Cancelling a workflow

There are cases when a workflow needs to exit before all tasks could have been processed. In order to do so, return false from any task. This will cause the corresponding job to be given up and the workflow to stop running.

Cancelled workflows can be resumed, given the given up job has not been permanently removed yet.

class WatchGame < Pallets::Workflow
  task TurnOnTv
  task SwitchToSportsChannel => TurnOnTv
end

class TurnOnTv < Pallets::Task
  def run
    power = Power.status
    # Cancel the workflow and do not run :switch_to_sports_channel anymore
    return false if power == 'down'
  end
end