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module ActionController
# Dispatches requests to the appropriate controller and takes care of
# reloading the app after each request when Dependencies.load? is true.
class Dispatcher
class << self
def define_dispatcher_callbacks(cache_classes)
unless cache_classes
# Development mode callbacks
before_dispatch :reload_application
after_dispatch :cleanup_application
ActionView::Helpers::AssetTagHelper.cache_asset_timestamps = false
end
if defined?(ActiveRecord)
after_dispatch :checkin_connections
to_prepare(:activerecord_instantiate_observers) { ActiveRecord::Base.instantiate_observers }
end
after_dispatch :flush_logger if Base.logger && Base.logger.respond_to?(:flush)
to_prepare do
I18n.reload!
end
end
# DEPRECATE: Remove CGI support
def dispatch(cgi = nil, session_options = CgiRequest::DEFAULT_SESSION_OPTIONS, output = $stdout)
new(output).dispatch_cgi(cgi, session_options)
end
# Add a preparation callback. Preparation callbacks are run before every
# request in development mode, and before the first request in production
# mode.
#
# An optional identifier may be supplied for the callback. If provided,
# to_prepare may be called again with the same identifier to replace the
# existing callback. Passing an identifier is a suggested practice if the
# code adding a preparation block may be reloaded.
def to_prepare(identifier = nil, &block)
@prepare_dispatch_callbacks ||= ActiveSupport::Callbacks::CallbackChain.new
callback = ActiveSupport::Callbacks::Callback.new(:prepare_dispatch, block, :identifier => identifier)
@prepare_dispatch_callbacks.replace_or_append!(callback)
end
end
cattr_accessor :middleware
self.middleware = MiddlewareStack.new do |middleware|
middlewares = File.join(File.dirname(__FILE__), "middlewares.rb")
middleware.instance_eval(File.read(middlewares))
end
include ActiveSupport::Callbacks
define_callbacks :prepare_dispatch, :before_dispatch, :after_dispatch
# DEPRECATE: Remove arguments, since they are only used by CGI
def initialize(output = $stdout, request = nil, response = nil)
@output = output
@app = @@middleware.build(lambda { |env| self.dup._call(env) })
end
def dispatch
begin
run_callbacks :before_dispatch
Routing::Routes.call(@env)
rescue Exception => exception
if controller ||= (::ApplicationController rescue Base)
controller.call_with_exception(@env, exception).to_a
else
raise exception
end
ensure
run_callbacks :after_dispatch, :enumerator => :reverse_each
end
end
# DEPRECATE: Remove CGI support
def dispatch_cgi(cgi, session_options)
CGIHandler.dispatch_cgi(self, cgi, @output)
end
def call(env)
@app.call(env)
end
def _call(env)
@env = env
dispatch
end
def reload_application
# Run prepare callbacks before every request in development mode
run_callbacks :prepare_dispatch
Routing::Routes.reload
end
# Cleanup the application by clearing out loaded classes so they can
# be reloaded on the next request without restarting the server.
def cleanup_application
ActiveRecord::Base.reset_subclasses if defined?(ActiveRecord)
ActiveSupport::Dependencies.clear
ActiveRecord::Base.clear_reloadable_connections! if defined?(ActiveRecord)
end
def flush_logger
Base.logger.flush
end
def checkin_connections
# Don't return connection (and peform implicit rollback) if this request is a part of integration test
return if @env.key?("rack.test")
ActiveRecord::Base.clear_active_connections!
end
end
end
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