MediaMetrics: Add device-based actions for Bluetooth
Log summary group statistics by device.
Test: adb shell dumpsys media.metrics
Bug: 149850236
Change-Id: I31fef89fa020de175e59784049ef4741914f3a2c
diff --git a/services/mediametrics/TimedAction.h b/services/mediametrics/TimedAction.h
new file mode 100644
index 0000000..c7ef585
--- /dev/null
+++ b/services/mediametrics/TimedAction.h
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2020 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 <android-base/thread_annotations.h>
+#include <chrono>
+#include <map>
+#include <mutex>
+#include <thread>
+
+namespace android::mediametrics {
+
+class TimedAction {
+public:
+ TimedAction() : mThread{[this](){threadLoop();}} {}
+
+ ~TimedAction() {
+ quit();
+ }
+
+ // TODO: return a handle for cancelling the action?
+ template <typename T> // T is in units of std::chrono::duration.
+ void postIn(const T& time, std::function<void()> f) {
+ postAt(std::chrono::steady_clock::now() + time, f);
+ }
+
+ template <typename T> // T is in units of std::chrono::time_point
+ void postAt(const T& targetTime, std::function<void()> f) {
+ std::lock_guard l(mLock);
+ if (mQuit) return;
+ if (mMap.empty() || targetTime < mMap.begin()->first) {
+ mMap.emplace_hint(mMap.begin(), targetTime, std::move(f));
+ mCondition.notify_one();
+ } else {
+ mMap.emplace(targetTime, std::move(f));
+ }
+ }
+
+ void clear() {
+ std::lock_guard l(mLock);
+ mMap.clear();
+ }
+
+ void quit() {
+ {
+ std::lock_guard l(mLock);
+ if (mQuit) return;
+ mQuit = true;
+ mMap.clear();
+ mCondition.notify_all();
+ }
+ mThread.join();
+ }
+
+ size_t size() const {
+ std::lock_guard l(mLock);
+ return mMap.size();
+ }
+
+private:
+ void threadLoop() NO_THREAD_SAFETY_ANALYSIS { // thread safety doesn't cover unique_lock
+ std::unique_lock l(mLock);
+ while (!mQuit) {
+ auto sleepUntilTime = std::chrono::time_point<std::chrono::steady_clock>::max();
+ if (!mMap.empty()) {
+ sleepUntilTime = mMap.begin()->first;
+ if (sleepUntilTime <= std::chrono::steady_clock::now()) {
+ auto node = mMap.extract(mMap.begin()); // removes from mMap.
+ l.unlock();
+ node.mapped()();
+ l.lock();
+ continue;
+ }
+ }
+ mCondition.wait_until(l, sleepUntilTime);
+ }
+ }
+
+ mutable std::mutex mLock;
+ std::condition_variable mCondition GUARDED_BY(mLock);
+ bool mQuit GUARDED_BY(mLock) = false;
+ std::multimap<std::chrono::time_point<std::chrono::steady_clock>, std::function<void()>>
+ mMap GUARDED_BY(mLock); // multiple functions could execute at the same time.
+
+ // needs to be initialized after the variables above, done in constructor initializer list.
+ std::thread mThread;
+};
+
+} // namespace android::mediametrics