refaactor: rename method

instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/subscriber.rb

@@ -49,18 +49,27 @@ def deserialize(job_data)
 module OpenTelemetry
   module Instrumentation
     module ActiveJob
+
       class EnqueueSubscriber
+        def initialize(tracer)
+          @tracer = tracer
+        end
+
         def on_start(name, _id, payload, subscriber)
-          span = subscriber.tracer.start_span("#{payload.fetch(:job).queue_name} publish",
+          span = @tracer.start_span("#{payload.fetch(:job).queue_name} publish",
           kind: :producer,
-          attributes: subscriber.job_attributes(payload.fetch(:job)))
+          attributes: subscriber.as_otel_semconv_attrs(payload.fetch(:job)))
           tokens = [OpenTelemetry::Context.attach(OpenTelemetry::Trace.context_with_span(span))]
           OpenTelemetry.propagation.inject(payload.fetch(:job).__otel_headers) # This must be transmitted over the wire
           { span: span, ctx_tokens: tokens }
         end
       end
 
       class PerformSubscriber
+        def initialize(tracer)
+          @tracer = tracer
+        end
+
         def on_start(name, _id, payload, subscriber)
           tokens = []
           parent_context = OpenTelemetry.propagation.extract(payload.fetch(:job).__otel_headers)
@@ -71,10 +80,10 @@ def on_start(name, _id, payload, subscriber)
             links = [OpenTelemetry::Trace::Link.new(span_context)]
           end
 
-          span = subscriber.tracer.start_span(
+          span = @tracer.start_span(
             "#{payload.fetch(:job).queue_name} process",
             kind: :consumer,
-            attributes: subscriber.job_attributes(payload.fetch(:job)),
+            attributes: subscriber.as_otel_semconv_attrs(payload.fetch(:job)),
             links: links
           )
 
@@ -87,12 +96,19 @@ def on_start(name, _id, payload, subscriber)
       end
 
       class Subscriber < ::ActiveSupport::Subscriber
-        TEST_ADAPTERS = %w[async inline]
         EVENT_HANDLERS = {
-          'enqueue.active_job' => EnqueueSubscriber.new,
-          'perform.active_job' => PerformSubscriber.new,
+          'enqueue.active_job' => EnqueueSubscriber.new(OpenTelemetry.tracer_provider.tracer('otel-active_job', '0.0.1')),
+          'perform.active_job' => PerformSubscriber.new(OpenTelemetry.tracer_provider.tracer('otel-active_job', '0.0.1')),
         }
 
+        def initialize(...)
+          super
+          @handlers_by_pattern = {
+            'enqueue.active_job' => EnqueueSubscriber.new(OpenTelemetry.tracer_provider.tracer('otel-active_job', '0.0.1')),
+            'perform.active_job' => PerformSubscriber.new(OpenTelemetry.tracer_provider.tracer('otel-active_job', '0.0.1')),
+          }
+        end
+
         attach_to :active_job
 
         # The methods below are the events the Subscriber is interested in.
@@ -101,7 +117,7 @@ def perform(...);end
 
         def start(name, id, payload)
           begin
-            payload.merge!(__otel: EVENT_HANDLERS.fetch(name).on_start(name, id, payload, self)) # The payload is _not_ transmitted over the wire
+            payload.merge!(__otel: @handlers_by_pattern.fetch(name).on_start(name, id, payload, self)) # The payload is _not_ transmitted over the wire
           rescue StandardError => error
             OpenTelemetry.handle_error(exception: error)
           end
@@ -136,13 +152,15 @@ def finish(_name, _id, payload)
         end
 
         def on_start(name, _id, payload)
-          span = tracer.start_span(name, attributes: job_attributes(payload.fetch(:job)))
+          span = tracer.start_span(name, attributes: as_otel_semconv_attrs(payload.fetch(:job)))
           tokens = [OpenTelemetry::Context.attach(OpenTelemetry::Trace.context_with_span(span))]
           OpenTelemetry.propagation.inject(payload.fetch(:job).__otel_headers) # This must be transmitted over the wire
           { span: span, ctx_tokens: tokens }
         end
 
-        def job_attributes(job)
+        def as_otel_semconv_attrs(job)
+          test_adapters = %w[async inline]
+
           otel_attributes = {
             'code.namespace' => job.class.name,
             'messaging.destination_kind' => 'queue',
@@ -153,7 +171,7 @@ def job_attributes(job)
             'messaging.active_job.priority' => job.priority
           }
 
-          otel_attributes['net.transport'] = 'inproc' if TEST_ADAPTERS.include?(job.class.queue_adapter_name)
+          otel_attributes['net.transport'] = 'inproc' if test_adapters.include?(job.class.queue_adapter_name)
           otel_attributes.compact!
 
           otel_attributes