Configure Orchestra on initialization.

railties/lib/rails/application.rb

@@ -487,5 +487,16 @@ module Rails
         Rails::Generators.options.deep_merge! config.generators.options
       end
     end
+
+    # For each framework, search for instrument file with Orchestra hooks.
+    #
+    initializer :load_orchestra_instrumentation do
+      config.frameworks.each do |framework|
+        begin
+          require "#{framework}/instrument"
+        rescue LoadError => e
+        end
+      end
+    end
   end
 end

railties/lib/rails/configuration.rb

@@ -290,6 +290,14 @@ module Rails
       end
     end
 
+    # Allows Orchestra queue to be modified.
+    #
+    #   config.orchestra.queue = MyNewQueue.new
+    #
+    def orchestra
+      ActiveSupport::Orchestra
+    end
+
     class Generators #:nodoc:
       attr_accessor :aliases, :options, :colorize_logging
 

railties/test/application/orchestra_test.rb

@@ -0,0 +1,49 @@
+require "isolation/abstract_unit"
+require "active_support/orchestra"
+
+module ApplicationTests
+  class OrchestraTest < Test::Unit::TestCase
+
+    class MyQueue
+      attr_reader :events, :subscribers
+
+      def initialize
+        @events = []
+        @subscribers = []
+      end
+
+      def publish(name, payload=nil)
+        @events << name
+      end
+
+      def subscribe(pattern=nil, &block)
+        @subscribers << pattern
+      end
+    end
+
+    def setup
+      build_app
+      boot_rails
+
+      Rails::Initializer.run do |c|
+        c.orchestra.queue = MyQueue.new
+        c.orchestra.subscribe(/listening/) do
+          puts "Cool"
+        end
+      end
+    end
+
+    test "new queue is set" do
+      ActiveSupport::Orchestra.instrument(:foo)
+      assert_equal :foo, ActiveSupport::Orchestra.queue.events.first
+    end
+
+    test "frameworks subscribers are loaded" do
+      assert_equal 1, ActiveSupport::Orchestra.queue.subscribers.count { |s| s == "sql" }
+    end
+
+    test "configuration subscribers are loaded" do
+      assert_equal 1, ActiveSupport::Orchestra.queue.subscribers.count { |s| s == /listening/ }
+    end
+  end
+end