chrome/renderer/net/error_cache_load.h

   1 // Copyright 2014 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 #ifndef CHROME_RENDERER_NET_ERROR_CACHE_LOAD_H_
   6 #define CHROME_RENDERER_NET_ERROR_CACHE_LOAD_H_
   7
   8 #include "base/basictypes.h"
   9 #include "content/public/renderer/render_frame_observer.h"
  10 #include "gin/wrappable.h"
  11 #include "url/gurl.h"
  12
  13 // ErrorCacheLoad class:
  14 //
  15 // This class makes cache loading operations available to the
  16 // error page loaded by NetErrorHelper.  It is bound to the javascript
  17 // window.errorCacheLoad object.
  18
  19 class GURL;
  20
  21 namespace content {
  22 class RenderFrame;
  23 }
  24
  25 class ErrorCacheLoad : public gin::Wrappable<ErrorCacheLoad>,
  26                        public content::RenderFrameObserver {
  27  public:
  28   static gin::WrapperInfo kWrapperInfo;
  29
  30   static void Install(content::RenderFrame* render_frame, const GURL& page_url);
  31
  32  private:
  33   ErrorCacheLoad(content::RenderFrame* render_frame, const GURL& page_url);
  34   virtual ~ErrorCacheLoad();
  35
  36   // Loads the original URL associated with the frame, with the blink
  37   // ReturnCacheDataDontLoad flag set to make sure that the value is
  38   // only gotten from cache.
  39   bool ReloadStaleInstance();
  40
  41   // gin::WrappableBase
  42   virtual gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
  43       v8::Isolate* isolate) OVERRIDE;
  44
  45   // RenderFrameObserver.  Overridden to avoid being destroyed when RenderFrame
  46   // goes away; ErrorCacheLoad objects are owned by the JS garbage collector.
  47   virtual void OnDestruct() OVERRIDE;
  48
  49   // We'll be torn down by V8 when the page goes away, so it's safe to hold
  50   // a naked pointer to the render frame.
  51   content::RenderFrame* render_frame_;
  52
  53   const GURL page_url_;
  54
  55   bool render_frame_destroyed_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(ErrorCacheLoad);
  58 };
  59
  60 #endif  // CHROME_RENDERER_NET_ERROR_CACHE_LOAD_H_