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/*
* Copyright (C) 2021 The Android Open Source Project
* Android BPF library - public API
*
* 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 "LongArrayMultiStateCounter.h"
#include <log/log.h>
namespace android {
namespace battery {
template <>
bool LongArrayMultiStateCounter::delta(const std::vector<uint64_t>& previousValue,
const std::vector<uint64_t>& newValue,
std::vector<uint64_t>* outValue) const {
size_t size = previousValue.size();
if (newValue.size() != size) {
ALOGE("Incorrect array size: %d, should be %d", (int)newValue.size(), (int)size);
return false;
}
bool is_delta_valid = true;
for (int i = size - 1; i >= 0; i--) {
if (newValue[i] >= previousValue[i]) {
(*outValue)[i] = newValue[i] - previousValue[i];
} else {
(*outValue)[i] = 0;
is_delta_valid = false;
}
}
return is_delta_valid;
}
template <>
void LongArrayMultiStateCounter::add(std::vector<uint64_t>* value1,
const std::vector<uint64_t>& value2, const uint64_t numerator,
const uint64_t denominator) const {
if (numerator != denominator) {
for (int i = value2.size() - 1; i >= 0; i--) {
// The caller ensures that denominator != 0
(*value1)[i] += value2[i] * numerator / denominator;
}
} else {
for (int i = value2.size() - 1; i >= 0; i--) {
(*value1)[i] += value2[i];
}
}
}
template <>
std::string LongArrayMultiStateCounter::valueToString(const std::vector<uint64_t>& v) const {
std::stringstream s;
s << "{";
bool first = true;
for (uint64_t n : v) {
if (!first) {
s << ", ";
}
s << n;
first = false;
}
s << "}";
return s.str();
}
} // namespace battery
} // namespace android
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