net/disk_cache/stats_histogram.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 NET_DISK_CACHE_STATS_HISTOGRAM_H_
   6 #define NET_DISK_CACHE_STATS_HISTOGRAM_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/metrics/histogram.h"
  12
  13 namespace base {
  14 class BucketRanges;
  15 class HistogramSamples;
  16 class SampleVector;
  17 }  // namespace base
  18
  19 namespace disk_cache {
  20
  21 class Stats;
  22
  23 // This class provides support for sending the disk cache size stats as a UMA
  24 // histogram. We'll provide our own storage and management for the data, and a
  25 // SampleVector with a copy of our data.
  26 //
  27 // Class derivation of Histogram "deprecated," and should not be copied, and
  28 // may eventually go away.
  29 //
  30 class StatsHistogram : public base::Histogram {
  31  public:
  32   StatsHistogram(const std::string& name,
  33                  Sample minimum,
  34                  Sample maximum,
  35                  const base::BucketRanges* ranges,
  36                  const Stats* stats);
  37   virtual ~StatsHistogram();
  38
  39   static void InitializeBucketRanges(const Stats* stats,
  40                                      base::BucketRanges* ranges);
  41   static StatsHistogram* FactoryGet(const std::string& name,
  42                                     const Stats* stats);
  43
  44   // Disables this histogram when the underlying Stats go away.
  45   void Disable();
  46
  47   virtual scoped_ptr<base::HistogramSamples> SnapshotSamples() const OVERRIDE;
  48   virtual int FindCorruption(
  49       const base::HistogramSamples& samples) const OVERRIDE;
  50
  51  private:
  52   const Stats* stats_;
  53   DISALLOW_COPY_AND_ASSIGN(StatsHistogram);
  54 };
  55
  56 }  // namespace disk_cache
  57
  58 #endif  // NET_DISK_CACHE_STATS_HISTOGRAM_H_