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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_RENDERER_VISITEDLINK_SLAVE_H_
      6 #define COMPONENTS_VISITEDLINK_RENDERER_VISITEDLINK_SLAVE_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "base/memory/shared_memory.h"
     10 #include "components/visitedlink/common/visitedlink_common.h"
     11 #include "content/public/renderer/render_process_observer.h"
     12 
     13 namespace visitedlink {
     14 
     15 // Reads the link coloring database provided by the master. There can be any
     16 // number of slaves reading the same database.
     17 class VisitedLinkSlave : public VisitedLinkCommon,
     18                          public content::RenderProcessObserver {
     19  public:
     20   VisitedLinkSlave();
     21   virtual ~VisitedLinkSlave();
     22 
     23   // RenderProcessObserver implementation.
     24   virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
     25 
     26   // Message handlers.
     27   void OnUpdateVisitedLinks(base::SharedMemoryHandle table);
     28   void OnAddVisitedLinks(const VisitedLinkSlave::Fingerprints& fingerprints);
     29   void OnResetVisitedLinks();
     30 
     31  private:
     32   void FreeTable();
     33 
     34   // shared memory consists of a SharedHeader followed by the table
     35   base::SharedMemory* shared_memory_;
     36 
     37   DISALLOW_COPY_AND_ASSIGN(VisitedLinkSlave);
     38 };
     39 
     40 }  // namespace visitedlink
     41 
     42 #endif  // COMPONENTS_VISITEDLINK_RENDERER_VISITEDLINK_SLAVE_H_
     43