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Contents
# frozen_string_literal: true
module Katalyst
module Tables
module Collection
# Adds stackable reducers to a collection.
# Inspired by ActiveDispatch::MiddlewareStack which unfortunately can't
# be used due to monkey patches from gems such as NewRelic which assume
# it is only used for Rack middleware.
module Reducers
extend ActiveSupport::Concern
included do
class_attribute :reducers, default: Stack.new
end
class_methods do
delegate :use, :insert, to: :reducers
def inherited(subclass)
super
subclass.reducers = reducers.dup
end
end
class Stack # :nodoc:
def initialize
@stack = []
end
def initialize_dup(other)
@stack = other.instance_variable_get(:@stack).dup
end
def use(klass)
@stack << Reducer.new(klass) unless index(klass)
end
def insert(other, klass)
@stack.insert(index(other), Reducer.new(klass))
end
def index(klass)
@stack.index(Reducer.new(klass))
end
def build(&block)
@stack.freeze.reduce(block) do |app, reducer|
reducer.build(app)
end
end
end
class Reducer # :nodoc:
attr_reader :klass
def initialize(klass)
@klass = klass
end
def build(app)
klass.new(app)
end
def ==(other)
klass.name == other.klass.name
end
def inspect
"#<#{self.class.name} #{klass.name}>"
end
end
end
end
end
end
Version data entries
37 entries across 37 versions & 1 rubygems