c246440dc5
- provided C++ Histogram metric logging API with UID Bug: 266586106 Test: m Change-Id: I2ee92d423be5f9c137fa160d8c744340972f8036
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
//
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// Copyright (C) 2023 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "include/Histogram.h"
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#define LOG_TAG "tex"
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#include <log/log.h>
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#include <statslog_express.h>
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#include <string.h>
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#include <utils/hash/farmhash.h>
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namespace android {
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namespace expresslog {
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std::shared_ptr<Histogram::UniformOptions> Histogram::UniformOptions::create(
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int binCount, float minValue, float exclusiveMaxValue) {
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if (binCount < 1) {
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ALOGE("Bin count should be positive number");
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return nullptr;
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}
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if (exclusiveMaxValue <= minValue) {
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ALOGE("Bins range invalid (maxValue < minValue)");
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return nullptr;
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}
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return std::shared_ptr<UniformOptions>(
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new UniformOptions(binCount, minValue, exclusiveMaxValue));
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}
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Histogram::UniformOptions::UniformOptions(int binCount, float minValue, float exclusiveMaxValue)
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: // Implicitly add 2 for the extra undeflow & overflow bins
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mBinCount(binCount + 2),
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mMinValue(minValue),
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mExclusiveMaxValue(exclusiveMaxValue),
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mBinSize((exclusiveMaxValue - minValue) / binCount) {
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}
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int Histogram::UniformOptions::getBinForSample(float sample) const {
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if (sample < mMinValue) {
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// goes to underflow
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return 0;
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} else if (sample >= mExclusiveMaxValue) {
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// goes to overflow
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return mBinCount - 1;
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}
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return (int)((sample - mMinValue) / mBinSize + 1);
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}
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Histogram::Histogram(const char* metricName, std::shared_ptr<BinOptions> binOptions)
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: mMetricIdHash(farmhash::Fingerprint64(metricName, strlen(metricName))),
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mBinOptions(std::move(binOptions)) {
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}
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void Histogram::logSample(float sample) const {
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const int binIndex = mBinOptions->getBinForSample(sample);
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stats_write(EXPRESS_HISTOGRAM_SAMPLE_REPORTED, mMetricIdHash, /*count*/ 1, binIndex);
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}
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void Histogram::logSampleWithUid(int32_t uid, float sample) const {
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const int binIndex = mBinOptions->getBinForSample(sample);
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stats_write(EXPRESS_UID_HISTOGRAM_SAMPLE_REPORTED, mMetricIdHash, /*count*/ 1, binIndex, uid);
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}
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} // namespace expresslog
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} // namespace android
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