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Contents
# frozen_string_literal: true
module Karafka
module Routing
module Features
# Feature allowing us to get visibility during the consumption into metrics of particular
# partition we operate on. It can be useful when making context-aware consumers that change
# their behaviours based on the lag and other parameters.
class InlineInsights < Base
class << self
# If needed installs the needed listener and initializes tracker
#
# @param _config [Karafka::Core::Configurable::Node] app config
def post_setup(_config)
::Karafka::App.monitor.subscribe('app.running') do
# Do not activate tracking of statistics if none of our active topics uses it
# This prevents us from tracking metrics when user just runs a subset of topics
# in a given process and none of those actually utilizes this feature
next unless ::Karafka::App
.subscription_groups
.values
.flat_map(&:itself)
.flat_map(&:topics)
.flat_map(&:to_a)
.any?(&:inline_insights?)
# Initialize the tracker prior to becoming multi-threaded
::Karafka::Processing::InlineInsights::Tracker.instance
# Subscribe to the statistics reports and collect them
::Karafka.monitor.subscribe(
::Karafka::Processing::InlineInsights::Listener.new
)
end
end
end
end
end
end
end
Version data entries
33 entries across 33 versions & 1 rubygems