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/*
* Copyright (C) 2021 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.
*/
#pragma once
#include <PowerStats.h>
#include <android-base/chrono_utils.h>
#include <chrono>
#include <random>
namespace aidl {
namespace android {
namespace hardware {
namespace power {
namespace stats {
class FakeEnergyMeter : public PowerStats::IEnergyMeter {
public:
FakeEnergyMeter(std::vector<std::pair<std::string, std::string>> channelNames) {
int32_t channelId = 0;
for (const auto& [name, subsystem] : channelNames) {
Channel c;
c.id = channelId++;
c.name = name;
c.subsystem = subsystem;
EnergyMeasurement m;
m.id = c.id;
m.timestampMs = 0;
m.durationMs = 0;
m.energyUWs = 0;
mChannels.push_back(c);
mEnergyMeasurements.push_back(m);
}
}
~FakeEnergyMeter() = default;
ndk::ScopedAStatus readEnergyMeter(const std::vector<int32_t>& in_channelIds,
std::vector<EnergyMeasurement>* _aidl_return) override {
for (auto& measurement : mEnergyMeasurements) {
mFakeEnergyMeasurement.update(&measurement);
}
if (in_channelIds.empty()) {
*_aidl_return = mEnergyMeasurements;
} else {
for (int32_t id : in_channelIds) {
// check for invalid ids
if (id < 0 || id >= mEnergyMeasurements.size()) {
return ndk::ScopedAStatus(AStatus_fromExceptionCode(EX_ILLEGAL_ARGUMENT));
}
_aidl_return->push_back(mEnergyMeasurements[id]);
}
}
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus getEnergyMeterInfo(std::vector<Channel>* _aidl_return) override {
*_aidl_return = mChannels;
return ndk::ScopedAStatus::ok();
}
private:
class FakeEnergyMeasurement {
public:
FakeEnergyMeasurement() : mDistribution(1, 100) {}
void update(EnergyMeasurement* measurement) {
// generates number in the range 1..100
auto randNum = std::bind(mDistribution, mGenerator);
// Get current time since boot in milliseconds
uint64_t now = std::chrono::time_point_cast<std::chrono::milliseconds>(
::android::base::boot_clock::now())
.time_since_epoch()
.count();
measurement->timestampMs = now;
measurement->durationMs = now;
measurement->energyUWs += randNum() * 100;
}
private:
std::default_random_engine mGenerator;
std::uniform_int_distribution<int> mDistribution;
};
std::vector<Channel> mChannels;
FakeEnergyMeasurement mFakeEnergyMeasurement;
std::vector<EnergyMeasurement> mEnergyMeasurements;
};
} // namespace stats
} // namespace power
} // namespace hardware
} // namespace android
} // namespace aidl
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