed_ids(ids, fetched_objects) ⇒ Object 



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# File 'lib/cache/object/multi_get.rb', line 31

def missed_ids(ids, fetched_objects)
  ids - fetched_objects.map(&:id)
end

#object_keys(ids) ⇒ Object 



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# File 'lib/cache/object/multi_get.rb', line 22

def object_keys(ids)
  ids.map { |id| Cache::Object::KeyGenerator.key_for_object(clazz.name, id) }
end