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module ActionCable
module Channel
module PeriodicTimers
extend ActiveSupport::Concern
included do
class_attribute :periodic_timers, instance_reader: false
self.periodic_timers = []
after_subscribe :start_periodic_timers
after_unsubscribe :stop_periodic_timers
end
module ClassMethods
# Allows you to call a private method <tt>every</tt> so often seconds. This periodic timer can be useful
# for sending a steady flow of updates to a client based off an object that was configured on subscription.
# It's an alternative to using streams if the channel is able to do the work internally.
def periodically(callback, every:)
self.periodic_timers += [ [ callback, every: every ] ]
end
end
private
def active_periodic_timers
@active_periodic_timers ||= []
end
def start_periodic_timers
self.class.periodic_timers.each do |callback, options|
active_periodic_timers << connection.server.event_loop.timer(options[:every]) do
connection.worker_pool.async_run_periodic_timer(self, callback)
end
end
end
def stop_periodic_timers
active_periodic_timers.each { |timer| timer.shutdown }
end
end
end
end
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