chrome/browser/prerender/prerender_pending_swap_throttle.h

   1 // Copyright 2013 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_BROWSER_PRERENDER_PRERENDER_PENDING_SWAP_THROTTLE_H_
   6 #define CHROME_BROWSER_PRERENDER_PRERENDER_PENDING_SWAP_THROTTLE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "content/public/browser/resource_throttle.h"
  12
  13 namespace net {
  14 class URLRequest;
  15 }
  16
  17 namespace prerender {
  18
  19 class PrerenderTracker;
  20
  21 // This class implements policy on main frame navigations for prerenders
  22 // which we would like to swap, but are pending session storage namespace
  23 // merges. If the merge failed, we will release the throttle. If the merge
  24 // succeeded, we will swap the prerender, making the underlying request
  25 // obsolete.
  26 class PrerenderPendingSwapThrottle
  27     : public content::ResourceThrottle,
  28       public base::SupportsWeakPtr<PrerenderPendingSwapThrottle> {
  29  public:
  30   PrerenderPendingSwapThrottle(net::URLRequest* request,
  31                                PrerenderTracker* tracker);
  32
  33   // content::ResourceThrottle implementation:
  34   virtual void WillStartRequest(bool* defer) OVERRIDE;
  35
  36   virtual const char* GetNameForLogging() const OVERRIDE;
  37
  38   // Called by the PrerenderTracker when the swap failed.
  39   // May only be called if currently throttling the resource.
  40   void Resume();
  41
  42   // Called by the PrerenderTracker when the swap succeeded.
  43   // May only be called if currently throttling the resource.
  44   void Cancel();
  45
  46  private:
  47   net::URLRequest* request_;
  48   PrerenderTracker* tracker_;
  49   bool throttled_;
  50
  51   DISALLOW_COPY_AND_ASSIGN(PrerenderPendingSwapThrottle);
  52 };
  53
  54 }  // namespace prerender
  55
  56 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_PENDING_SWAP_THROTTLE_H_