Repo created

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

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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.
+
+#include "base/metrics/dummy_histogram.h"
+
+#include <memory>
+
+#include "base/logging.h"
+#include "base/metrics/histogram_samples.h"
+#include "base/metrics/metrics_hashes.h"
+
+namespace base {
+
+namespace {
+
+// Helper classes for DummyHistogram.
+class DummySampleCountIterator : public SampleCountIterator {
+ public:
+  DummySampleCountIterator() {}
+  ~DummySampleCountIterator() override {}
+
+  // 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();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DummySampleCountIterator);
+};
+
+class DummyHistogramSamples : public HistogramSamples {
+ public:
+  explicit DummyHistogramSamples() : HistogramSamples(0, new LocalMetadata()) {}
+  ~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;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DummyHistogramSamples);
+};
+
+}  // 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>();
+}
+
+}  // namespace base