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record_histogram.cc
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record_histogram.cc
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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 "base/android/record_histogram.h"
#include <stdint.h>
#include <map>
#include <string>
#include "base/android/jni_android.h"
#include "base/android/jni_string.h"
#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/metrics/histogram.h"
#include "base/metrics/sparse_histogram.h"
#include "base/metrics/statistics_recorder.h"
#include "base/strings/stringprintf.h"
#include "base/synchronization/lock.h"
#include "base/time/time.h"
#include "jni/RecordHistogram_jni.h"
namespace base {
namespace android {
namespace {
// Simple thread-safe wrapper for caching histograms. This avoids
// relatively expensive JNI string translation for each recording.
class HistogramCache {
public:
HistogramCache() {}
std::string HistogramConstructionParamsToString(HistogramBase* histogram) {
std::string params_str = histogram->histogram_name();
switch (histogram->GetHistogramType()) {
case HISTOGRAM:
case LINEAR_HISTOGRAM:
case BOOLEAN_HISTOGRAM:
case CUSTOM_HISTOGRAM: {
Histogram* hist = static_cast<Histogram*>(histogram);
params_str += StringPrintf("/%d/%d/%d", hist->declared_min(),
hist->declared_max(), hist->bucket_count());
break;
}
case SPARSE_HISTOGRAM:
break;
}
return params_str;
}
void CheckHistogramArgs(JNIEnv* env,
jstring j_histogram_name,
int32_t expected_min,
int32_t expected_max,
uint32_t expected_bucket_count,
HistogramBase* histogram) {
std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);
bool valid_arguments = Histogram::InspectConstructionArguments(
histogram_name, &expected_min, &expected_max, &expected_bucket_count);
DCHECK(valid_arguments);
DCHECK(histogram->HasConstructionArguments(expected_min, expected_max,
expected_bucket_count))
<< histogram_name << "/" << expected_min << "/" << expected_max << "/"
<< expected_bucket_count << " vs. "
<< HistogramConstructionParamsToString(histogram);
}
HistogramBase* BooleanHistogram(JNIEnv* env,
jstring j_histogram_name,
jlong j_histogram_key) {
DCHECK(j_histogram_name);
HistogramBase* histogram = HistogramFromKey(j_histogram_key);
if (histogram)
return histogram;
std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);
histogram = BooleanHistogram::FactoryGet(
histogram_name, HistogramBase::kUmaTargetedHistogramFlag);
return histogram;
}
HistogramBase* EnumeratedHistogram(JNIEnv* env,
jstring j_histogram_name,
jlong j_histogram_key,
jint j_boundary) {
DCHECK(j_histogram_name);
HistogramBase* histogram = HistogramFromKey(j_histogram_key);
int32_t boundary = static_cast<int32_t>(j_boundary);
if (histogram) {
CheckHistogramArgs(env, j_histogram_name, 1, boundary, boundary + 1,
histogram);
return histogram;
}
std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);
histogram =
LinearHistogram::FactoryGet(histogram_name, 1, boundary, boundary + 1,
HistogramBase::kUmaTargetedHistogramFlag);
return histogram;
}
HistogramBase* CustomCountHistogram(JNIEnv* env,
jstring j_histogram_name,
jlong j_histogram_key,
jint j_min,
jint j_max,
jint j_num_buckets) {
DCHECK(j_histogram_name);
int32_t min = static_cast<int32_t>(j_min);
int32_t max = static_cast<int32_t>(j_max);
int32_t num_buckets = static_cast<int32_t>(j_num_buckets);
HistogramBase* histogram = HistogramFromKey(j_histogram_key);
if (histogram) {
CheckHistogramArgs(env, j_histogram_name, min, max, num_buckets,
histogram);
return histogram;
}
DCHECK_GE(min, 1) << "The min expected sample must be >= 1";
std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);
histogram =
Histogram::FactoryGet(histogram_name, min, max, num_buckets,
HistogramBase::kUmaTargetedHistogramFlag);
return histogram;
}
HistogramBase* LinearCountHistogram(JNIEnv* env,
jstring j_histogram_name,
jlong j_histogram_key,
jint j_min,
jint j_max,
jint j_num_buckets) {
DCHECK(j_histogram_name);
int32_t min = static_cast<int32_t>(j_min);
int32_t max = static_cast<int32_t>(j_max);
int32_t num_buckets = static_cast<int32_t>(j_num_buckets);
HistogramBase* histogram = HistogramFromKey(j_histogram_key);
if (histogram) {
CheckHistogramArgs(env, j_histogram_name, min, max, num_buckets,
histogram);
return histogram;
}
std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);
histogram =
LinearHistogram::FactoryGet(histogram_name, min, max, num_buckets,
HistogramBase::kUmaTargetedHistogramFlag);
return histogram;
}
HistogramBase* SparseHistogram(JNIEnv* env,
jstring j_histogram_name,
jlong j_histogram_key) {
DCHECK(j_histogram_name);
HistogramBase* histogram = HistogramFromKey(j_histogram_key);
if (histogram)
return histogram;
std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);
histogram = SparseHistogram::FactoryGet(
histogram_name, HistogramBase::kUmaTargetedHistogramFlag);
return histogram;
}
HistogramBase* CustomTimesHistogram(JNIEnv* env,
jstring j_histogram_name,
jlong j_histogram_key,
jint j_min,
jint j_max,
jint j_bucket_count) {
DCHECK(j_histogram_name);
HistogramBase* histogram = HistogramFromKey(j_histogram_key);
int32_t min = static_cast<int32_t>(j_min);
int32_t max = static_cast<int32_t>(j_max);
int32_t bucket_count = static_cast<int32_t>(j_bucket_count);
if (histogram) {
CheckHistogramArgs(env, j_histogram_name, min, max, bucket_count,
histogram);
return histogram;
}
std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);
// This intentionally uses FactoryGet and not FactoryTimeGet. FactoryTimeGet
// is just a convenience for constructing the underlying Histogram with
// TimeDelta arguments.
histogram = Histogram::FactoryGet(histogram_name, min, max, bucket_count,
HistogramBase::kUmaTargetedHistogramFlag);
return histogram;
}
private:
// Convert a jlong |histogram_key| from Java to a HistogramBase* via a cast.
