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.
5 #ifndef BASE_METRICS_SPARSE_HISTOGRAM_H_
6 #define BASE_METRICS_SPARSE_HISTOGRAM_H_
11 #include "base/base_export.h"
12 #include "base/basictypes.h"
13 #include "base/compiler_specific.h"
14 #include "base/logging.h"
15 #include "base/memory/scoped_ptr.h"
16 #include "base/metrics/histogram_base.h"
17 #include "base/metrics/sample_map.h"
18 #include "base/synchronization/lock.h"
22 #define UMA_HISTOGRAM_SPARSE_SLOWLY(name, sample) \
24 base::HistogramBase* histogram = base::SparseHistogram::FactoryGet( \
25 name, base::HistogramBase::kUmaTargetedHistogramFlag); \
26 histogram->Add(sample); \
29 class HistogramSamples
;
31 class BASE_EXPORT_PRIVATE SparseHistogram
: public HistogramBase
{
33 // If there's one with same name, return the existing one. If not, create a
35 static HistogramBase
* FactoryGet(const std::string
& name
, int32 flags
);
37 virtual ~SparseHistogram();
39 // HistogramBase implementation:
40 virtual HistogramType
GetHistogramType() const OVERRIDE
;
41 virtual bool HasConstructionArguments(
42 Sample expected_minimum
,
43 Sample expected_maximum
,
44 size_t expected_bucket_count
) const OVERRIDE
;
45 virtual void Add(Sample value
) OVERRIDE
;
46 virtual void AddSamples(const HistogramSamples
& samples
) OVERRIDE
;
47 virtual bool AddSamplesFromPickle(PickleIterator
* iter
) OVERRIDE
;
48 virtual scoped_ptr
<HistogramSamples
> SnapshotSamples() const OVERRIDE
;
49 virtual void WriteHTMLGraph(std::string
* output
) const OVERRIDE
;
50 virtual void WriteAscii(std::string
* output
) const OVERRIDE
;
53 // HistogramBase implementation:
54 virtual bool SerializeInfoImpl(Pickle
* pickle
) const OVERRIDE
;
57 // Clients should always use FactoryGet to create SparseHistogram.
58 explicit SparseHistogram(const std::string
& name
);
60 friend BASE_EXPORT_PRIVATE HistogramBase
* DeserializeHistogramInfo(
61 PickleIterator
* iter
);
62 static HistogramBase
* DeserializeInfoImpl(PickleIterator
* iter
);
64 virtual void GetParameters(DictionaryValue
* params
) const OVERRIDE
;
65 virtual void GetCountAndBucketData(Count
* count
,
67 ListValue
* buckets
) const OVERRIDE
;
69 // Helpers for emitting Ascii graphic. Each method appends data to output.
70 void WriteAsciiImpl(bool graph_it
,
71 const std::string
& newline
,
72 std::string
* output
) const;
74 // Write a common header message describing this histogram.
75 void WriteAsciiHeader(const Count total_count
,
76 std::string
* output
) const;
78 // For constuctor calling.
79 friend class SparseHistogramTest
;
81 // Protects access to |samples_|.
82 mutable base::Lock lock_
;
86 DISALLOW_COPY_AND_ASSIGN(SparseHistogram
);
91 #endif // BASE_METRICS_SPARSE_HISTOGRAM_H_