Register Lotus::Application subclasses

lib/lotus/application.rb

@@ -33,6 +33,22 @@ def self.inherited(base)
         class_attribute :configuration
         self.configuration = Configuration.new
       end
+
+      synchronize do
+        applications.add(base)
+      end
+    end
+
+    # Registry of Lotus applications in the current Ruby process
+    #
+    # @return [Set] a set of all the registered applications
+    #
+    # @since x.x.x
+    # @api private
+    def self.applications
+      synchronize do
+        @@applications ||= Set.new
+      end
     end
 
     # Configure the application.
@@ -129,6 +145,17 @@ def self.load!(application = self)
       Lotus::Loader.new(application).load!
     end
 
+    # Preload all the registered applications
+    #
+    # @return [void]
+    #
+    # @since x.x.x
+    def self.preload!
+      synchronize do
+        applications.each(&:load!)
+      end
+    end
+
     # Return the configuration for this application
     #
     # @since 0.1.0
@@ -174,5 +201,17 @@ def call(env)
     def middleware
       @middleware ||= configuration.middleware
     end
+
+    private
+
+    # Yields the given block in a critical section
+    #
+    # @since x.x.x
+    # @api private
+    def self.synchronize
+      Mutex.new.synchronize do
+        yield
+      end
+    end
   end
 end

test/application_test.rb

@@ -5,6 +5,10 @@
     @application = CoffeeShop::Application.new
   end
 
+  it 'register subclasses' do
+    Lotus::Application.applications.must_include(CoffeeShop::Application)
+  end
+
   it 'instantiate new configuration object when inherited' do
     backend_app  = Backend::Application.new
     frontend_app = Frontend::Application.new
@@ -21,6 +25,36 @@
     end
   end
 
+  describe '.preload!' do
+    before do
+      Lotus::Application.applications.clear
+
+      module Foo
+        class Application < Lotus::Application
+          def self.load!(application = self)
+            @@loaded = true
+          end
+
+          def self.loaded?
+            @@loaded
+          end
+
+          configure { }
+        end
+      end
+
+      Lotus::Application.preload!
+    end
+
+    after do
+      Object.__send__(:remove_const, :Foo)
+    end
+
+    it 'preloads registered subclasses' do
+      Foo::Application.must_be :loaded?
+    end
+  end
+
   describe '#configuration' do
     it 'returns class configuration' do
       @application.configuration.must_equal @application.class.configuration