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// Copyright (c) 2012 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/histogram_base.h"
#include <limits.h>
#include <memory>
#include <set>
#include <utility>
#include "base/json/json_string_value_serializer.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/histogram_samples.h"
#include "base/metrics/sparse_histogram.h"
#include "base/metrics/statistics_recorder.h"
#include "base/pickle.h"
#include "base/process/process_handle.h"
#include "base/rand_util.h"
#include "base/strings/stringprintf.h"
#include "base/synchronization/lock.h"
#include "base/values.h"
namespace base {
std::string HistogramTypeToString(HistogramType type) {
switch (type) {
case HISTOGRAM:
return "HISTOGRAM";
case LINEAR_HISTOGRAM:
return "LINEAR_HISTOGRAM";
case BOOLEAN_HISTOGRAM:
return "BOOLEAN_HISTOGRAM";
case CUSTOM_HISTOGRAM:
return "CUSTOM_HISTOGRAM";
case SPARSE_HISTOGRAM:
return "SPARSE_HISTOGRAM";
case DUMMY_HISTOGRAM:
return "DUMMY_HISTOGRAM";
}
NOTREACHED();
return "UNKNOWN";
}
HistogramBase* DeserializeHistogramInfo(PickleIterator* iter) {
int type;
if (!iter->ReadInt(&type))
return nullptr;
switch (type) {
case HISTOGRAM:
return Histogram::DeserializeInfoImpl(iter);
case LINEAR_HISTOGRAM:
return LinearHistogram::DeserializeInfoImpl(iter);
case BOOLEAN_HISTOGRAM:
return BooleanHistogram::DeserializeInfoImpl(iter);
case CUSTOM_HISTOGRAM:
return CustomHistogram::DeserializeInfoImpl(iter);
case SPARSE_HISTOGRAM:
return SparseHistogram::DeserializeInfoImpl(iter);
default:
return nullptr;
}
}
const HistogramBase::Sample HistogramBase::kSampleType_MAX = INT_MAX;
HistogramBase::HistogramBase(const char* name)
: histogram_name_(name), flags_(kNoFlags) {}
HistogramBase::~HistogramBase() = default;
void HistogramBase::CheckName(const StringPiece& name) const {
DCHECK_EQ(StringPiece(histogram_name()), name);
}
void HistogramBase::SetFlags(int32_t flags) {
HistogramBase::Count old_flags = subtle::NoBarrier_Load(&flags_);
subtle::NoBarrier_Store(&flags_, old_flags | flags);
}
void HistogramBase::ClearFlags(int32_t flags) {
HistogramBase::Count old_flags = subtle::NoBarrier_Load(&flags_);
subtle::NoBarrier_Store(&flags_, old_flags & ~flags);
}
void HistogramBase::AddScaled(Sample value, int count, int scale) {
DCHECK_LT(0, scale);
// Convert raw count and probabilistically round up/down if the remainder
// is more than a random number [0, scale). This gives a more accurate
// count when there are a large number of records. RandInt is "inclusive",
// hence the -1 for the max value.
int64_t count_scaled = count / scale;
if (count - (count_scaled * scale) > base::RandInt(0, scale - 1))
count_scaled += 1;
if (count_scaled == 0)
return;
AddCount(value, count_scaled);
}
void HistogramBase::AddKilo(Sample value, int count) {
AddScaled(value, count, 1000);
}
void HistogramBase::AddKiB(Sample value, int count) {
AddScaled(value, count, 1024);
}
void HistogramBase::AddTime(const TimeDelta& time) {
Add(static_cast<Sample>(time.InMilliseconds()));
}
void HistogramBase::AddBoolean(bool value) {
Add(value ? 1 : 0);
}
void HistogramBase::SerializeInfo(Pickle* pickle) const {
pickle->WriteInt(GetHistogramType());
SerializeInfoImpl(pickle);
}
uint32_t HistogramBase::FindCorruption(const HistogramSamples& samples) const {
// Not supported by default.
return NO_INCONSISTENCIES;
}
void HistogramBase::WriteJSON(std::string* output,
JSONVerbosityLevel verbosity_level) const {
Count count;
int64_t sum;
std::unique_ptr<ListValue> buckets(new ListValue());
GetCountAndBucketData(&count, &sum, buckets.get());
std::unique_ptr<DictionaryValue> parameters(new DictionaryValue());
GetParameters(parameters.get());
JSONStringValueSerializer serializer(output);
DictionaryValue root;
root.SetString("name", histogram_name());
root.SetInteger("count", count);
root.SetDouble("sum", static_cast<double>(sum));
root.SetInteger("flags", flags());
root.Set("params", std::move(parameters));
if (verbosity_level != JSON_VERBOSITY_LEVEL_OMIT_BUCKETS)
root.Set("buckets", std::move(buckets));
root.SetInteger("pid", GetUniqueIdForProcess());
serializer.Serialize(root);
}
void HistogramBase::FindAndRunCallback(HistogramBase::Sample sample) const {
if ((flags() & kCallbackExists) == 0)
return;
StatisticsRecorder::OnSampleCallback cb =
StatisticsRecorder::FindCallback(histogram_name());
if (!cb.is_null())
cb.Run(sample);
}
void HistogramBase::WriteAsciiBucketGraph(double current_size,
double max_size,
std::string* output) const {
const int k_line_length = 72; // Maximal horizontal width of graph.
int x_count = static_cast<int>(k_line_length * (current_size / max_size)
+ 0.5);
int x_remainder = k_line_length - x_count;
while (0 < x_count--)
output->append("-");
output->append("O");
while (0 < x_remainder--)
output->append(" ");
}
const std::string HistogramBase::GetSimpleAsciiBucketRange(
Sample sample) const {
return StringPrintf("%d", sample);
}
void HistogramBase::WriteAsciiBucketValue(Count current,
double scaled_sum,
std::string* output) const {
StringAppendF(output, " (%d = %3.1f%%)", current, current/scaled_sum);
}
// static
char const* HistogramBase::GetPermanentName(const std::string& name) {
// A set of histogram names that provides the "permanent" lifetime required
// by histogram objects for those strings that are not already code constants
// or held in persistent memory.
static LazyInstance<std::set<std::string>>::Leaky permanent_names;
static LazyInstance<Lock>::Leaky permanent_names_lock;
AutoLock lock(permanent_names_lock.Get());
auto result = permanent_names.Get().insert(name);
return result.first->c_str();
}
} // namespace base
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