subscribe unsubscribe on change but not yet on boot

config/initializers/semantic_logger.rb

@@ -1,22 +1,18 @@
 RailsSemanticLogger::Rack::Logger.logger.level = :info # useful for remaining log like "[Rack::Log] Started..."
 SemanticLogger.clear_appenders!
 
+im = nil
 # Zeitwerk reload message
-Rails.autoloaders.main.on_load('ApplicationController') { SemanticLogger[:Zeitwerk].debug('reload!') }
-
-all_notifications = {
-  action_controller: %i[start_processing process_action redirect_to],
-  action_view: %i[render_partial render_template render_collection render_layout],
-  active_record: %i[sql strict_loading instantiation start_transaction transaction]
-}
+Rails.autoloaders.main.on_load('ApplicationController') do
+  SemanticLogger[:zeitwerk].debug('reload!')
+  im = Semantic::InstrumentationManager.new
+end
 
 Rails.configuration.after_initialize do
-  all_notifications.each do |event_group, hooks|
-    hooks.each { |hook| ActiveSupport::Notifications.unsubscribe("#{hook}.#{event_group}") }
-  end
-
+  Semantic::InstrumentationManager.clear
   ActiveSupport::Notifications.subscribe('rolling.live_constant') do |event|
-    SemanticLogger[:live_notifications].warn('rolling.live_constant', event.payload)
-    # FIXME: to be continued...
+    im.process(event.payload[:changes])
+  rescue StandardError => e
+    puts e
   end
 end

lib/live/definable.rb

@@ -30,6 +30,8 @@ module Live
     def trigger_rolling_event(changes)
       ActiveSupport::Notifications.instrument('rolling.live_constant', changes:)
       FileUtils.touch(MAIN_CSS) if defined?(RailsLiveReload) # triggering RailsLiveReload
+    rescue StandardError => e
+      logger.error(e)
     end
 
     def override(constant, raw)

lib/semantic/fancy_formatter.rb

@@ -131,7 +131,8 @@ module Semantic
     def centerize(text, max_length = CENTER_SIZE) = text.reverse.truncate(max_length).reverse.center(max_length)
 
     def origin
-      taint = log.name.include?('_') ? TEXT_GRAY_400 : TEXT_CYAN
+      true_class = log.name == log.name.upcase_first
+      taint = true_class ? TEXT_CYAN : TEXT_GRAY_400
       colorize(centerize(log.name), taint)
     end
 

lib/semantic/instrumentation_manager.rb

@@ -0,0 +1,68 @@
+module Semantic
+  class InstrumentationManager
+    NOTIFICATIONS = {
+      action_controller: %i[start_processing process_action redirect_to],
+      action_view: %i[render_partial render_template render_collection render_layout],
+      active_record: %i[sql strict_loading instantiation start_transaction transaction]
+    }.freeze
+
+    def logger = @logger ||= SemanticLogger[:instrumentation]
+
+    def initialize
+      logger.debug 're-initialized'
+    end
+
+    def self.clear
+      NOTIFICATIONS.each do |event_group, hooks|
+        hooks.each { |hook| ActiveSupport::Notifications.unsubscribe("#{hook}.#{event_group}") }
+      end
+    end
+
+    def process(changes)
+      logger.info "process called with #{changes.size} change(s)"
+      changes.each do |change|
+        constant = change[:constant]
+        value = change[:new_value]
+        case constant
+        when 'ACTION_VIEW', 'ACTION_CONTROLLER', 'ACTIVE_RECORD'
+          value ? enable(constant) : disable(constant)
+        end
+      end
+      logger.info 'DONE'
+    end
+
+    def enable(constant)
+      logger.info("enable: #{constant}")
+      event_group = constant.underscore.to_sym
+      log_subscriber = build_log_subscriber_from(event_group.to_s.camelize)
+      logger.warn(log_subscriber)
+
+      NOTIFICATIONS[event_group].each do |hook|
+        logger.info("subscribe to #{hook}.#{event_group}")
+        ActiveSupport::Notifications.subscribe("#{hook}.#{event_group}") do |event|
+          # logger.debug("SEND #{log_subscriber} hook=#{hook}")
+          log_subscriber.send(hook, event)
+        end
+      end
+    end
+
+    def disable(constant)
+      logger.info("disable: #{constant}")
+      event_group = constant.underscore.to_sym
+
+      logger.debug(NOTIFICATIONS[event_group].size)
+
+      NOTIFICATIONS[event_group].each do |hook|
+        logger.info("unsubscribe to #{hook}.#{event_group}")
+        ActiveSupport::Notifications.unsubscribe("#{hook}.#{event_group}")
+      end
+    end
+
+    def build_log_subscriber_from(classname)
+      case classname
+      when 'ActionController' then Semantic::Subscribers.const_get(classname).new('toto1')
+      else Semantic::Subscribers.const_get(classname).new
+      end
+    end
+  end
+end

lib/semantic/subscribers/action_controller.rb

@@ -21,9 +21,9 @@ module Semantic
           request = event.payload[:request]
           path = colorize(request.filtered_path, BOLD)
 
-          dimensions = Semantic::AnsiDimensions.new(rails: '╓─╖', before: 1)
+          dimensions = Semantic::FancyDimensions.new(rails: '╓─╖', before: 1)
           if defined?(@previously_redirect) && @previously_redirect
-            dimensions = Semantic::AnsiDimensions.new(rails: '╓║╖', before: 0)
+            dimensions = Semantic::FancyDimensions.new(rails: '╓║╖', before: 0)
             @previously_redirect = false
           end
           logger.info("Started #{request.raw_request_method} #{path}", dimensions:)
@@ -44,7 +44,7 @@ module Semantic
         end
       end
 
-      def finish_processing(event)
+      def process_action(event)
         session_value = @transactions.delete(event.transaction_id) # delete previous session_value from start_processing
         SemanticLogger.tagged(session_value) do
           payload = event.payload
@@ -70,17 +70,17 @@ module Semantic
 
           dimensions = case status_family
                        when 2
-                         Semantic::AnsiDimensions.new(rails: TERMINUS_STRING)
+                         Semantic::FancyDimensions.new(rails: TERMINUS_STRING)
                        when 3
-                         Semantic::AnsiDimensions.new(rails: '╙║╜')
+                         Semantic::FancyDimensions.new(rails: '╙║╜')
                        when 4
-                         Semantic::AnsiDimensions.new(rails: '╙╨╜')
+                         Semantic::FancyDimensions.new(rails: '╙╨╜')
                        when 5
-                         Semantic::AnsiDimensions.new(rails: '╙║╜')
+                         Semantic::FancyDimensions.new(rails: '╙║╜')
                        end
           logger.info("Completed #{colorize(status, BOLD)} #{Rack::Utils::HTTP_STATUS_CODES[status]}", dimensions:)
-          logger.info(' ', dimensions: Semantic::AnsiDimensions.new(rails: ' ║ ')) if status_family == 3
-          logger.info(' ', dimensions: Semantic::AnsiDimensions.new(rails: '╓║╖')) if status_family == 5
+          logger.info(' ', dimensions: Semantic::FancyDimensions.new(rails: ' ║ ')) if status_family == 3
+          logger.info(' ', dimensions: Semantic::FancyDimensions.new(rails: '╓║╖')) if status_family == 5
         end
       end
 

lib/semantic/subscribers/action_view.rb

@@ -9,7 +9,6 @@ module Semantic
 
       def initialize
         super(:action_view)
-        logger.level = Hot::Constants.log_action_view ? :debug : :fatal
       end
 
       def render_partial(event)