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
13namespace visitedlink {
14
15// Reads the link coloring database provided by the master. There can be any
16// number of slaves reading the same database.
17class 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