Class: Karafka::Web::Tracking::Consumers::Listeners::Connections

Inherits:
Base
  • Object
show all
Defined in:
lib/karafka/web/tracking/consumers/listeners/connections.rb

Overview

Listener for listening on connections related events like polling, etc

Instance Method Summary collapse

Instance Method Details

#on_connection_listener_after_fetch_loop(event) ⇒ Object

When fetch loop is done it means this subscription group is no longer active and we should stop reporting. The listener was stopped.

Parameters:

  • event (Karafka::Core::Monitoring::Event) 


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# File 'lib/karafka/web/tracking/consumers/listeners/connections.rb', line 25

def on_connection_listener_after_fetch_loop(event)
  subscription_group = event[:subscription_group]
  sg_id = subscription_group.id
  cg_id = subscription_group.consumer_group.id

  track do |sampler|
    sampler.consumer_groups[cg_id][:subscription_groups].delete(sg_id)
    sampler.subscription_groups.delete(sg_id)
  end
end

#on_connection_listener_before_fetch_loop(event) ⇒ Object

Initializes the subscription group with defaults so it is always available

Parameters:

  • event (Karafka::Core::Monitoring::Event) 


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# File 'lib/karafka/web/tracking/consumers/listeners/connections.rb', line 12

def on_connection_listener_before_fetch_loop(event)
  sg_id = event[:subscription_group].id

  track do |sampler|
    # This will initialize the hash upon first request
    sampler.subscription_groups[sg_id]
  end
end

#on_connection_listener_fetch_loop_received(event) ⇒ Object

Tracks the moment a poll happened on a given subscription group

Parameters:

  • event (Karafka::Core::Monitoring::Event) 


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# File 'lib/karafka/web/tracking/consumers/listeners/connections.rb', line 39

def on_connection_listener_fetch_loop_received(event)
  sg_id = event[:subscription_group].id

  track do |sampler|
    sampler.subscription_groups[sg_id][:polled_at] = monotonic_now
  end
end