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      1 // Copyright (c) 2010 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 // VisitedLinkEventListener broadcasts link coloring database updates to all
      6 // processes. It also coalesces the updates to avoid excessive broadcasting of
      7 // messages to the renderers.
      8 
      9 #ifndef CHROME_BROWSER_VISITEDLINK_VISITEDLINK_EVENT_LISTENER_H_
     10 #define CHROME_BROWSER_VISITEDLINK_VISITEDLINK_EVENT_LISTENER_H_
     11 #pragma once
     12 
     13 #include "base/timer.h"
     14 #include "chrome/browser/visitedlink/visitedlink_master.h"
     15 
     16 namespace base {
     17 class SharedMemory;
     18 }
     19 
     20 class VisitedLinkEventListener : public VisitedLinkMaster::Listener {
     21  public:
     22   VisitedLinkEventListener();
     23   virtual ~VisitedLinkEventListener();
     24 
     25   virtual void NewTable(base::SharedMemory* table_memory);
     26   virtual void Add(VisitedLinkMaster::Fingerprint fingerprint);
     27   virtual void Reset();
     28 
     29  private:
     30   void CommitVisitedLinks();
     31 
     32   base::OneShotTimer<VisitedLinkEventListener> coalesce_timer_;
     33   VisitedLinkCommon::Fingerprints pending_visited_links_;
     34 
     35   DISALLOW_COPY_AND_ASSIGN(VisitedLinkEventListener);
     36 };
     37 
     38 #endif  // CHROME_BROWSER_VISITEDLINK_VISITEDLINK_EVENT_LISTENER_H_
     39