Notes on rails 2.2 internals.txt

lib/action_controller/dispatcher.rb
	dispatch method
		calls handle_request
                     calls Routing::Routes#recognize(request) to figure out the correct 'controller'
                     once the controller has been identified, calls controller.process
		if an exception gets thrown, do failsafe_rescue(exception)
	failsafe_rescue 
		calls ApplicationController or ActionController::Base's process_with_exception (for Base, it's defined in rescue.rb)

lib/action_controller/rescue.rb
	rescues from exceptions (monkey-patches perform_action of ActionController::Base)
	rescue_responses
		a hash which maps exceptions => status codes; status_codes are either numbers or symbols
	process_with_exception
		call controller's process with :rescue_action as the callback method
	rescue_action
		rescue_action_with_handler || rescue_action_without_handler
        rescue_action_without_handler
                rescue_action_locally || rescue_action_in_public

lib/action_controller/rescuable.rb
        mixed into ActionController::Base in rescue.rb
        rescue_action_with_handler
                handle certain exceptions using the callbacks which the user might have assigned via :rescue_from in his/her controllers.

lib/action_controller/benchmarking.rb
	monkey-patches perform_action also. this is what prints out all the statistics to the console (when using Mongrel via ./script/server)

lib/action_controller/base.rb
	hold the :request, :response, :session, :headers, :action_name attributes
	process
		calls new.process(request, response, method = :perform_action, *arguments)
	perform_action
	        invoke action
		if action not known, raise UnkownAction exception

lib/action_controller/status_codes.rb (mixed into ActionController:Base)
	STATUS_CODES
		hash mapping numeric status-codes => string status text (eg: "200" => "OK")
	interpret_status(status)
		return the header['Status'] given the status code
		arg `status` can be either :symbol or number
		if :symbol, see if it matches any status text from STATUS_CODES text, and then pick that status