# File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 8
 8:       def define_dispatcher_callbacks(cache_classes)
 9:         unless cache_classes
10:           # Development mode callbacks
11:           before_dispatch :reload_application
12:           after_dispatch :cleanup_application
13:         end
14: 
15:         # Common callbacks
16:         to_prepare :load_application_controller do
17:           begin
18:             require_dependency 'application' unless defined?(::ApplicationController)
19:           rescue LoadError => error
20:             raise unless error.message =~ /application\.rb/
21:           end
22:         end
23: 
24:         if defined?(ActiveRecord)
25:           after_dispatch :checkin_connections
26:           to_prepare(:activerecord_instantiate_observers) { ActiveRecord::Base.instantiate_observers }
27:         end
28: 
29:         after_dispatch :flush_logger if Base.logger && Base.logger.respond_to?(:flush)
30: 
31:         to_prepare do
32:           I18n.reload!
33:         end
34:       end

    # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 38
38:       def dispatch(cgi = nil, session_options = CgiRequest::DEFAULT_SESSION_OPTIONS, output = $stdout)
39:         new(output).dispatch_cgi(cgi, session_options)
40:       end

    # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 57
57:       def failsafe_response(fallback_output, status, originating_exception = nil)
58:         yield
59:       rescue Exception => exception
60:         begin
61:           log_failsafe_exception(status, originating_exception || exception)
62:           body = failsafe_response_body(status)
63:           fallback_output.write "Status: #{status}\r\nContent-Type: text/html\r\n\r\n#{body}"
64:           nil
65:         rescue Exception => failsafe_error # Logger or IO errors
66:           $stderr.puts "Error during failsafe response: #{failsafe_error}"
67:           $stderr.puts "(originally #{originating_exception})" if originating_exception
68:         end
69:       end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 103
103:     def initialize(output = $stdout, request = nil, response = nil)
104:       @output, @request, @response = output, request, response
105:     end

    # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 50
50:       def to_prepare(identifier = nil, &block)
51:         @prepare_dispatch_callbacks ||= ActiveSupport::Callbacks::CallbackChain.new
52:         callback = ActiveSupport::Callbacks::Callback.new(:prepare_dispatch, block, :identifier => identifier)
53:         @prepare_dispatch_callbacks.replace_or_append!(callback)
54:       end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 138
138:     def call(env)
139:       @request = RackRequest.new(env)
140:       @response = RackResponse.new(@request)
141:       dispatch
142:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 174
174:     def checkin_connections
175:       # Don't return connection (and peform implicit rollback) if this request is a part of integration test
176:       return if test_request?
177:       ActiveRecord::Base.clear_active_connections!
178:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 155
155:     def cleanup_application
156:       ActiveRecord::Base.reset_subclasses if defined?(ActiveRecord)
157:       ActiveSupport::Dependencies.clear
158:       ActiveRecord::Base.clear_reloadable_connections! if defined?(ActiveRecord)
159:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 118
118:     def dispatch
119:       if ActionController::Base.allow_concurrency
120:         dispatch_unlocked
121:       else
122:         @@guard.synchronize do
123:           dispatch_unlocked
124:         end
125:       end
126:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 128
128:     def dispatch_cgi(cgi, session_options)
129:       if cgi ||= self.class.failsafe_response(@output, '400 Bad Request') { CGI.new }
130:         @request = CgiRequest.new(cgi, session_options)
131:         @response = CgiResponse.new(cgi)
132:         dispatch
133:       end
134:     rescue Exception => exception
135:       failsafe_rescue exception
136:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 107
107:     def dispatch_unlocked
108:       begin
109:         run_callbacks :before_dispatch
110:         handle_request
111:       rescue Exception => exception
112:         failsafe_rescue exception
113:       ensure
114:         run_callbacks :after_dispatch, :enumerator => :reverse_each
115:       end
116:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 161
161:     def flush_logger
162:       Base.logger.flush
163:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 165
165:     def mark_as_test_request!
166:       @test_request = true
167:       self
168:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 144
144:     def reload_application
145:       # Run prepare callbacks before every request in development mode
146:       run_callbacks :prepare_dispatch
147: 
148:       Routing::Routes.reload
149:       ActionController::Base.view_paths.reload!
150:       ActionView::Helpers::AssetTagHelper::AssetTag::Cache.clear
151:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 170
170:     def test_request?
171:       @test_request
172:     end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 186
186:       def failsafe_rescue(exception)
187:         self.class.failsafe_response(@output, '500 Internal Server Error', exception) do
188:           if @controller ||= defined?(::ApplicationController) ? ::ApplicationController : Base
189:             @controller.process_with_exception(@request, @response, exception).out(@output)
190:           else
191:             raise exception
192:           end
193:         end
194:       end

     # File vendor/rails/actionpack/lib/action_controller/dispatcher.rb, line 181
181:       def handle_request
182:         @controller = Routing::Routes.recognize(@request)
183:         @controller.process(@request, @response).out(@output)
184:       end