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- // Copyright 2014 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 "components/metrics/histogram_encoder.h"
- #include <memory>
- #include <string>
- #include "base/metrics/histogram.h"
- #include "base/metrics/histogram_samples.h"
- #include "base/metrics/metrics_hashes.h"
- using base::SampleCountIterator;
- namespace metrics {
- void EncodeHistogramDelta(const std::string& histogram_name,
- const base::HistogramSamples& snapshot,
- ChromeUserMetricsExtension* uma_proto) {
- DCHECK_NE(0, snapshot.TotalCount());
- DCHECK(uma_proto);
- // We will ignore the MAX_INT/infinite value in the last element of range[].
- HistogramEventProto* histogram_proto = uma_proto->add_histogram_event();
- histogram_proto->set_name_hash(base::HashMetricName(histogram_name));
- if (snapshot.sum() != 0)
- histogram_proto->set_sum(snapshot.sum());
- for (std::unique_ptr<SampleCountIterator> it = snapshot.Iterator();
- !it->Done(); it->Next()) {
- base::Histogram::Sample min;
- int64_t max;
- base::Histogram::Count count;
- it->Get(&min, &max, &count);
- HistogramEventProto::Bucket* bucket = histogram_proto->add_bucket();
- bucket->set_min(min);
- bucket->set_max(max);
- // Note: The default for count is 1 in the proto, so omit it in that case.
- if (count != 1)
- bucket->set_count(count);
- }
- // Omit fields to save space (see rules in histogram_event.proto comments).
- for (int i = 0; i < histogram_proto->bucket_size(); ++i) {
- HistogramEventProto::Bucket* bucket = histogram_proto->mutable_bucket(i);
- if (i + 1 < histogram_proto->bucket_size() &&
- bucket->max() == histogram_proto->bucket(i + 1).min()) {
- bucket->clear_max();
- } else if (bucket->max() == bucket->min() + 1) {
- bucket->clear_min();
- }
- }
- }
- } // namespace metrics
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