content/browser/cross_site_request_manager.h

   1 // Copyright (c) 2012 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_CROSS_SITE_REQUEST_MANAGER_H_
   6 #define CONTENT_BROWSER_CROSS_SITE_REQUEST_MANAGER_H_
   7
   8 #include <set>
   9 #include <utility>
  10
  11 #include "base/basictypes.h"
  12 #include "base/synchronization/lock.h"
  13
  14 template <typename T> struct DefaultSingletonTraits;
  15
  16 namespace content {
  17
  18 // CrossSiteRequestManager is used to handle bookkeeping for cross-site
  19 // requests and responses between the UI and IO threads.  Such requests involve
  20 // a transition from one RenderViewHost to another within WebContentsImpl, and
  21 // involve coordination with ResourceDispatcherHost.
  22 //
  23 // CrossSiteRequestManager is a singleton that may be used on any thread.
  24 //
  25 class CrossSiteRequestManager {
  26  public:
  27   // Returns the singleton instance.
  28   static CrossSiteRequestManager* GetInstance();
  29
  30   // Returns whether the RenderViewHost specified by the given IDs currently
  31   // has a pending cross-site request.  If so, we will have to delay the
  32   // response until the previous RenderViewHost runs its onunload handler.
  33   // Called by ResourceDispatcherHost on the IO thread and RenderViewHost on
  34   // the UI thread.
  35   bool HasPendingCrossSiteRequest(int renderer_id, int render_view_id);
  36
  37   // Sets whether the RenderViewHost specified by the given IDs currently has a
  38   // pending cross-site request.  Called by RenderViewHost on the UI thread.
  39   void SetHasPendingCrossSiteRequest(int renderer_id,
  40                                      int render_view_id,
  41                                      bool has_pending);
  42
  43  private:
  44   friend struct DefaultSingletonTraits<CrossSiteRequestManager>;
  45   typedef std::set<std::pair<int, int> > RenderViewSet;
  46
  47   CrossSiteRequestManager();
  48   ~CrossSiteRequestManager();
  49
  50   // You must acquire this lock before reading or writing any members of this
  51   // class.  You must not block while holding this lock.
  52   base::Lock lock_;
  53
  54   // Set of (render_process_host_id, render_view_id) pairs of all
  55   // RenderViewHosts that have pending cross-site requests.  Used to pass
  56   // information about the RenderViewHosts between the UI and IO threads.
  57   RenderViewSet pending_cross_site_views_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(CrossSiteRequestManager);
  60 };
  61
  62 }  // namespace content
  63
  64 #endif  // CONTENT_BROWSER_CROSS_SITE_REQUEST_MANAGER_H_