content/browser/transition_request_manager.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 CONTENT_BROWSER_TRANSITION_REQUEST_MANAGER_H_
   6 #define CONTENT_BROWSER_TRANSITION_REQUEST_MANAGER_H_
   7
   8 #include <set>
   9 #include <utility>
  10
  11 #include "base/basictypes.h"
  12 #include "content/common/content_export.h"
  13
  14 template <typename T>
  15 struct DefaultSingletonTraits;
  16
  17 namespace content {
  18
  19 // TransitionRequestManager is used to handle bookkeeping for transition
  20 // requests and responses.
  21 //
  22 // TransitionRequestManager is a singleton and should only be accessed on the IO
  23 // thread.
  24 //
  25 class TransitionRequestManager {
  26  public:
  27   // Returns the singleton instance.
  28   CONTENT_EXPORT static TransitionRequestManager* GetInstance();
  29
  30   // Returns whether the RenderFrameHost specified by the given IDs currently
  31   // has a pending transition request. If so, we will have to delay the
  32   // response until the embedder resumes the request.
  33   bool HasPendingTransitionRequest(int process_id, int render_frame_id);
  34
  35   // Sets whether the RenderFrameHost specified by the given IDs currently has a
  36   // pending transition request.
  37   CONTENT_EXPORT void SetHasPendingTransitionRequest(int process_id,
  38                                                      int render_frame_id,
  39                                                      bool has_pending);
  40
  41  private:
  42   friend struct DefaultSingletonTraits<TransitionRequestManager>;
  43   typedef std::set<std::pair<int, int> > RenderFrameSet;
  44
  45   TransitionRequestManager();
  46   ~TransitionRequestManager();
  47
  48   // Set of (render_process_host_id, render_frame_id) pairs of all
  49   // RenderFrameHosts that have pending transition requests. Used to pass
  50   // information to the CrossSiteResourceHandler without doing a round-trip
  51   // between IO->UI->IO threads.
  52   RenderFrameSet pending_transition_frames_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(TransitionRequestManager);
  55 };
  56
  57 }  // namespace content
  58
  59 #endif  // CONTENT_BROWSER_TRANSITION_REQUEST_MANAGER_H_