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//
// Copyright (C) 2023 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "include/Histogram.h"
#define LOG_TAG "tex"
#include <log/log.h>
#include <statslog_express.h>
#include <string.h>
#include <utils/hash/farmhash.h>
namespace android {
namespace expresslog {
std::shared_ptr<Histogram::UniformOptions> Histogram::UniformOptions::create(
int binCount, float minValue, float exclusiveMaxValue) {
if (binCount < 1) {
ALOGE("Bin count should be positive number");
return nullptr;
}
if (exclusiveMaxValue <= minValue) {
ALOGE("Bins range invalid (maxValue < minValue)");
return nullptr;
}
return std::shared_ptr<UniformOptions>(
new UniformOptions(binCount, minValue, exclusiveMaxValue));
}
Histogram::UniformOptions::UniformOptions(int binCount, float minValue, float exclusiveMaxValue)
: // Implicitly add 2 for the extra undeflow & overflow bins
mBinCount(binCount + 2),
mMinValue(minValue),
mExclusiveMaxValue(exclusiveMaxValue),
mBinSize((exclusiveMaxValue - minValue) / binCount) {
}
int Histogram::UniformOptions::getBinForSample(float sample) const {
if (sample < mMinValue) {
// goes to underflow
return 0;
} else if (sample >= mExclusiveMaxValue) {
// goes to overflow
return mBinCount - 1;
}
return (int)((sample - mMinValue) / mBinSize + 1);
}
Histogram::Histogram(const char* metricName, std::shared_ptr<BinOptions> binOptions)
: mMetricIdHash(farmhash::Fingerprint64(metricName, strlen(metricName))),
mBinOptions(std::move(binOptions)) {
}
void Histogram::logSample(float sample) const {
const int binIndex = mBinOptions->getBinForSample(sample);
stats_write(EXPRESS_HISTOGRAM_SAMPLE_REPORTED, mMetricIdHash, /*count*/ 1, binIndex);
}
void Histogram::logSampleWithUid(int32_t uid, float sample) const {
const int binIndex = mBinOptions->getBinForSample(sample);
stats_write(EXPRESS_UID_HISTOGRAM_SAMPLE_REPORTED, mMetricIdHash, /*count*/ 1, binIndex, uid);
}
} // namespace expresslog
} // namespace android
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