You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: timer_task.rb
    path of file: ./repos/sidekiq-unique-jobs/lib/sidekiq_unique_jobs
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "concurrent/collection/copy_on_no
    
    def execute_task(completion)
      return nil unless @running.true?

      _success, value, reason = @executor.execute(self)
      if completion.try?
        self.value = value
        schedule_next_task
        time = Time.now
        observers.notify_observers do
          [time, self.value, reason]
        end
      end