Contents

# frozen_string_literal: true

require 'dry/effects/effect'

module Dry
  module Effects
    module Effects
      class Cache < ::Module
        class CacheEffect < Effect
          option :scope
        end

        def initialize(scope, shared: false)
          if scope.is_a?(::Hash)
            scope, as = scope.to_a[0]
          else
            as = :cache
          end

          fetch_or_store = CacheEffect.new(
            type: :cache,
            name: :fetch_or_store,
            scope: scope
          )

          if shared
            key = method(:shared_cache_key)
          else
            key = method(:cache_key)
          end

          methods = Array(as)

          module_eval do
            methods.each do |meth|
              define_method(meth) do |*args, &block|
                if block
                  eff = fetch_or_store.(key.(self, args), block)
                else
                  eff = fetch_or_store.(key.(self, args, method: meth), -> { super(*args) })
                end

                ::Dry::Effects.yield(eff)
              end
            end
          end
        end

        def shared_cache_key(_, args, method: Undefined)
          if Undefined.equal?(method)
            args
          else
            [method, args]
          end
        end

        def cache_key(instance, args, method: Undefined)
          if Undefined.equal?(method)
            [instance, args]
          else
            [instance, method, args]
          end
        end
      end
    end
  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
dry-effects-0.1.1	lib/dry/effects/effects/cache.rb
dry-effects-0.1.0	lib/dry/effects/effects/cache.rb
dry-effects-0.1.0.alpha2	lib/dry/effects/effects/cache.rb
dry-effects-0.1.0.alpha	lib/dry/effects/effects/cache.rb