Replace AD::Callbacks.to_prepare with AD::Reloader.to_prepare

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

actionpack/lib/action_dispatch/middleware/callbacks.rb

 module ActionDispatch
   # Provide callbacks to be executed before and after the request dispatch.
-  #
-  # It also provides a to_prepare callback, which is performed in all requests
-  # in development by only once in production and notification callback for async
-  # operations.
-  #
   class Callbacks
     include ActiveSupport::Callbacks
 
     define_callbacks :call, :rescuable => true
-    define_callbacks :prepare, :scope => :name
 
-    # Add a preparation callback. Preparation callbacks are run before every
-    # request in development mode, and before the first request in production mode.
-    #
-    # If a symbol with a block is given, the symbol is used as an identifier.
-    # That allows to_prepare to 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 self.to_prepare(*args, &block)
-      first_arg = args.first
-      if first_arg.is_a?(Symbol) && block_given?
-        remove_method :"__#{first_arg}" if method_defined?(:"__#{first_arg}")
-        define_method :"__#{first_arg}", &block
-        set_callback(:prepare, :"__#{first_arg}")
-      else
-        set_callback(:prepare, *args, &block)
-      end
+      ActiveSupport::Deprecation.warn "ActionDispatch::Callbacks.to_prepare is deprecated. " <<
+        "Please use ActionDispatch::Reloader.to_prepare instead."
+      ActionDispatch::Reloader.to_prepare(*args, &block)
     end
 
     def self.before(*args, &block)
@@ -37,14 +19,13 @@ def self.after(*args, &block)
       set_callback(:call, :after, *args, &block)
     end
 
-    def initialize(app, prepare_each_request = false)
-      @app, @prepare_each_request = app, prepare_each_request
-      _run_prepare_callbacks
+    def initialize(app, unused = nil)
+      ActiveSupport::Deprecation.warn "Passing a second argument to ActionDispatch::Callbacks.new is deprecated." unless unused.nil?
+      @app = app
     end
 
     def call(env)
       _run_call_callbacks do
-        _run_prepare_callbacks if @prepare_each_request
         @app.call(env)
       end
     end

actionpack/test/dispatch/callbacks_test.rb

 require 'abstract_unit'
 
-class DispatcherTest < Test::Unit::TestCase
+class DispatcherTest < ActiveSupport::TestCase
   class Foo
     cattr_accessor :a, :b
   end
@@ -13,65 +13,9 @@ def call(env)
 
   def setup
     Foo.a, Foo.b = 0, 0
-    ActionDispatch::Callbacks.reset_callbacks(:prepare)
     ActionDispatch::Callbacks.reset_callbacks(:call)
   end
 
-  def test_prepare_callbacks_with_cache_classes
-    a = b = c = nil
-    ActionDispatch::Callbacks.to_prepare { |*args| a = b = c = 1 }
-    ActionDispatch::Callbacks.to_prepare { |*args| b = c = 2 }
-    ActionDispatch::Callbacks.to_prepare { |*args| c = 3 }
-
-    # Ensure to_prepare callbacks are not run when defined
-    assert_nil a || b || c
-
-    # Run callbacks
-    dispatch
-
-    assert_equal 1, a
-    assert_equal 2, b
-    assert_equal 3, c
-
-    # Make sure they are only run once
-    a = b = c = nil
-    dispatch
-    assert_nil a || b || c
-  end
-
-  def test_prepare_callbacks_without_cache_classes
-    a = b = c = nil
-    ActionDispatch::Callbacks.to_prepare { |*args| a = b = c = 1 }
-    ActionDispatch::Callbacks.to_prepare { |*args| b = c = 2 }
-    ActionDispatch::Callbacks.to_prepare { |*args| c = 3 }
-
-    # Ensure to_prepare callbacks are not run when defined
-    assert_nil a || b || c
-
-    # Run callbacks
-    dispatch(false)
-
-    assert_equal 1, a
-    assert_equal 2, b
-    assert_equal 3, c
-
-    # Make sure they are run again
-    a = b = c = nil
-    dispatch(false)
-    assert_equal 1, a
-    assert_equal 2, b
-    assert_equal 3, c
-  end
-
-  def test_to_prepare_with_identifier_replaces
-    ActionDispatch::Callbacks.to_prepare(:unique_id) { |*args| Foo.a, Foo.b = 1, 1 }
-    ActionDispatch::Callbacks.to_prepare(:unique_id) { |*args| Foo.a = 2 }
-
-    dispatch
-    assert_equal 2, Foo.a
-    assert_equal 0, Foo.b
-  end
-
   def test_before_and_after_callbacks
     ActionDispatch::Callbacks.before { |*args| Foo.a += 1; Foo.b += 1 }
     ActionDispatch::Callbacks.after  { |*args| Foo.a += 1; Foo.b += 1 }
@@ -85,10 +29,20 @@ def test_before_and_after_callbacks
     assert_equal 4, Foo.b
   end
 
