109 lines
4.0 KiB
C
109 lines
4.0 KiB
C
|
// 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.
|
||
|
|
|
||
|
|
// StatisticsRecorder holds all Histograms and BucketRanges that are used by
|
||
|
|
// Histograms in the system. It provides a general place for
|
||
|
|
// Histograms/BucketRanges to register, and supports a global API for accessing
|
||
|
|
// (i.e., dumping, or graphing) the data.
|
||
|
|
|
||
|
|
#ifndef BASE_METRICS_STATISTICS_RECORDER_H_
|
||
|
|
#define BASE_METRICS_STATISTICS_RECORDER_H_
|
||
|
|
|
||
|
|
#include <list>
|
||
|
|
#include <map>
|
||
|
|
#include <string>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
#include "base/base_export.h"
|
||
|
|
#include "base/basictypes.h"
|
||
|
|
#include "base/gtest_prod_util.h"
|
||
|
|
#include "base/lazy_instance.h"
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
|
||
|
|
class BucketRanges;
|
||
|
|
class HistogramBase;
|
||
|
|
class Lock;
|
||
|
|
|
||
|
|
class BASE_EXPORT StatisticsRecorder {
|
||
|
|
public:
|
||
|
|
typedef std::vector<HistogramBase*> Histograms;
|
||
|
|
|
||
|
|
// Initializes the StatisticsRecorder system.
|
||
|
|
static void Initialize();
|
||
|
|
|
||
|
|
// 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 HistogramBase* RegisterOrDeleteDuplicate(HistogramBase* histogram);
|
||
|
|
|
||
|
|
// Register, or add a new BucketRanges. If an identically BucketRanges is
|
||
|
|
// already registered, then the argument |ranges| will deleted. The returned
|
||
|
|
// value is always the registered BucketRanges (either the argument, or the
|
||
|
|
// pre-existing one).
|
||
|
|
static const BucketRanges* RegisterOrDeleteDuplicateRanges(
|
||
|
|
const BucketRanges* ranges);
|
||
|
|
|
||
|
|
// 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);
|
||
|
|
|
||
|
|
// Method for extracting BucketRanges used by all histograms registered.
|
||
|
|
static void GetBucketRanges(std::vector<const BucketRanges*>* output);
|
||
|
|
|
||
|
|
// Find a histogram by name. It matches the exact name. This method is thread
|
||
|
|
// safe. It returns NULL if a matching histogram is not found.
|
||
|
|
static HistogramBase* FindHistogram(const std::string& name);
|
||
|
|
|
||
|
|
// 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, HistogramBase*> HistogramMap;
|
||
|
|
|
||
|
|
// We keep all |bucket_ranges_| in a map, from checksum to a list of
|
||
|
|
// |bucket_ranges_|. Checksum is calculated from the |ranges_| in
|
||
|
|
// |bucket_ranges_|.
|
||
|
|
typedef std::map<uint32, std::list<const BucketRanges*>*> RangesMap;
|
||
|
|
|
||
|
|
friend struct DefaultLazyInstanceTraits<StatisticsRecorder>;
|
||
|
|
friend class HistogramBaseTest;
|
||
|
|
friend class HistogramTest;
|
||
|
|
friend class SparseHistogramTest;
|
||
|
|
friend class StatisticsRecorderTest;
|
||
|
|
|
||
|
|
// The constructor just initializes static members. Usually client code should
|
||
|
|
// use Initialize to do this. But in test code, you can friend this class and
|
||
|
|
// call destructor/constructor to get a clean StatisticsRecorder.
|
||
|
|
StatisticsRecorder();
|
||
|
|
~StatisticsRecorder();
|
||
|
|
|
||
|
|
static void DumpHistogramsToVlog(void* instance);
|
||
|
|
|
||
|
|
static HistogramMap* histograms_;
|
||
|
|
static RangesMap* ranges_;
|
||
|
|
|
||
|
|
// Lock protects access to above maps.
|
||
|
|
static base::Lock* lock_;
|
||
|
|
|
||
|
|
DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace base
|
||
|
|
|
||
|
|
#endif // BASE_METRICS_STATISTICS_RECORDER_H_
|