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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 <utility>
#include "base/json/json_string_value_serializer.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram.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/strings/stringprintf.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";
default:
NOTREACHED();
}
return "UNKNOWN";
}
HistogramBase* DeserializeHistogramInfo(PickleIterator* iter) {
int type;
if (!iter->ReadInt(&type))
return NULL;
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 NULL;
}
}
const HistogramBase::Sample HistogramBase::kSampleType_MAX = INT_MAX;
HistogramBase::HistogramBase(const std::string& name)
: histogram_name_(name),
flags_(kNoFlags) {}
HistogramBase::~HistogramBase() {}
void HistogramBase::CheckName(const StringPiece& name) const {
DCHECK_EQ(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::AddTime(const TimeDelta& time) {
Add(static_cast<Sample>(time.InMilliseconds()));
}
void HistogramBase::AddBoolean(bool value) {
Add(value ? 1 : 0);
}
bool HistogramBase::SerializeInfo(Pickle* pickle) const {
if (!pickle->WriteInt(GetHistogramType()))
return false;
return SerializeInfoImpl(pickle);
}
uint32_t HistogramBase::FindCorruption(const HistogramSamples& samples) const {
// Not supported by default.
return NO_INCONSISTENCIES;
}
void HistogramBase::WriteJSON(std::string* output) const {
Count count;
int64_t sum;
scoped_ptr<ListValue> buckets(new ListValue());
GetCountAndBucketData(&count, &sum, buckets.get());
scoped_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));
root.Set("buckets", std::move(buckets));
root.SetInteger("pid", GetCurrentProcId());
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 {
std::string result;
if (kHexRangePrintingFlag & flags())
StringAppendF(&result, "%#x", sample);
else
StringAppendF(&result, "%d", sample);
return result;
}
void HistogramBase::WriteAsciiBucketValue(Count current,
double scaled_sum,
std::string* output) const {
StringAppendF(output, " (%d = %3.1f%%)", current, current/scaled_sum);
}
} // namespace base
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