Class: GraphQL::Dataloader::AsyncDataloader

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

Instance Method Summary collapse

Instance Method Details

#run(trace_query_lazy: nil) ⇒ Object 



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# File 'lib/graphql/dataloader/async_dataloader.rb', line 17

def run(trace_query_lazy: nil)
  trace = Fiber[:__graphql_current_multiplex]&.current_trace
  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
    trace&.begin_dataloader(self)
    while first_pass || !job_fibers.empty?
      first_pass = false
      fiber_vars = get_fiber_variables

      run_pending_steps(job_fibers, next_job_fibers, source_tasks, jobs_fiber_limit, trace)

      Sync do |root_task|
        set_fiber_variables(fiber_vars)
        while !source_tasks.empty? || @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, trace))))
            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

      if !@lazies_at_depth.empty?
        with_trace_query_lazy(trace_query_lazy) do
          run_next_pending_lazies(job_fibers, trace)
          run_pending_steps(job_fibers, next_job_fibers, source_tasks, jobs_fiber_limit, trace)
        end
      end
    end
    trace&.end_dataloader(self)
  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(source = Fiber[:__graphql_current_dataloader_source]) ⇒ Object 



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

def yield(source = Fiber[:__graphql_current_dataloader_source])
  trace = Fiber[:__graphql_current_multiplex]&.current_trace
  trace&.dataloader_fiber_yield(source)
  if (condition = Fiber[:graphql_dataloader_next_tick])
    condition.wait
  else
    Fiber.yield
  end
  trace&.dataloader_fiber_resume(source)
  nil
end