Module: Cacheable::ClassMethods

Defined in:
lib/steam/community/cacheable.rb

Overview

This module implements functionality to access the cache of a class that includes the Cacheable module as class methods

Author:

  • Sebastian Staudt

Instance Method Summary collapse

Instance Method Details

#cacheable_with_ids(*ids) ⇒ Object

Note:

A call to this method is needed if you want a class including this module to really use the cache.

Defines wich instance variables which should be used to index the cached objects

Parameters:

  • ids (Array<Symbol, Array<Symbol>>) —

    The symbolic names of the instance variables representing a unique identifier for this object class. Arrays of symbols are also allowed and are used as compound IDs.



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# File 'lib/steam/community/cacheable.rb', line 66

def cacheable_with_ids(*ids)
  class_variable_set :@@cache_ids, ids
end

#cached?(id) ⇒ Boolean

Returns whether an object with the given ID is already cached

Parameters:

  • id (Object) —

    The ID of the desired object

Returns:

  • (Boolean) —

    ‘true` if the object with the given ID is already cached



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# File 'lib/steam/community/cacheable.rb', line 75

def cached?(id)
  id.downcase! if id.is_a? String
  cache.key?(id)
end

#clear_cache ⇒ Object

Clears the object cache for the class this method is called on



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# File 'lib/steam/community/cacheable.rb', line 81

def clear_cache
  class_variable_set :@@cache, {}
end

#new(*args) ⇒ Object

This checks the cache for an existing object. If it exists it is returned, otherwise a new object is created. Overrides the default ‘new` method of the cacheable object class.

Parameters:

  • args (Array<Object>) —

    The parameters of the object that should be created and if possible loaded from cache

See Also:



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# File 'lib/steam/community/cacheable.rb', line 93

def new(*args)
  arity = self.instance_method(:initialize).arity.abs
  args += [nil] * (arity - args.size) if args.size < arity
  bypass_cache = args.size > arity + 1 ? !!args.pop : false
  fetch = args.size > arity ? !!args.pop : true

  object = self.allocate
  object.send :initialize, *args
  cached_object = object.send :cached_instance
  object = cached_object unless cached_object.nil? || bypass_cache

  if fetch && (bypass_cache || !object.fetched?)
    object.fetch
    object.cache
  end

  object
end