(aca:rooms) add support for defining component settings

Author: kimburgess

modules/aca/rooms/component_manager.rb

@@ -77,13 +77,20 @@ def overlay_module_for(component)
 
     module Mixin
         def components(*components)
+            system_settings = {}
+
             # Load the associated module
             modules = components.map do |component|
-                fqn = "::Aca::Rooms::Components::#{component}"
-                ::Orchestrator::DependencyManager.load fqn, :logic
+                mod, settings = load component
+
+                system_settings.merge! settings do |key, _, _|
+                    raise "setting \"#{key}\" declared in multiple components"
+                end
+
+                mod
             end
 
-            # Include the component
+            # Include the components
             include(*modules)
 
             # Compose cross-component behaviours
@@ -96,6 +103,39 @@ def components(*components)
                 end
             end
             prepend(*overlays.compact)
+
+            default_settings system_settings
+        end
+
+        private
+
+        # Load a component, returning a reference to the Module and the
+        # settings it defines.
+        #
+        # Settings may be defined by using the 'setting' keyword within the
+        # component module. Support for this is temporarily mixed in during
+        # load below.
+        def load(component)
+            fqn = "::Aca::Rooms::Components::#{component}"
+
+            settings = {}
+
+            stub = Module.new do
+                define_singleton_method :setting do |hash|
+                    settings.merge! hash do |key, _, _|
+                        raise "\"#{key}\" declared multiple times in #{fqn}"
+                    end
+                end
+            end
+
+            ::Aca::Rooms::Components.send :remove_const, component
+            ::Aca::Rooms::Components.const_set component, stub
+
+            mod = ::Orchestrator::DependencyManager.load fqn, :logic
+
+            mod.send :undef_method, :setting
+
+            [mod, settings]
         end
     end
 

modules/aca/rooms/components/io.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module Aca::Rooms::Components::Io
+    setting default_routes: {}
+
     def show(source, on: default_outputs)
         source = source.to_sym
         target = Array(on).map(&:to_sym)

modules/aca/rooms/components/power.rb

@@ -1,11 +1,16 @@
 # frozen_string_literal: true
 
 module Aca::Rooms::Components::Power
-    def powerup
+    setting powerup_actions: {}
+
+    setting shutdown_actions: {}
 
+    def powerup
+        logger.debug 'in power mod'
+        :online
     end
 
     def shutdown
-
+        :shutdown
     end
 end