components/visitedlink/renderer/visitedlink_slave.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_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   ~VisitedLinkSlave() override;
  22
  23   // RenderProcessObserver implementation.
  24   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_