62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
// Copyright 2014 The Chromium Authors
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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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#include "components/metrics/library_support/histogram_manager.h"
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#include <string>
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#include <vector>
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#include "base/lazy_instance.h"
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#include "base/metrics/histogram_macros.h"
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#include "base/metrics/histogram_samples.h"
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#include "base/metrics/statistics_recorder.h"
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#include "base/thread_annotations.h"
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#include "components/metrics/histogram_encoder.h"
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namespace metrics {
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// TODO(rtenneti): move g_histogram_manager into java code.
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static base::LazyInstance<HistogramManager>::Leaky g_histogram_manager =
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LAZY_INSTANCE_INITIALIZER;
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HistogramManager::HistogramManager() : histogram_snapshot_manager_(this) {}
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HistogramManager::~HistogramManager() {}
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// static
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HistogramManager* HistogramManager::GetInstance() {
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return g_histogram_manager.Pointer();
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}
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void HistogramManager::RecordDelta(const base::HistogramBase& histogram,
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const base::HistogramSamples& snapshot) {
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EncodeHistogramDelta(histogram.histogram_name(), snapshot, &uma_proto_);
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}
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// TODO(lukasza): https://crbug.com/881903: NO_THREAD_SAFETY_ANALYSIS below can
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// be removed once base::Lock::Try is annotated with EXCLUSIVE_TRYLOCK_FUNCTION.
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bool HistogramManager::GetDeltas(std::vector<uint8_t>* data)
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NO_THREAD_SAFETY_ANALYSIS {
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if (get_deltas_lock_.Try()) {
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base::AutoLock lock(get_deltas_lock_, base::AutoLock::AlreadyAcquired());
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// Clear the protobuf between calls.
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uma_proto_.Clear();
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// "false" indicates to *not* include histograms held in persistent storage
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// on the assumption that they will be visible to the recipient through
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// other means.
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base::StatisticsRecorder::PrepareDeltas(
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false, base::Histogram::kNoFlags,
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base::Histogram::kUmaTargetedHistogramFlag,
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&histogram_snapshot_manager_);
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int32_t data_size = uma_proto_.ByteSize();
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data->resize(data_size);
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if (data_size == 0 || uma_proto_.SerializeToArray(data->data(), data_size))
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return true;
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}
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data->clear();
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return false;
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}
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} // namespace metrics
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