Repo created

TMessagesProj/jni/voip/webrtc/base/metrics/dummy_histogram.h

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+// 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.
+
+#ifndef BASE_METRICS_DUMMY_HISTOGRAM_H_
+#define BASE_METRICS_DUMMY_HISTOGRAM_H_
+
+#include <stdint.h>
+
+#include <memory>
+#include <string>
+
+#include "base/base_export.h"
+#include "base/metrics/histogram_base.h"
+#include "base/no_destructor.h"
+
+namespace base {
+
+// DummyHistogram is used for mocking histogram objects for histograms that
+// shouldn't be recorded. It doesn't do any actual processing.
+class BASE_EXPORT DummyHistogram : public HistogramBase {
+ public:
+  static DummyHistogram* GetInstance();
+
+  // HistogramBase:
+  void CheckName(const StringPiece& name) const override {}
+  uint64_t name_hash() const override;
+  HistogramType GetHistogramType() const override;
+  bool HasConstructionArguments(Sample expected_minimum,
+                                Sample expected_maximum,
+                                uint32_t expected_bucket_count) const override;
+  void Add(Sample value) override {}
+  void AddCount(Sample value, int count) override {}
+  void AddSamples(const HistogramSamples& samples) override {}
+  bool AddSamplesFromPickle(PickleIterator* iter) override;
+  std::unique_ptr<HistogramSamples> SnapshotSamples() const override;
+  std::unique_ptr<HistogramSamples> SnapshotDelta() override;
+  std::unique_ptr<HistogramSamples> SnapshotFinalDelta() const override;
+  void WriteHTMLGraph(std::string* output) const override {}
+  void WriteAscii(std::string* output) const override {}
+
+ protected:
+  // HistogramBase:
+  void SerializeInfoImpl(Pickle* pickle) const override {}
+  void GetParameters(DictionaryValue* params) const override {}
+  void GetCountAndBucketData(Count* count,
+                             int64_t* sum,
+                             ListValue* buckets) const override {}
+
+ private:
+  friend class NoDestructor<DummyHistogram>;
+
+  DummyHistogram() : HistogramBase("dummy_histogram") {}
+  ~DummyHistogram() override {}
+
+  DISALLOW_COPY_AND_ASSIGN(DummyHistogram);
+};
+
+}  // namespace base
+
+#endif  // BASE_METRICS_DUMMY_HISTOGRAM_H_