Class: Tasque::Processor

Inherits:
Object
  • Object
show all
Defined in:
lib/tasque/processor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Processor

Returns a new instance of Processor.



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# File 'lib/tasque/processor.rb', line 7

def initialize
  @timers = Timers::Group.new
  @last_task = false
  @current_task = nil
  @handlers = {}
end

Instance Attribute Details

#timers ⇒ Object (readonly)

Returns the value of attribute timers.



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# File 'lib/tasque/processor.rb', line 5

def timers
  @timers
end

Instance Method Details

#add_handler(type, &block) ⇒ Object 



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# File 'lib/tasque/processor.rb', line 14

def add_handler type, &block
  @handlers[type.to_sym] = Proc.new do |task|
    @current_task = task
    task.process
    begin
      task.result = block.call task
      task.complete
    rescue Tasque::TaskCancel => e
      task.cancel
    rescue Tasque::TaskError => e
      task.result = {
        task_error: e.task_error
      }
      task.failure
    rescue Exception => e
      task.result = {
        exception: e.message,
        backtrace: e.backtrace
      }
      task.failure
    end
    @current_task = nil
  end
  @timers.every(check_interval) do
    begin
      has_task = Tasque::Task.fetch(type) do |task|
        @handlers[type.to_sym].call(task)
      end
    rescue ActiveRecord::Deadlocked, ActiveRecord::LockWaitTimeout, RedisMutex::LockError
      retry
    end while has_task
  end
end

#start ⇒ Object 



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# File 'lib/tasque/processor.rb', line 48

def start
  shutdown = ->(signo) {
    if @last_task
      unless @current_task.nil?
        @current_task.failure
        @current_task.reprocess
      end
      exit! 
    end
    @last_task = true
  }
  trap("SIGINT", shutdown)
  trap("SIGTERM", shutdown)
  if Tasque.config.heartbeat && defined?(Insque)
    heartbeat_thread = Thread.new do
      heartbeat_timers = Timers::Group.new
      heartbeat_timers.every(Tasque.config.heartbeat_interval) do
        message = {
          worker: Tasque.config.worker,
          busy: !@current_task.nil?,
          current_task: @current_task.try(:id)
        }.merge(Tasque.config.heartbeat_payload)
        Insque.broadcast :heartbeat, message
      end
      loop do
        heartbeat_timers.wait
      end
    end
    heartbeat_thread.abort_on_exception = true
  end
  loop do
    break if @last_task
    @timers.wait
  end
end