instrumentalizer OK

config/initializers/instrumentalizing.rb

@@ -15,51 +15,18 @@ def build_instrumentation_config
   end.compact
 end
 
-Rails.autoloaders.main.on_load('ApplicationController') do
-  puts '--- Zeitwerk RELOAD ---'
-  Semantic::Instrumentalizer.activate(*build_instrumentation_config)
-end
-
 Rails.configuration.after_initialize do
-  puts '---- AFTER INITIALIZE ---------'
   Rails.logger.name = 'rails'
 
   ActiveSupport::Notifications.subscribe('rolling.live_constant') do |event|
-    puts event.payload[:changes].inspect
-    # TODO: if key includes ACTIVE_RECORD ACTION_VIEW
-    Semantic::Instrumentalizer.activate(*build_instrumentation_config)
+    constants = event.payload[:changes].map { |change| change[:constant] }
+    if constants.intersection(%w[ACTIVE_RECORD ACTION_VIEW]).any?
+      Semantic::Instrumentalizer.activate(*build_instrumentation_config)
+    end
   end
-
-  # im = nil
-  # Rails.autoloaders.main.on_load('ApplicationController') do
-  #   SemanticLogger[:zeitwerk].debug('reload!')
-  #   im = Semantic::InstrumentationManager.new
-  # end
-
-  # Semantic::InstrumentationManager.clear
-
-  #   bootstrap = [{ kind: :restored, constant: 'ACTION_VIEW', type: :boolean, old_value: false, new_value: true },
-  #                { kind: :restored, constant: 'ACTION_CONTROLLER', type: :boolean, old_value: false, new_value: true }]
-  #   im ||= Semantic::InstrumentationManager.new
-  #   im.process(bootstrap)
 end
 
-# RAILS_HOOKS = %i[
-#   action_controller
-#   action_controller_api
-#   action_controller_base
-#   action_dispatch_request
-#   action_dispatch_response
-#   action_view
-#   active_job
-#   active_model
-#   active_record
-#   active_record_fixture_set
-#   after_initialize
-#   after_routes_loaded
-#   before_configuration
-#   before_eager_load
-#   before_initialize
-#   i18n
-#   message_pack
-# ].freeze
+Rails.autoloaders.main.on_load('ApplicationController') do
+  Rails.logger.debug 'Zeitwerk RELOAD!'
+  Semantic::Instrumentalizer.activate(*build_instrumentation_config)
+end

lib/semantic/instrumentalizer.rb

@@ -1,12 +1,13 @@
 module Semantic
+  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
+
   # enable/disable instrumentation callbacks
   class Instrumentalizer
-    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
-
+    include SemanticLogger::Loggable
     class << self
       def activate(*event_groups)
         reset
@@ -15,24 +16,28 @@ module Semantic
 
       private
 
-      def logger = @logger ||= SemanticLogger[:instrumentation]
+      def global_subscribers = $global_subscribers ||= [] # rubocop:disable Style/GlobalVars
 
       def reset
+        global_subscribers.each { |sub| ActiveSupport::Notifications.unsubscribe(sub) }
+        global_subscribers.clear
+
         NOTIFICATIONS.each do |event_group, hooks|
-          hooks.each { |hook| ActiveSupport::Notifications.unsubscribe("#{hook}.#{event_group}") }
+          hooks.each do |hook|
+            hook_full_name = "#{hook}.#{event_group}"
+            ActiveSupport::Notifications.unsubscribe(hook_full_name)
+          end
         end
       end
 
       def enable(event_group)
-        logger.debug { "enabling: #{event_group}" }
-
         log_subscriber = build_log_subscriber_from(event_group)
         NOTIFICATIONS[event_group].each do |hook|
-          logger.info("subscribe to #{hook}.#{event_group}")
-          ActiveSupport::Notifications.subscribe("#{hook}.#{event_group}") do |event|
+          subscriber = ActiveSupport::Notifications.subscribe("#{hook}.#{event_group}") do |event|
             # logger.debug("SEND #{log_subscriber} hook=#{hook}")
             log_subscriber.send(hook, event)
           end
+          global_subscribers << subscriber
         end
       end