child_histogram_message_filter.h revision 5c02ac1a9c1b504631c0a3d2b6e737b5d738bae1 
1// Copyright (c) 2012 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 CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_
6#define CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_
7
8#include <string>
9#include <vector>
10
11#include "base/basictypes.h"
12#include "base/memory/scoped_ptr.h"
13#include "ipc/message_filter.h"
14
15namespace base {
16class HistogramDeltaSerialization;
17class MessageLoopProxy;
18}  // namespace base
19
20namespace content {
21
22class ChildHistogramMessageFilter : public IPC::MessageFilter {
23 public:
24  ChildHistogramMessageFilter();
25
26  // IPC::MessageFilter implementation.
27  virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
28  virtual void OnFilterRemoved() OVERRIDE;
29  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
30
31  void SendHistograms(int sequence_number);
32
33 private:
34  typedef std::vector<std::string> HistogramPickledList;
35
36  virtual ~ChildHistogramMessageFilter();
37
38  // Message handlers.
39  virtual void OnGetChildHistogramData(int sequence_number);
40
41  // Extract snapshot data and then send it off the the Browser process.
42  // Send only a delta to what we have already sent.
43  void UploadAllHistograms(int sequence_number);
44
45  IPC::Channel* channel_;
46
47  scoped_refptr<base::MessageLoopProxy> io_message_loop_;
48
49  // Prepares histogram deltas for transmission.
50  scoped_ptr<base::HistogramDeltaSerialization> histogram_delta_serialization_;
51
52  DISALLOW_COPY_AND_ASSIGN(ChildHistogramMessageFilter);
53};
54
55}  // namespace content
56
57#endif  // CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_
58