Class: GraphQL::Dataloader::AsyncDataloader

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

Instance Attribute Summary

Attributes inherited from GraphQL::Dataloader

#fiber_limit

Instance Method Summary collapse

Methods inherited from GraphQL::Dataloader

#append_job, #cleanup_fiber, #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 14

def run
  jobs_fiber_limit, total_fiber_limit = calculate_fiber_limit
  job_fibers = []
  next_job_fibers = []
  source_tasks = []
  next_source_tasks = []
  first_pass = true
  sources_condition = Async::Condition.new
  manager = spawn_fiber do
    while first_pass || job_fibers.any?
      first_pass = false
      fiber_vars = get_fiber_variables

      while (f = (job_fibers.shift || (((job_fibers.size + next_job_fibers.size + source_tasks.size) < jobs_fiber_limit) && spawn_job_fiber)))
        if f.alive?
          finished = run_fiber(f)
          if !finished
            next_job_fibers << f
          end
        end
      end
      job_fibers.concat(next_job_fibers)
      next_job_fibers.clear

      Sync do |root_task|
        set_fiber_variables(fiber_vars)
        while source_tasks.any? || @source_cache.each_value.any? { |group_sources| group_sources.each_value.any?(&:pending?) }
          while (task = (source_tasks.shift || (((job_fibers.size + next_job_fibers.size + source_tasks.size + next_source_tasks.size) < total_fiber_limit) && spawn_source_task(root_task, sources_condition))))
            if task.alive?
              root_task.yield # give the source task a chance to run
              next_source_tasks << task
            end
          end
          sources_condition.signal
          source_tasks.concat(next_source_tasks)
          next_source_tasks.clear
        end
      end
    end
  end

  manager.resume
  if manager.alive?
    raise "Invariant: Manager didn't terminate successfully: #{manager}"
  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
  if (condition = Thread.current[:graphql_dataloader_next_tick])
    condition.wait
  else
    Fiber.yield
  end
  nil
end