class NewRelic::Agent::Instrumentation::ActionViewSubscriber
Constants
- RENDER_COLLECTION_EVENT_NAME
- RENDER_LAYOUT_EVENT_NAME
- RENDER_PARTIAL_EVENT_NAME
- RENDER_TEMPLATE_EVENT_NAME
Public Instance Methods
finish_segment(id, payload)
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# File lib/new_relic/agent/instrumentation/action_view_subscriber.rb, line 25 def finish_segment(id, payload) if segment = pop_segment(id) if exception = exception_object(payload) segment.notice_error(exception) end segment.finish end end
format_metric_name(event_name, payload, parent)
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# File lib/new_relic/agent/instrumentation/action_view_subscriber.rb, line 34 def format_metric_name(event_name, payload, parent) return parent.name if parent \ && (payload[:virtual_path] \ || (parent.identifier =~ /template$/)) if payload.key?(:virtual_path) identifier = payload[:virtual_path] else identifier = payload[:identifier] end "View/#{metric_path(event_name, identifier)}/#{metric_action(event_name)}" end
metric_action(name)
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# File lib/new_relic/agent/instrumentation/action_view_subscriber.rb, line 63 def metric_action(name) case name when /#{RENDER_TEMPLATE_EVENT_NAME}$/o then 'Rendering' when RENDER_PARTIAL_EVENT_NAME then 'Partial' when RENDER_COLLECTION_EVENT_NAME then 'Partial' when RENDER_LAYOUT_EVENT_NAME then 'Layout' else NewRelic::UNKNOWN end end
metric_path(name, identifier)
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# File lib/new_relic/agent/instrumentation/action_view_subscriber.rb, line 73 def metric_path(name, identifier) # Rails 5 sets identifier to nil for empty collections, # so do not mistake rendering a collection for rendering a file. if identifier.nil? && name != RENDER_COLLECTION_EVENT_NAME 'file' elsif /template$/.match?(identifier) identifier elsif identifier && (parts = identifier.split('/')).size > 1 parts[-2..-1].join('/') else ::NewRelic::Agent::UNKNOWN_METRIC end end
recordable?(event_name, metric_name)
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Nearly every “render_blah.action_view” event has a child in the form of “!render_blah.action_view”. The children are the ones we want to record. There are a couple special cases of events without children.
# File lib/new_relic/agent/instrumentation/action_view_subscriber.rb, line 52 def recordable?(event_name, metric_name) event_name[0] == '!' \ || metric_name == 'View/text template/Rendering' \ || metric_name == "View/#{::NewRelic::Agent::UNKNOWN_METRIC}/Partial" end
start_segment(name, id, payload)
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# File lib/new_relic/agent/instrumentation/action_view_subscriber.rb, line 13 def start_segment(name, id, payload) parent = segment_stack[id].last metric_name = format_metric_name(name, payload, parent) event = ActionViewEvent.new(metric_name, payload[:identifier]) if recordable?(name, metric_name) event.finishable = Tracer.start_segment(name: metric_name) end push_segment(id, event) end