62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
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// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_METRICS_DUMMY_HISTOGRAM_H_
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#define BASE_METRICS_DUMMY_HISTOGRAM_H_
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#include <stdint.h>
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#include <memory>
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#include <string>
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#include "base/base_export.h"
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#include "base/metrics/histogram_base.h"
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#include "base/no_destructor.h"
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namespace base {
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// DummyHistogram is used for mocking histogram objects for histograms that
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// shouldn't be recorded. It doesn't do any actual processing.
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class BASE_EXPORT DummyHistogram : public HistogramBase {
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public:
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static DummyHistogram* GetInstance();
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// HistogramBase:
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void CheckName(const StringPiece& name) const override {}
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uint64_t name_hash() const override;
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HistogramType GetHistogramType() const override;
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bool HasConstructionArguments(Sample expected_minimum,
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Sample expected_maximum,
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uint32_t expected_bucket_count) const override;
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void Add(Sample value) override {}
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void AddCount(Sample value, int count) override {}
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void AddSamples(const HistogramSamples& samples) override {}
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bool AddSamplesFromPickle(PickleIterator* iter) override;
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std::unique_ptr<HistogramSamples> SnapshotSamples() const override;
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std::unique_ptr<HistogramSamples> SnapshotDelta() override;
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std::unique_ptr<HistogramSamples> SnapshotFinalDelta() const override;
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void WriteHTMLGraph(std::string* output) const override {}
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void WriteAscii(std::string* output) const override {}
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protected:
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// HistogramBase:
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void SerializeInfoImpl(Pickle* pickle) const override {}
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void GetParameters(DictionaryValue* params) const override {}
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void GetCountAndBucketData(Count* count,
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int64_t* sum,
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ListValue* buckets) const override {}
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private:
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friend class NoDestructor<DummyHistogram>;
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DummyHistogram() : HistogramBase("dummy_histogram") {}
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~DummyHistogram() override {}
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DISALLOW_COPY_AND_ASSIGN(DummyHistogram);
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};
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} // namespace base
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#endif // BASE_METRICS_DUMMY_HISTOGRAM_H_
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