Class: CronoTrigger::PollingThread

Inherits:
Object
  • Object
show all
Defined in:
lib/crono_trigger/polling_thread.rb

Instance Method Summary collapse

Constructor Details

#initialize(model_queue, stop_flag, logger, executor, execution_counter) ⇒ PollingThread

Returns a new instance of PollingThread.



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# File 'lib/crono_trigger/polling_thread.rb', line 3

def initialize(model_queue, stop_flag, logger, executor, execution_counter)
  @model_queue = model_queue
  @stop_flag = stop_flag
  @logger = logger
  @executor = executor
  if @executor.fallback_policy != :caller_runs
    raise ArgumentError, "executor's fallback policies except for :caller_runs are not supported"
  end
  @execution_counter = execution_counter
  @quiet = Concurrent::AtomicBoolean.new(false)
  @worker_count = 1
end

Instance Method Details

#alive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/crono_trigger/polling_thread.rb', line 52

def alive?
  @thread.alive?
end

#join ⇒ Object 



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# File 'lib/crono_trigger/polling_thread.rb', line 40

def join
  @thread.join
end

#poll(model) ⇒ Object 



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# File 'lib/crono_trigger/polling_thread.rb', line 56

def poll(model)
  @logger.info "(polling-thread-#{Thread.current.object_id}) Poll #{model}"

  maybe_has_next = true
  while maybe_has_next && !@stop_flag.set?
    records, maybe_has_next = model.connection_pool.with_connection do
      model.executables_with_lock(limit: CronoTrigger.config.fetch_records || CronoTrigger.config.executor_thread * 3, worker_count: @worker_count)
    end

    records.each do |record|
      @executor.post do
        @execution_counter.increment
        begin
          process_record(record)
        ensure
          @execution_counter.decrement
        end
      end
    end
  end
end

#quiet ⇒ Object 



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# File 'lib/crono_trigger/polling_thread.rb', line 44

def quiet
  @quiet.make_true
end

#quiet? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/crono_trigger/polling_thread.rb', line 48

def quiet?
  @quiet.true?
end

#run ⇒ Object 



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# File 'lib/crono_trigger/polling_thread.rb', line 16

def run
  @thread = Thread.start do
    @logger.info "(polling-thread-#{Thread.current.object_id}) Start polling thread"
    until @stop_flag.wait_for_set(CronoTrigger.config.polling_interval)
      next if quiet?

      CronoTrigger.reloader.call do
        begin
          model_name = @model_queue.pop(true)
          model = model_name.classify.constantize
          poll(model)
        rescue ThreadError => e
          @logger.error(e) unless e.message == "queue empty"
        rescue => ex
          @logger.error(ex)
          CronoTrigger::GlobalExceptionHandler.handle_global_exception(ex)
        ensure
          @model_queue << model_name if model_name
        end
      end
    end
  end
end

#worker_count=(n) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/crono_trigger/polling_thread.rb', line 78

def worker_count=(n)
  raise ArgumentError, "worker_count must be greater than 0" if n <= 0
  @worker_count = n
end