power/stats: Add default implementation
Bug: 181592995
Test: atest VtsHalPowerStatsTargetTest
Change-Id: I87ea4974f857ebd126b80a45c7d7403307bceb03
diff --git a/power/stats/aidl/default/FakeEnergyConsumer.h b/power/stats/aidl/default/FakeEnergyConsumer.h
new file mode 100644
index 0000000..f41aa6e
--- /dev/null
+++ b/power/stats/aidl/default/FakeEnergyConsumer.h
@@ -0,0 +1,83 @@
+/*
+ * 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 FakeEnergyConsumer : public PowerStats::IEnergyConsumer {
+ public:
+ FakeEnergyConsumer(EnergyConsumerType type, std::string name) : mType(type), mName(name) {
+ mResult.timestampMs = 0;
+ mResult.energyUWs = 0;
+ mResult.attribution = {};
+ }
+
+ ~FakeEnergyConsumer() = default;
+
+ std::string getName() override { return mName; }
+
+ EnergyConsumerType getType() override { return mType; }
+
+ std::optional<EnergyConsumerResult> getEnergyConsumed() override {
+ mFakeEnergyConsumerResult.update(&mResult);
+ return mResult;
+ }
+
+ private:
+ class FakeEnergyConsumerResult {
+ public:
+ FakeEnergyConsumerResult() : mDistribution(1, 100) {}
+ void update(EnergyConsumerResult* result) {
+ // 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();
+ result->timestampMs = now;
+ result->energyUWs += randNum() * 100;
+ }
+
+ private:
+ std::default_random_engine mGenerator;
+ std::uniform_int_distribution<int> mDistribution;
+ };
+
+ EnergyConsumerType mType;
+ std::string mName;
+ FakeEnergyConsumerResult mFakeEnergyConsumerResult;
+ EnergyConsumerResult mResult;
+};
+
+} // namespace stats
+} // namespace power
+} // namespace hardware
+} // namespace android
+} // namespace aidl
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