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module ActionWebService # :nodoc:
module Container # :nodoc:
module Delegated # :nodoc:
class ContainerError < ActionWebServiceError # :nodoc:
end
def self.append_features(base) # :nodoc:
super
base.extend(ClassMethods)
base.send(:include, ActionWebService::Container::Delegated::InstanceMethods)
end
module ClassMethods
# Declares a web service that will provides access to the API of the given
# +object+. +object+ must be an ActionWebService::Base derivative.
#
# Web service object creation can either be _immediate_, where the object
# instance is given at class definition time, or _deferred_, where
# object instantiation is delayed until request time.
#
# ==== Immediate web service object example
#
# class ApiController < ApplicationController
# web_service_dispatching_mode :delegated
#
# web_service :person, PersonService.new
# end
#
# For deferred instantiation, a block should be given instead of an
# object instance. This block will be executed in controller instance
# context, so it can rely on controller instance variables being present.
#
# ==== Deferred web service object example
#
# class ApiController < ApplicationController
# web_service_dispatching_mode :delegated
#
# web_service(:person) { PersonService.new(request.env) }
# end
def web_service(name, object=nil, &block)
if (object && block_given?) || (object.nil? && block.nil?)
raise(ContainerError, "either service, or a block must be given")
end
name = name.to_sym
if block_given?
info = { name => { :block => block } }
else
info = { name => { :object => object } }
end
write_inheritable_hash("web_services", info)
call_web_service_definition_callbacks(self, name, info)
end
# Whether this service contains a service with the given +name+
def has_web_service?(name)
web_services.has_key?(name.to_sym)
end
def web_services # :nodoc:
read_inheritable_attribute("web_services") || {}
end
def add_web_service_definition_callback(&block) # :nodoc:
write_inheritable_array("web_service_definition_callbacks", [block])
end
private
def call_web_service_definition_callbacks(container_class, web_service_name, service_info)
(read_inheritable_attribute("web_service_definition_callbacks") || []).each do |block|
block.call(container_class, web_service_name, service_info)
end
end
end
module InstanceMethods # :nodoc:
def web_service_object(web_service_name)
info = self.class.web_services[web_service_name.to_sym]
unless info
raise(ContainerError, "no such web service '#{web_service_name}'")
end
service = info[:block]
service ? self.instance_eval(&service) : info[:object]
end
end
end
end
end
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