blob: a2380351585ba74f3a458502bb7adecedac393eb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
// Copyright 2017 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.
#include "base/metrics/dummy_histogram.h"
#include <memory>
#include "base/metrics/histogram_samples.h"
#include "base/metrics/metrics_hashes.h"
#include "base/notreached.h"
#include "base/values.h"
namespace base {
namespace {
// Helper classes for DummyHistogram.
class DummySampleCountIterator : public SampleCountIterator {
public:
DummySampleCountIterator() = default;
DummySampleCountIterator(const DummySampleCountIterator&) = delete;
DummySampleCountIterator& operator=(const DummySampleCountIterator&) = delete;
~DummySampleCountIterator() override = default;
// SampleCountIterator:
bool Done() const override { return true; }
void Next() override { NOTREACHED(); }
void Get(HistogramBase::Sample* min,
int64_t* max,
HistogramBase::Count* count) const override {
NOTREACHED();
}
};
class DummyHistogramSamples : public HistogramSamples {
public:
DummyHistogramSamples() : HistogramSamples(0, new LocalMetadata()) {}
DummyHistogramSamples(const DummyHistogramSamples&) = delete;
DummyHistogramSamples& operator=(const DummyHistogramSamples&) = delete;
~DummyHistogramSamples() override {
delete static_cast<LocalMetadata*>(meta());
}
// HistogramSamples:
void Accumulate(HistogramBase::Sample value,
HistogramBase::Count count) override {}
HistogramBase::Count GetCount(HistogramBase::Sample value) const override {
return HistogramBase::Count();
}
HistogramBase::Count TotalCount() const override {
return HistogramBase::Count();
}
std::unique_ptr<SampleCountIterator> Iterator() const override {
return std::make_unique<DummySampleCountIterator>();
}
bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override {
return true;
}
};
} // namespace
// static
DummyHistogram* DummyHistogram::GetInstance() {
static base::NoDestructor<DummyHistogram> dummy_histogram;
return dummy_histogram.get();
}
uint64_t DummyHistogram::name_hash() const {
return HashMetricName(histogram_name());
}
HistogramType DummyHistogram::GetHistogramType() const {
return DUMMY_HISTOGRAM;
}
bool DummyHistogram::HasConstructionArguments(
Sample expected_minimum,
Sample expected_maximum,
uint32_t expected_bucket_count) const {
return true;
}
bool DummyHistogram::AddSamplesFromPickle(PickleIterator* iter) {
return true;
}
std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotSamples() const {
return std::make_unique<DummyHistogramSamples>();
}
std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotDelta() {
return std::make_unique<DummyHistogramSamples>();
}
std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotFinalDelta() const {
return std::make_unique<DummyHistogramSamples>();
}
base::DictionaryValue DummyHistogram::ToGraphDict() const {
return base::DictionaryValue();
}
} // namespace base
|
