components/network_hints/renderer/renderer_preconnect.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // A RendererPreconnect instance is maintained for each RenderThread.
   6 // URL strings are typically added to the embedded queue during rendering.
   7 // The first addition to the queue (transitioning from empty to having
   8 // some names) causes a processing task to be added to the Renderer Thread.
   9 // The processing task gathers all buffered URLs, and send them via IPC
  10 // to the browser.
  11 // This class counts repeated requests for the same URL and requests that
  12 // number of connections be preconnected. If multiple requests are sent
  13 // separately the net stack will just keep re-using the first pending
  14 // connection so we allow for the time between the parsing of the tags and
  15 // when the task is scheduled to accumulate multiple requests.
  16
  17 #ifndef COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_PRECONNECT_H_
  18 #define COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_PRECONNECT_H_
  19
  20 #include "url/gurl.h"
  21
  22 namespace network_hints {
  23
  24 // An internal interface to the network_hints component for efficiently sending
  25 // DNS prefetch requests to the net stack.
  26 class RendererPreconnect {
  27  public:
  28   RendererPreconnect();
  29   ~RendererPreconnect();
  30
  31   // Submit a preconnect request for a single connection.
  32   void Preconnect(const GURL &url);
  33
  34  private:
  35
  36   DISALLOW_COPY_AND_ASSIGN(RendererPreconnect);
  37 };  // class RendererPreconnect
  38
  39 }  // namespace network_hints
  40
  41 #endif  // COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_PRECONNECT_H_