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