+  def test_to_prepare_deprecation
+    prepared = false
+    assert_deprecated do
+      ActionDispatch::Callbacks.to_prepare { prepared = true }
+    end
+
+    ActionDispatch::Reloader.prepare!
+    assert prepared
+  end
+
   private
 
-    def dispatch(cache_classes = true, &block)
-      @dispatcher ||= ActionDispatch::Callbacks.new(block || DummyApp.new, !cache_classes)
+    def dispatch(&block)
+      @dispatcher ||= ActionDispatch::Callbacks.new(block || DummyApp.new)
       @dispatcher.call({'rack.input' => StringIO.new('')})
     end
 

activerecord/lib/active_record/railtie.rb

@@ -82,7 +82,7 @@ class Railtie < Rails::Railtie
       ActiveSupport.on_load(:active_record) do
         instantiate_observers
 
-        ActionDispatch::Callbacks.to_prepare(:activerecord_instantiate_observers) do
+        ActionDispatch::Reloader.to_prepare(:activerecord_instantiate_observers) do
           ActiveRecord::Base.instantiate_observers
         end
       end

activesupport/lib/active_support/file_update_checker.rb

@@ -8,7 +8,7 @@ module ActiveSupport
   #     I18n.reload!
   #   end
   #
-  #   ActionDispatch::Callbacks.to_prepare do
+  #   ActionDispatch::Reloader.to_prepare do
   #     i18n_reloader.execute_if_updated
   #   end
   #

activesupport/lib/active_support/i18n_railtie.rb

@@ -19,7 +19,7 @@ def self.reloader
     # on to_prepare callbacks. This will only happen on the config.after_initialize
     # callback below.
     initializer "i18n.callbacks" do
-      ActionDispatch::Callbacks.to_prepare do
+      ActionDispatch::Reloader.to_prepare do
         I18n::Railtie.reloader.execute_if_updated
       end
     end

railties/lib/rails/application.rb

@@ -157,7 +157,7 @@ def default_middleware_stack
         middleware.use ::ActionDispatch::RemoteIp, config.action_dispatch.ip_spoofing_check, config.action_dispatch.trusted_proxies
         middleware.use ::Rack::Sendfile, config.action_dispatch.x_sendfile_header
         middleware.use ::ActionDispatch::Reloader unless config.cache_classes
-        middleware.use ::ActionDispatch::Callbacks, !config.cache_classes
+        middleware.use ::ActionDispatch::Callbacks
         middleware.use ::ActionDispatch::Cookies
 
         if config.session_store

railties/lib/rails/application/finisher.rb

@@ -21,7 +21,7 @@ module Finisher
 
       initializer :add_to_prepare_blocks do
         config.to_prepare_blocks.each do |block|
-          ActionDispatch::Callbacks.to_prepare(&block)
+          ActionDispatch::Reloader.to_prepare(&block)
         end
       end
 
@@ -37,6 +37,10 @@ module Finisher
         build_middleware_stack
       end
 
+      initializer :run_prepare_callbacks do
+        ActionDispatch::Reloader.prepare!
+      end
+
       initializer :eager_load! do
         if config.cache_classes && !$rails_rake_task
           ActiveSupport.run_load_hooks(:before_eager_load, self)
@@ -52,7 +56,7 @@ module Finisher
       initializer :set_routes_reloader do |app|
         reloader = lambda { app.routes_reloader.execute_if_updated }
         reloader.call
-        ActionDispatch::Callbacks.to_prepare(&reloader)
+        ActionDispatch::Reloader.to_prepare(&reloader)
       end
 
       # Disable dependency loading during request cycle

railties/lib/rails/console/app.rb

@@ -26,7 +26,6 @@ def new_session
 # reloads the environment
 def reload!(print=true)
   puts "Reloading..." if print
-  # This triggers the to_prepare callbacks
-  ActionDispatch::Callbacks.new(Proc.new {}, false).call({})
+  ActionDispatch::Reloader.reload!
   true
 end

railties/test/application/console_test.rb

@@ -26,14 +26,14 @@ def test_new_session_should_return_integration_session
     assert_instance_of ActionDispatch::Integration::Session, session
   end
 
-  def test_reload_should_fire_preparation_callbacks
+  def test_reload_should_fire_preparation_and_cleanup_callbacks
     load_environment
     a = b = c = nil
 
     # TODO: These should be defined on the initializer
-    ActionDispatch::Callbacks.to_prepare { a = b = c = 1 }
-    ActionDispatch::Callbacks.to_prepare { b = c = 2 }
-    ActionDispatch::Callbacks.to_prepare { c = 3 }
+    ActionDispatch::Reloader.to_prepare { a = b = c = 1 }
+    ActionDispatch::Reloader.to_prepare { b = c = 2 }
+    ActionDispatch::Reloader.to_cleanup { c = 3 }
 
     # Hide Reloading... output
     silence_stream(STDOUT) { reload! }