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module Innate
module Helper
# Provides before/after wrappers for actions
#
# This helper is essential for proper working of {Action#render}.
module Aspect
AOP = Hash.new{|h,k| h[k] = Hash.new{|hh,kk| hh[kk] = {} }}
def self.included(into)
into.extend(SingletonMethods)
into.add_action_wrapper(5.0, :aspect_wrap)
end
# Consider objects that have Aspect included
def self.ancestral_aop(from)
aop = {}
from.ancestors.reverse.map{|anc| aop.merge!(AOP[anc]) if anc < Aspect }
aop
end
def aspect_call(position, name)
return unless aop = Aspect.ancestral_aop(self.class)
return unless block = at_position = aop[position]
block = at_position[name.to_sym] unless at_position.is_a?(Proc)
instance_eval(&block) if block
end
def aspect_wrap(action)
return yield unless method = action.name
aspect_call(:before_all, method)
aspect_call(:before, method)
result = yield
aspect_call(:after, method)
aspect_call(:after_all, method)
result
end
# This awesome piece of hackery implements action AOP.
#
# The so-called aspects are simply methods that may yield the next aspect
# in the chain, this is similar to racks concept of middleware, but instead
# of initializing with an app we simply pass a block that may be yielded
# with the action being processed.
#
# This gives us things like logging, caching, aspects, authentication, etc.
#
# Add the name of your method to the trait[:wrap] to add your own method to
# the wrap_action_call chain.
#
# @example adding your method
#
# class MyNode
# Innate.node '/'
#
# private
#
# def wrap_logging(action)
# Innate::Log.info("Executing #{action.name}")
# yield
# end
#
# trait[:wrap]
# end
#
#
# methods may register
# themself in the trait[:wrap] and will be called in left-to-right order,
# each being passed the action instance and a block that they have to yield
# to continue the chain.
#
# @param [Action] action instance that is being passed to every registered method
# @param [Proc] block contains the instructions to call the action method if any
#
# @see Action#render
# @author manveru
def wrap_action_call(action, &block)
return yield if action.options[:is_layout]
wrap = SortedSet.new
action.node.ancestral_trait_values(:wrap).each{|sset| wrap.merge(sset) }
head, *tail = wrap.map{|k,v| v }
tail.reverse!
combined = tail.inject(block){|s,v| lambda{ __send__(v, action, &s) } }
__send__(head, action, &combined)
end
module SingletonMethods
include Traited
def before_all(&block)
AOP[self][:before_all] = block
end
def before(*names, &block)
names.each{|name| AOP[self][:before][name] = block }
end
def after_all(&block)
AOP[self][:after_all] = block
end
def after(*names, &block)
names.each{|name| AOP[self][:after][name] = block }
end
def wrap(*names, &block)
before(*names, &block)
after(*names, &block)
end
def add_action_wrapper(order, method_name)
if wrap = trait[:wrap]
wrap.merge(SortedSet[[order, method_name.to_s]])
else
trait :wrap => SortedSet[[order, method_name.to_s]]
end
end
end
end
end
end
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