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Contents
# frozen_string_literal: true
module Karafka
module Core
module Monitoring
# Karafka monitor that can be used to pass through instrumentation calls to selected
# notifications bus.
#
# It provides abstraction layer that allows us to use both our internal notifications as well
# as `ActiveSupport::Notifications`.
class Monitor
# Empty has to save on objects allocation
EMPTY_HASH = {}.freeze
private_constant :EMPTY_HASH
# @param notifications_bus [Object] either our internal notifications bus or
# `ActiveSupport::Notifications`
# @param namespace [String, nil] namespace for events or nil if no namespace
def initialize(notifications_bus, namespace = nil)
@notifications_bus = notifications_bus
@namespace = namespace
@mapped_events = {}
end
# Passes the instrumentation block (if any) into the notifications bus
#
# @param event_id [String, Symbol] event id
# @param payload [Hash]
# @param block [Proc] block we want to instrument (if any)
def instrument(event_id, payload = EMPTY_HASH, &block)
full_event_name = @mapped_events[event_id] ||= [event_id, @namespace].compact.join('.')
@notifications_bus.instrument(full_event_name, payload, &block)
end
# Allows us to subscribe to the notification bus
#
# @param args [Array] any arguments that the notification bus subscription layer accepts
# @param block [Proc] optional block for subscription
def subscribe(*args, &block)
@notifications_bus.subscribe(*args, &block)
end
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems