Module: AsyncRender::Warmup

Extended by:
ActiveSupport::Concern
Includes:
Utils
Defined in:
lib/async_render/warmup.rb

Constant Summary collapse

POOL = 
AsyncRender.executor

Instance Method Summary collapse

Methods included from Utils

#build_memoized_render_key, #generate_token, #normalize_locals

Instance Method Details

#warmup_render(partial, locals = {}) ⇒ Object

Queue an async render for a partial so views can reference it via placeholders. The result is stitched into the HTML by the middleware.



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# File 'lib/async_render/warmup.rb', line 29

def warmup_render(partial, locals = {})
  return unless AsyncRender.enabled

  AsyncRender::Current.skip_middleware = false

  warmup_key = build_memoized_render_key(partial, locals)
  placeholder = AsyncRender::Current.warmup_partials[warmup_key]
  return placeholder if placeholder

  token       = generate_token(partial)
  placeholder = (AsyncRender::PLACEHOLDER_TEMPLATE % token).html_safe
  state       = AsyncRender.dump_state_proc&.call
  AsyncRender::Current.warmup_partials[warmup_key] = placeholder

  AsyncRender::Current.async_futures[token] = Concurrent::Promises.future_on(POOL) do
    AsyncRender::Executor.new(partial:, locals:, state:).call
  end

  placeholder
end