components/visitedlink/browser/visitedlink_event_listener.h

   1 // Copyright (c) 2011 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 COMPONENTS_VISITEDLINK_BROWSER_VISITEDLINK_EVENT_LISTENER_H_
   6 #define COMPONENTS_VISITEDLINK_BROWSER_VISITEDLINK_EVENT_LISTENER_H_
   7
   8 #include <map>
   9
  10 #include "base/memory/linked_ptr.h"
  11 #include "base/timer/timer.h"
  12 #include "components/visitedlink/browser/visitedlink_master.h"
  13 #include "content/public/browser/notification_observer.h"
  14 #include "content/public/browser/notification_registrar.h"
  15
  16 namespace base {
  17 class SharedMemory;
  18 }
  19
  20 namespace content {
  21 class BrowserContext;
  22 }
  23
  24 namespace visitedlink {
  25
  26 class VisitedLinkUpdater;
  27
  28 // VisitedLinkEventListener broadcasts link coloring database updates to all
  29 // processes. It also coalesces the updates to avoid excessive broadcasting of
  30 // messages to the renderers.
  31 class VisitedLinkEventListener : public VisitedLinkMaster::Listener,
  32                                  public content::NotificationObserver {
  33  public:
  34   VisitedLinkEventListener(VisitedLinkMaster* master,
  35                            content::BrowserContext* browser_context);
  36   ~VisitedLinkEventListener() override;
  37
  38   void NewTable(base::SharedMemory* table_memory) override;
  39   void Add(VisitedLinkMaster::Fingerprint fingerprint) override;
  40   void Reset() override;
  41
  42  private:
  43   void CommitVisitedLinks();
  44
  45   // content::NotificationObserver implementation.
  46   void Observe(int type,
  47                const content::NotificationSource& source,
  48                const content::NotificationDetails& details) override;
  49
  50   base::OneShotTimer<VisitedLinkEventListener> coalesce_timer_;
  51   VisitedLinkCommon::Fingerprints pending_visited_links_;
  52
  53   content::NotificationRegistrar registrar_;
  54
  55   // Map between renderer child ids and their VisitedLinkUpdater.
  56   typedef std::map<int, linked_ptr<VisitedLinkUpdater> > Updaters;
  57   Updaters updaters_;
  58
  59   VisitedLinkMaster* master_;
  60
  61   // Used to filter RENDERER_PROCESS_CREATED notifications to renderers that
  62   // belong to this BrowserContext.
  63   content::BrowserContext* browser_context_;
  64
  65   DISALLOW_COPY_AND_ASSIGN(VisitedLinkEventListener);
  66 };
  67
  68 }  // namespace visitedlink
  69
  70 #endif  // COMPONENTS_VISITEDLINK_BROWSER_VISITEDLINK_EVENT_LISTENER_H_