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      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   virtual ~VisitedLinkEventListener();
     37 
     38   virtual void NewTable(base::SharedMemory* table_memory) OVERRIDE;
     39   virtual void Add(VisitedLinkMaster::Fingerprint fingerprint) OVERRIDE;
     40   virtual void Reset() OVERRIDE;
     41 
     42  private:
     43   void CommitVisitedLinks();
     44 
     45   // content::NotificationObserver implementation.
     46   virtual 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_
     71