chrome_frame/chrome_frame_histograms.h

   1 // Copyright (c) 2009 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 CHROME_FRAME_HISTOGRAM_SNAPSHOTS_H_
   6 #define CHROME_FRAME_HISTOGRAM_SNAPSHOTS_H_
   7
   8 #include <map>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "base/histogram.h"
  14 #include "base/process.h"
  15 #include "base/scoped_ptr.h"
  16 #include "base/task.h"
  17
  18 // This class gathers histogram data in the host browser process and
  19 // serializes the data into a vector of strings to be uploaded to the
  20 // Chrome browser process. It records the histogram data which has been
  21 // logged and only uploads the delta with the next log.
  22 // TODO(iyengar)
  23 // This class does not contain any ChromeFrame specific stuff. It should
  24 // be moved to base.
  25 class ChromeFrameHistogramSnapshots {
  26  public:
  27   // Maintain a map of histogram names to the sample stats we've sent.
  28   typedef std::map<std::string, Histogram::SampleSet> LoggedSampleMap;
  29   typedef std::vector<std::string> HistogramPickledList;
  30
  31   ChromeFrameHistogramSnapshots();
  32   ~ChromeFrameHistogramSnapshots() {}
  33
  34   // Extract snapshot data and return it to be sent off to the Chrome browser
  35   // process.
  36   // Return only a delta to what we have already sent.
  37   HistogramPickledList GatherAllHistograms();
  38
  39  private:
  40   void GatherHistogram(const Histogram& histogram,
  41                        HistogramPickledList* histograms);
  42
  43   void GatherHistogramDelta(const Histogram& histogram,
  44                             const Histogram::SampleSet& snapshot,
  45                             HistogramPickledList* histograms);
  46
  47   // For histograms, record what we've already logged (as a sample for each
  48   // histogram) so that we can send only the delta with the next log.
  49   LoggedSampleMap logged_samples_;
  50
  51   // Synchronizes the histogram gathering operation.
  52   Lock lock_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(ChromeFrameHistogramSnapshots);
  55 };
  56
  57 #endif  // CHROME_RENDERER_HISTOGRAM_SNAPSHOTS_H_