Class: GraphQL::Dataloader::AsyncDataloader

Inherits:
GraphQL::Dataloader show all
Defined in:
lib/graphql/dataloader/async_dataloader.rb

Constant Summary

Constants inherited from GraphQL::Dataloader

NonblockingDataloader

Instance Method Summary collapse

Methods inherited from GraphQL::Dataloader

#append_job, #clear_cache, #get_fiber_variables, #initialize, #nonblocking?, #run_fiber, #run_isolated, #set_fiber_variables, #spawn_fiber, use, #with, with_dataloading

Constructor Details

This class inherits a constructor from GraphQL::Dataloader

Instance Method Details

#run ⇒ Object 



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# File 'lib/graphql/dataloader/async_dataloader.rb', line 10

def run
  job_tasks = []
  next_job_tasks = []
  source_tasks = []
  next_source_tasks = []
  first_pass = true
  jobs_condition = Async::Condition.new
  sources_condition = Async::Condition.new
  Sync do |root_task|
    while first_pass || job_tasks.any?
      first_pass = false

      while (task = job_tasks.shift || spawn_job_task(root_task, jobs_condition))
        if task.alive?
          next_job_tasks << task
        elsif task.failed?
          # re-raise a raised error -
          # this also covers errors from sources since
          # these jobs wait for sources as needed.
          task.wait
        end
      end
      root_task.yield # give job tasks a chance to run
      job_tasks.concat(next_job_tasks)
      next_job_tasks.clear

      while source_tasks.any? || @source_cache.each_value.any? { |group_sources| group_sources.each_value.any?(&:pending?) }
        while (task = source_tasks.shift || spawn_source_task(root_task, sources_condition))
          if task.alive?
            next_source_tasks << task
          end
        end
        root_task.yield # give source tasks a chance to run
        sources_condition.signal
        source_tasks.concat(next_source_tasks)
        next_source_tasks.clear
      end
      jobs_condition.signal
    end
  end
rescue UncaughtThrowError => e
  throw e.tag, e.value
end

#yield ⇒ Object 



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# File 'lib/graphql/dataloader/async_dataloader.rb', line 5

def yield
  Thread.current[:graphql_dataloader_next_tick].wait
  nil
end