Module: SWF::Boot

Extended by:
Boot
Included in:
Boot
Defined in:
lib/swf/boot.rb

Defined Under Namespace

Classes: DeciderStartupFailure, WorkerStartupFailure

Instance Method Summary collapse

Instance Method Details

#settings ⇒ Object 



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# File 'lib/swf/boot.rb', line 99

def settings
  # override this in your usage to pull settings from, e.g., ENV or EC2 tags
  {domain_name: 'domain', task_list_name: 'task_list_name'}
end

#startup(deciders, workers, wait_for_children = false, &at_rescue) ⇒ Object 



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# File 'lib/swf/boot.rb', line 14

def startup(deciders, workers, wait_for_children = false, &at_rescue)
  child_pids =  deciders.to_i.times.map {
    Process.fork {
      Process.daemon(true) unless wait_for_children
      rescued = false
      begin
        swf_runner.be_decider
      rescue => e
        error = {
          error: e.inspect,
          backtrace: e.backtrace
        }
        if rescued
          begin
            raise SWF::Boot::DeciderStartupFailure, JSON.pretty_unparse(error)
          rescue SWF::Boot::DeciderStartupFailure => rescued_e
            if at_rescue
              at_rescue.call(rescued_e.to_s)
            else
              raise rescued_e
            end
          end
        else
          rescued = true
          retry
        end
      end
    }
  }

  child_pids += workers.to_i.times.map {
    Process.fork {
      Process.daemon(true) unless wait_for_children
      rescued = false
      begin
        swf_runner.be_worker
      rescue => e
        error = {
          error: e.inspect,
          backtrace: e.backtrace
        }
        if rescued
          begin
            raise SWF::Boot::WorkerStartupFailure, JSON.pretty_unparse(error)
          rescue SWF::Boot::WorkerStartupFailure => rescued_e
            if at_rescue
              at_rescue.call(rescued_e.to_s)
            else
              raise rescued_e
            end
          end
        else
          rescued = true
          retry
        end
      end
    }
  }

  puts "Forked #{deciders} deciders and #{workers} workers..."

  if wait_for_children
    %w(TERM INT).each {|signal| Signal.trap(signal) { terminate_children(child_pids) } }
    puts "Waiting on them..."
    child_pids.each {|pid| Process.wait(pid) }
  else
    child_pids.each {|pid| Process.detach(pid) }
  end

  child_pids

end

#swf_runner ⇒ Object 



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# File 'lib/swf/boot.rb', line 94

def swf_runner
  # define this in your usage
  SWF::Runner.new(settings[:domain_name], settings[:task_list_name])
end

#terminate_children(child_pids) ⇒ Object 



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# File 'lib/swf/boot.rb', line 87

def terminate_children(child_pids)
  child_pids.each {|pid|
    puts "Terminating #{pid}"
    Process.kill("TERM", pid)
  }
end