// The Java side caches these in a map (see RecordHistogram.java), which is
// safe to do since C++ Histogram objects are never freed.
static HistogramBase* HistogramFromKey(jlong j_histogram_key) {
return reinterpret_cast<HistogramBase*>(j_histogram_key);
}
DISALLOW_COPY_AND_ASSIGN(HistogramCache);
};
LazyInstance<HistogramCache>::Leaky g_histograms;
} // namespace
jlong RecordBooleanHistogram(JNIEnv* env,
const JavaParamRef<jclass>& clazz,
const JavaParamRef<jstring>& j_histogram_name,
jlong j_histogram_key,
jboolean j_sample) {
bool sample = static_cast<bool>(j_sample);
HistogramBase* histogram = g_histograms.Get().BooleanHistogram(
env, j_histogram_name, j_histogram_key);
histogram->AddBoolean(sample);
return reinterpret_cast<jlong>(histogram);
}
jlong RecordEnumeratedHistogram(JNIEnv* env,
const JavaParamRef<jclass>& clazz,
const JavaParamRef<jstring>& j_histogram_name,
jlong j_histogram_key,
jint j_sample,
jint j_boundary) {
int sample = static_cast<int>(j_sample);
HistogramBase* histogram = g_histograms.Get().EnumeratedHistogram(
env, j_histogram_name, j_histogram_key, j_boundary);
histogram->Add(sample);
return reinterpret_cast<jlong>(histogram);
}
jlong RecordCustomCountHistogram(JNIEnv* env,
const JavaParamRef<jclass>& clazz,
const JavaParamRef<jstring>& j_histogram_name,
jlong j_histogram_key,
jint j_sample,
jint j_min,
jint j_max,
jint j_num_buckets) {
int sample = static_cast<int>(j_sample);
HistogramBase* histogram = g_histograms.Get().CustomCountHistogram(
env, j_histogram_name, j_histogram_key, j_min, j_max, j_num_buckets);
histogram->Add(sample);
return reinterpret_cast<jlong>(histogram);
}
jlong RecordLinearCountHistogram(JNIEnv* env,
const JavaParamRef<jclass>& clazz,
const JavaParamRef<jstring>& j_histogram_name,
jlong j_histogram_key,
jint j_sample,
jint j_min,
jint j_max,
jint j_num_buckets) {
int sample = static_cast<int>(j_sample);
HistogramBase* histogram = g_histograms.Get().LinearCountHistogram(
env, j_histogram_name, j_histogram_key, j_min, j_max, j_num_buckets);
histogram->Add(sample);
return reinterpret_cast<jlong>(histogram);
}
jlong RecordSparseHistogram(JNIEnv* env,
const JavaParamRef<jclass>& clazz,
const JavaParamRef<jstring>& j_histogram_name,
jlong j_histogram_key,
jint j_sample) {
int sample = static_cast<int>(j_sample);
HistogramBase* histogram = g_histograms.Get().SparseHistogram(
env, j_histogram_name, j_histogram_key);
histogram->Add(sample);
return reinterpret_cast<jlong>(histogram);
}
jlong RecordCustomTimesHistogramMilliseconds(
JNIEnv* env,
const JavaParamRef<jclass>& clazz,
const JavaParamRef<jstring>& j_histogram_name,
jlong j_histogram_key,
jint j_duration,
jint j_min,
jint j_max,
jint j_num_buckets) {
HistogramBase* histogram = g_histograms.Get().CustomTimesHistogram(
env, j_histogram_name, j_histogram_key, j_min, j_max, j_num_buckets);
histogram->AddTime(
TimeDelta::FromMilliseconds(static_cast<int64_t>(j_duration)));
return reinterpret_cast<jlong>(histogram);
}
void Initialize(JNIEnv* env, const JavaParamRef<jclass>&) {
StatisticsRecorder::Initialize();
}
// This backs a Java test util for testing histograms -
// MetricsUtils.HistogramDelta. It should live in a test-specific file, but we
// currently can't have test-specific native code packaged in test-specific Java
// targets - see http://crbug.com/415945.
jint GetHistogramValueCountForTesting(
JNIEnv* env,
const JavaParamRef<jclass>& clazz,
const JavaParamRef<jstring>& histogram_name,
jint sample) {
HistogramBase* histogram = StatisticsRecorder::FindHistogram(
android::ConvertJavaStringToUTF8(env, histogram_name));
if (histogram == nullptr) {
// No samples have been recorded for this histogram (yet?).
return 0;
}
std::unique_ptr<HistogramSamples> samples = histogram->SnapshotSamples();
return samples->GetCount(static_cast<int>(sample));
}
bool RegisterRecordHistogram(JNIEnv* env) {
return RegisterNativesImpl(env);
}
} // namespace android
} // namespace base