class Mmtrix::Agent::Instrumentation::ActiveRecordSubscriber
Constants
- CACHED_QUERY_NAME
Public Class Methods
new()
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Calls superclass method
# File lib/mmtrix/agent/instrumentation/active_record_subscriber.rb, line 16 def initialize # We cache this in an instance variable to avoid re-calling method # on each query. @explainer = method(:get_explain_plan) super end
Public Instance Methods
active_record_config_for_event(event)
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# File lib/mmtrix/agent/instrumentation/active_record_subscriber.rb, line 85 def active_record_config_for_event(event) return unless event.payload[:connection_id] connection = nil connection_id = event.payload[:connection_id] ::ActiveRecord::Base.connection_handler.connection_pool_list.each do |handler| connection = handler.connections.detect do |conn| conn.object_id == connection_id end break if connection end connection.instance_variable_get(:@config) if connection end
finish(name, id, payload)
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# File lib/mmtrix/agent/instrumentation/active_record_subscriber.rb, line 31 def finish(name, id, payload) #THREAD_LOCAL_ACCESS return if payload[:name] == CACHED_QUERY_NAME state = Mmtrix::Agent::TransactionState.tl_get return unless state.is_execution_traced? event = pop_event(id) config = active_record_config_for_event(event) base_metric = record_metrics(event, config) notice_sql(state, event, config, base_metric) rescue => e log_notification_error(e, name, 'finish') end
get_explain_plan( config, query )
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# File lib/mmtrix/agent/instrumentation/active_record_subscriber.rb, line 43 def get_explain_plan( config, query ) connection = Mmtrix::Agent::Database.get_connection(config) do ::ActiveRecord::Base.send("#{config[:adapter]}_connection", config) end if connection && connection.respond_to?(:execute) return connection.execute("EXPLAIN #{query}") end end
notice_sql(state, event, config, metric)
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# File lib/mmtrix/agent/instrumentation/active_record_subscriber.rb, line 53 def notice_sql(state, event, config, metric) stack = state.traced_method_stack # enter transaction trace node frame = stack.push_frame(state, :active_record, event.time) Mmtrix::Agent.instance.transaction_sampler \ .notice_sql(event.payload[:sql], config, Helper.milliseconds_to_seconds(event.duration), state, @explainer) Mmtrix::Agent.instance.sql_sampler \ .notice_sql(event.payload[:sql], metric, config, Helper.milliseconds_to_seconds(event.duration), state, @explainer) # exit transaction trace node stack.pop_frame(state, frame, metric, event.end) end
record_metrics(event, config)
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# File lib/mmtrix/agent/instrumentation/active_record_subscriber.rb, line 73 def record_metrics(event, config) #THREAD_LOCAL_ACCESS base, *other_metrics = ActiveRecordHelper.metrics_for(event.payload[:name], Mmtrix::Helper.correctly_encoded(event.payload[:sql]), config && config[:adapter]) Mmtrix::Agent.instance.stats_engine.tl_record_scoped_and_unscoped_metrics( base, other_metrics, Helper.milliseconds_to_seconds(event.duration)) base end
start(name, id, payload)
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Calls superclass method
# File lib/mmtrix/agent/instrumentation/active_record_subscriber.rb, line 23 def start(name, id, payload) #THREAD_LOCAL_ACCESS return if payload[:name] == CACHED_QUERY_NAME return unless Mmtrix::Agent.tl_is_execution_traced? super rescue => e log_notification_error(e, name, 'start') end