text: // Copyright (c) 2011 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef CHROME_RENDERER_VISITEDLINK_SLAVE_H_
  #define CHROME_RENDERER_VISITEDLINK_SLAVE_H_
  
  #include "base/compiler_specific.h"
  #include "base/shared_memory.h"
  #include "chrome/common/visitedlink_common.h"
  #include "content/public/renderer/render_process_observer.h"
  
  // Reads the link coloring database provided by the master. There can be any
  // number of slaves reading the same database.
  class VisitedLinkSlave : public VisitedLinkCommon,
                           public content::RenderProcessObserver {
   public:
    VisitedLinkSlave();
    virtual ~VisitedLinkSlave();
  
    // RenderProcessObserver implementation.
    virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
  
    // Message handlers.
    void OnUpdateVisitedLinks(base::SharedMemoryHandle table);
    void OnAddVisitedLinks(const VisitedLinkSlave::Fingerprints& fingerprints);
    void OnResetVisitedLinks();
   private:
    void FreeTable();
  
    // shared memory consists of a SharedHeader followed by the table
    base::SharedMemory* shared_memory_;
  
    DISALLOW_COPY_AND_ASSIGN(VisitedLinkSlave);
  };
  
  #endif  // CHROME_RENDERER_VISITEDLINK_SLAVE_H_
  