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module ActionService # :nodoc:
module Container # :nodoc:
class ContainerError < ActionService::ActionServiceError # :nodoc:
end
def self.append_features(base) # :nodoc:
super
base.class_inheritable_option(:service_dispatching_mode, :direct)
base.class_inheritable_option(:service_exception_reporting, true)
base.extend(ClassMethods)
base.send(:include, ActionService::Container::InstanceMethods)
end
module ClassMethods
# Declares a service that will provides access to the API of the given
# service +object+. +object+ must be an ActionService::Base derivative.
#
# 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 service object example
#
# class ApiController < ApplicationController
# service_dispatching_mode :delegated
#
# 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 service object example
#
# class ApiController < ApplicationController
# service_dispatching_mode :delegated
#
# service(:person) { PersonService.new(@request.env) }
# end
def 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("action_services", info)
call_service_definition_callbacks(self, name, info)
end
# Whether this service contains a service with the given +name+
def has_service?(name)
services.has_key?(name.to_sym)
end
def services # :nodoc:
read_inheritable_attribute("action_services") || {}
end
def add_service_definition_callback(&block) # :nodoc:
write_inheritable_array("service_definition_callbacks", [block])
end
private
def call_service_definition_callbacks(container_class, service_name, service_info)
(read_inheritable_attribute("service_definition_callbacks") || []).each do |block|
block.call(container_class, service_name, service_info)
end
end
end
module InstanceMethods # :nodoc:
def service_object(service_name)
info = self.class.services[service_name.to_sym]
unless info
raise(ContainerError, "no such service '#{service_name}'")
end
service = info[:block]
service ? instance_eval(&service) : info[:object]
end
private
def dispatch_service_request(protocol_request)
case service_dispatching_mode
when :direct
dispatch_direct_service_request(protocol_request)
when :delegated
dispatch_delegated_service_request(protocol_request)
else
raise(ContainerError, "unsupported dispatching mode '#{service_dispatching_mode}'")
end
end
def dispatch_direct_service_request(protocol_request)
public_method_name = protocol_request.public_method_name
api = self.class.service_api
method_name = api.api_method_name(public_method_name)
block = nil
expects = nil
if method_name
signature = api.api_methods[method_name]
expects = signature[:expects]
protocol_request.type = Protocol::CheckedMessage
protocol_request.signature = expects
protocol_request.return_signature = signature[:returns]
else
protocol_request.type = Protocol::UncheckedMessage
system_methods = self.class.read_inheritable_attribute('default_system_methods') || {}
protocol = protocol_request.protocol
block = system_methods[protocol.class]
unless block
method_name = api.default_api_method
unless method_name && respond_to?(method_name)
raise(ContainerError, "no such method ##{public_method_name}")
end
end
end
@method_params = protocol_request.unmarshal
@params ||= {}
if expects
(1..@method_params.size).each do |i|
i -= 1
if expects[i].is_a?(Hash)
@params[expects[i].keys.shift.to_s] = @method_params[i]
else
@params["param#{i}"] = @method_params[i]
end
end
end
if respond_to?(:before_action)
@params['action'] = method_name.to_s
return protocol_request.marshal(nil) if before_action == false
end
perform_invoke = lambda do
if block
block.call(public_method_name, self.class, *@method_params)
else
send(method_name)
end
end
try_default = true
result = nil
catch(:try_default) do
result = perform_invoke.call
try_default = false
end
if try_default
method_name = api.default_api_method
if method_name
protocol_request.type = Protocol::UncheckedMessage
else
raise(ContainerError, "no such method ##{public_method_name}")
end
result = perform_invoke.call
end
after_action if respond_to?(:after_action)
protocol_request.marshal(result)
end
def dispatch_delegated_service_request(protocol_request)
service_name = protocol_request.service_name
service = service_object(service_name)
api = service.class.service_api
public_method_name = protocol_request.public_method_name
method_name = api.api_method_name(public_method_name)
invocation = ActionService::Invocation::InvocationRequest.new(
ActionService::Invocation::ConcreteInvocation,
public_method_name,
method_name)
if method_name
protocol_request.type = Protocol::CheckedMessage
signature = api.api_methods[method_name]
protocol_request.signature = signature[:expects]
protocol_request.return_signature = signature[:returns]
invocation.params = protocol_request.unmarshal
else
protocol_request.type = Protocol::UncheckedMessage
invocation.type = ActionService::Invocation::VirtualInvocation
system_methods = self.class.read_inheritable_attribute('default_system_methods') || {}
protocol = protocol_request.protocol
block = system_methods[protocol.class]
if block
invocation.block = block
invocation.block_params << service.class
else
method_name = api.default_api_method
if method_name && service.respond_to?(method_name)
invocation.params = protocol_request.unmarshal
invocation.method_name = method_name.to_sym
else
raise(ContainerError, "no such method /#{service_name}##{public_method_name}")
end
end
end
canceled_reason = nil
canceled_block = lambda{|r| canceled_reason = r}
perform_invoke = lambda do
service.perform_invocation(invocation, &canceled_block)
end
try_default = true
result = nil
catch(:try_default) do
result = perform_invoke.call
try_default = false
end
if try_default
method_name = api.default_api_method
if method_name
protocol_request.type = Protocol::UncheckedMessage
invocation.params = protocol_request.unmarshal
invocation.method_name = method_name.to_sym
invocation.type = ActionService::Invocation::UnpublishedConcreteInvocation
else
raise(ContainerError, "no such method /#{service_name}##{public_method_name}")
end
result = perform_invoke.call
end
protocol_request.marshal(result)
end
end
end
end
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