Move StatisticsRecorder out of histogram.cc/h for further refactoring.

base/metrics/histogram.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Histogram is an object that aggregates statistics, and can summarize them in
 // various forms, including ASCII graphical, HTML, and numerically (as a
 // vector of numbers corresponding to each of the aggregating buckets).
 
 // It supports calls to accumulate either time intervals (which are processed
 // as integral number of milliseconds), or arbitrary integral units.
@@ skipping 22 matching lines @@
 // that detects a uninitialized (NULL) pointer.  The potentially racy
 // initialization is not a problem as it is always set to point to the same
 // value (i.e., the FactoryGet always returns the same value).  FactoryGet
 // is also completely thread safe, which results in a completely thread safe,
 // and relatively fast, set of counters.  To avoid races at shutdown, the static
 // pointer is NOT deleted, and we leak the histograms at process termination.
 
 #ifndef BASE_METRICS_HISTOGRAM_H_
 #define BASE_METRICS_HISTOGRAM_H_
 
-#include <list>
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/atomicops.h"
 #include "base/base_export.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/logging.h"
 #include "base/time.h"
@@ skipping 713 matching lines @@
 
   virtual bool SerializeRanges(Pickle* pickle) const OVERRIDE;
 
   // Initialize ranges_ mapping in cached_ranges_.
   void InitializedCustomBucketRange(const std::vector<Sample>& custom_ranges);
   virtual double GetBucketSize(Count current, size_t i) const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(CustomHistogram);
 };
 
-//------------------------------------------------------------------------------
-// StatisticsRecorder handles all histograms in the system.  It provides a
-// general place for histograms to register, and supports a global API for
-// accessing (i.e., dumping, or graphing) the data in all the histograms.
-
-class BASE_EXPORT StatisticsRecorder {
- public:
-  typedef std::vector<Histogram*> Histograms;
-
-  StatisticsRecorder();
-
-  ~StatisticsRecorder();
-
-  // Find out if histograms can now be registered into our list.
-  static bool IsActive();
-
-  // Register, or add a new histogram to the collection of statistics. If an
-  // identically named histogram is already registered, then the argument
-  // |histogram| will deleted.  The returned value is always the registered
-  // histogram (either the argument, or the pre-existing registered histogram).
-  static Histogram* RegisterOrDeleteDuplicate(Histogram* histogram);
-
-  // Register, or add a new cached_ranges_ of |histogram|. If an identical
-  // cached_ranges_ is already registered, then the cached_ranges_ of
-  // |histogram| is deleted and the |histogram|'s cached_ranges_ is reset to the
-  // registered cached_ranges_.  The cached_ranges_ of |histogram| is always the
-  // registered CachedRanges (either the argument's cached_ranges_, or the
-  // pre-existing registered cached_ranges_).
-  static void RegisterOrDeleteDuplicateRanges(Histogram* histogram);
-
-  // Method for collecting stats about histograms created in browser and
-  // renderer processes. |suffix| is appended to histogram names. |suffix| could
-  // be either browser or renderer.
-  static void CollectHistogramStats(const std::string& suffix);
-
-  // Methods for printing histograms.  Only histograms which have query as
-  // a substring are written to output (an empty string will process all
-  // registered histograms).
-  static void WriteHTMLGraph(const std::string& query, std::string* output);
-  static void WriteGraph(const std::string& query, std::string* output);
-
-  // Method for extracting histograms which were marked for use by UMA.
-  static void GetHistograms(Histograms* output);
-
-  // Find a histogram by name. It matches the exact name. This method is thread
-  // safe.  If a matching histogram is not found, then the |histogram| is
-  // not changed.
-  static bool FindHistogram(const std::string& query, Histogram** histogram);
-
-  static bool dump_on_exit() { return dump_on_exit_; }
-
-  static void set_dump_on_exit(bool enable) { dump_on_exit_ = enable; }
-
-  // GetSnapshot copies some of the pointers to registered histograms into the
-  // caller supplied vector (Histograms).  Only histograms with names matching
-  // query are returned. The query must be a substring of histogram name for its
-  // pointer to be copied.
-  static void GetSnapshot(const std::string& query, Histograms* snapshot);
-
-
- private:
-  // We keep all registered histograms in a map, from name to histogram.
-  typedef std::map<std::string, Histogram*> HistogramMap;
-
-  // We keep all |cached_ranges_| in a map, from checksum to a list of
-  // |cached_ranges_|.  Checksum is calculated from the |ranges_| in
-  // |cached_ranges_|.
-  typedef std::map<uint32, std::list<CachedRanges*>*> RangesMap;
-
-  static HistogramMap* histograms_;
-
-  static RangesMap* ranges_;
-
-  // lock protects access to the above map.
-  static base::Lock* lock_;
-
-  // Dump all known histograms to log.
-  static bool dump_on_exit_;
-
-  DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder);
-};
-
-//------------------------------------------------------------------------------
-
 // CachedRanges stores the Ranges vector. Histograms that have same Ranges
 // vector will use the same CachedRanges object.
 class BASE_EXPORT CachedRanges {
  public:
   typedef std::vector<Histogram::Sample> Ranges;
 
   CachedRanges(size_t bucket_count, int initial_value);
   ~CachedRanges();
 
   //----------------------------------------------------------------------------
@@ skipping 21 matching lines @@
   // of our data, and to quickly see if some other CachedRanges instance is
   // possibly Equal() to this instance.
   uint32 range_checksum_;
 
   DISALLOW_COPY_AND_ASSIGN(CachedRanges);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_HISTOGRAM_H_