Class: Skiplock::Dispatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/skiplock/dispatcher.rb

Instance Method Summary collapse

Constructor Details

#initialize(master: true) ⇒ Dispatcher

Returns a new instance of Dispatcher.



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# File 'lib/skiplock/dispatcher.rb', line 3

def initialize(master: true)
  @executor = Concurrent::ThreadPoolExecutor.new(min_threads: Settings['min_threads'], max_threads: Settings['max_threads'], max_queue: Settings['max_threads'], idletime: 60, auto_terminate: true, fallback_policy: :discard)
  @master = master
  @next_schedule_at = Time.now.to_f
  @running = true
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/skiplock/dispatcher.rb', line 10

def run
  Thread.new do
    Rails.application.reloader.wrap do
      sleep(0.1) while @running && !Rails.application.initialized?
      ActiveRecord::Base.connection_pool.with_connection do |connection|
        connection.exec_query('LISTEN skiplock')
        if @master
          # reset retries schedules on startup
          Job.where('scheduled_at > NOW() AND executions IS NOT NULL AND expired_at IS NULL AND finished_at IS NULL').update_all(scheduled_at: nil, updated_at: Time.now)
          Cron.setup
        end
        error = false
        while @running
          begin
            if error
              unless connection.active?
                connection.reconnect!
                sleep(0.5)
                connection.exec_query('LISTEN skiplock')
                @next_schedule_at = Time.now
              end
              error = false
            end
            if Time.now.to_f >= @next_schedule_at && @executor.remaining_capacity > 0
              @executor.post { do_work }
            end
            notifications = []
            connection.raw_connection.wait_for_notify(0.1) do |channel, pid, payload|
              notifications << payload if payload
              loop do
                payload = connection.raw_connection.notifies
                break unless @running && payload
                notifications << payload[:extra]
              end
              notifications.each do |n|
                op, id, queue, priority, time = n.split(',')
                if time.to_f <= Time.now.to_f
                  @next_schedule_at = Time.now.to_f
                elsif time.to_f < @next_schedule_at
                  @next_schedule_at = time.to_f
                end
              end
            end
          rescue Exception => ex
            # TODO: Report exception
            error = true
            timestamp = Time.now
            while @running
              sleep(0.5)
              break if Time.now - timestamp > 10
            end              
          end
          sleep(0.1)
        end
        connection.exec_query('UNLISTEN *')
      end
    end
  end
end

#shutdown(wait: true) ⇒ Object 



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# File 'lib/skiplock/dispatcher.rb', line 70

def shutdown(wait: true)
  @running = false
  @executor.shutdown
  @executor.wait_for_termination if wait
end