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Original file line number Diff line number Diff line change
Expand Up @@ -30,19 +30,23 @@ def self.subscribe(

subscriber_object = ::ActiveSupport::Notifications.subscribe(pattern, subscriber)

::ActiveSupport::Notifications.notifier.synchronize do
subscribers = ::ActiveSupport::Notifications.notifier.instance_variable_get(:@string_subscribers)[pattern]

if subscribers.nil?
OpenTelemetry.handle_error(
message: 'Unable to move OTEL ActiveSupport Notifications subscriber to the front of the notifications list which may cause incomplete traces.' \
'Please report an issue here: ' \
'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues/new?labels=bug&template=bug_report.md&title=ActiveSupport%20Notifications%20subscribers%20list%20is%20nil'
)
else
subscribers.unshift(
subscribers.delete(subscriber_object)
)
# this can be removed once we drop support for Rails < 7.2
# see https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/707 for more context
if ::ActiveSupport::Notifications.notifier.respond_to?(:synchronize)
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Do we want to leave any comments to our future selves that we can remove this block once everything prior to 7.2 is EoL?

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I'm happy to add a comment!

::ActiveSupport::Notifications.notifier.synchronize do
subscribers = ::ActiveSupport::Notifications.notifier.instance_variable_get(:@string_subscribers)[pattern]

if subscribers.nil?
OpenTelemetry.handle_error(
message: 'Unable to move OTEL ActiveSupport Notifications subscriber to the front of the notifications list which may cause incomplete traces.' \
'Please report an issue here: ' \
'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues/new?labels=bug&template=bug_report.md&title=ActiveSupport%20Notifications%20subscribers%20list%20is%20nil'
)
else
subscribers.unshift(
subscribers.delete(subscriber_object)
)
end
end
end
subscriber_object
Expand Down