src/content/child/child_histogram_message_filter.h

   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
  15 namespace base {
  16 class HistogramDeltaSerialization;
  17 class MessageLoopProxy;
  18 }  // namespace base
  19
  20 namespace content {
  21
  22 class 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_