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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/cronet/histogram_manager.h"
#include <string>
#include <vector>
#include "base/lazy_instance.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/histogram_samples.h"
#include "base/metrics/statistics_recorder.h"
#include "components/metrics/histogram_encoder.h"
namespace cronet {
// TODO(rtenneti): move g_histogram_manager into java code.
static base::LazyInstance<HistogramManager>::Leaky
g_histogram_manager = LAZY_INSTANCE_INITIALIZER;
HistogramManager::HistogramManager() : histogram_snapshot_manager_(this) {
}
HistogramManager::~HistogramManager() {
}
// static
HistogramManager* HistogramManager::GetInstance() {
return g_histogram_manager.Pointer();
}
void HistogramManager::RecordDelta(const base::HistogramBase& histogram,
const base::HistogramSamples& snapshot) {
EncodeHistogramDelta(histogram.histogram_name(), snapshot, &uma_proto_);
}
void HistogramManager::InconsistencyDetected(
base::HistogramBase::Inconsistency problem) {
UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowser.Cronet",
problem, base::HistogramBase::NEVER_EXCEEDED_VALUE);
}
void HistogramManager::UniqueInconsistencyDetected(
base::HistogramBase::Inconsistency problem) {
UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowserUnique.Cronet",
problem, base::HistogramBase::NEVER_EXCEEDED_VALUE);
}
void HistogramManager::InconsistencyDetectedInLoggedCount(int amount) {
UMA_HISTOGRAM_COUNTS("Histogram.InconsistentSnapshotBrowser.Cronet",
std::abs(amount));
}
bool HistogramManager::GetDeltas(std::vector<uint8_t>* data) {
if (get_deltas_lock_.Try()) {
base::AutoLock lock(get_deltas_lock_, base::AutoLock::AlreadyAcquired());
// Clear the protobuf between calls.
uma_proto_.Clear();
// "false" to StatisticsRecorder::begin() indicates to *not* include
// histograms held in persistent storage on the assumption that they will be
// visible to the recipient through other means.
histogram_snapshot_manager_.PrepareDeltas(
base::StatisticsRecorder::begin(false), base::StatisticsRecorder::end(),
base::Histogram::kNoFlags, base::Histogram::kUmaTargetedHistogramFlag);
int32_t data_size = uma_proto_.ByteSize();
data->resize(data_size);
if (uma_proto_.SerializeToArray(&(*data)[0], data_size))
return true;
}
data->clear();
return false;
}
} // namespace cronet
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