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/*
* Copyright 2024 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 "InputThread.h"
#include "InputTracingPerfettoBackend.h"
#include <android-base/thread_annotations.h>
#include <mutex>
#include <variant>
#include <vector>
namespace android::inputdispatcher::trace::impl {
/**
* A wrapper around an InputTracingBackend implementation that writes to the inner tracing backend
* from a single new thread that it creates. The new tracing thread is started when the
* ThreadedBackend is created, and is stopped when it is destroyed. The ThreadedBackend is
* thread-safe.
*/
template <typename Backend>
class ThreadedBackend : public InputTracingBackendInterface {
public:
ThreadedBackend(Backend&& innerBackend);
~ThreadedBackend() override;
void traceKeyEvent(const TracedKeyEvent&) override;
void traceMotionEvent(const TracedMotionEvent&) override;
void traceWindowDispatch(const WindowDispatchArgs&) override;
private:
std::mutex mLock;
InputThread mTracerThread;
bool mThreadExit GUARDED_BY(mLock){false};
std::condition_variable mThreadWakeCondition;
Backend mBackend;
using TraceEntry = std::variant<TracedKeyEvent, TracedMotionEvent, WindowDispatchArgs>;
std::vector<TraceEntry> mQueue GUARDED_BY(mLock);
using WindowDispatchArgs = InputTracingBackendInterface::WindowDispatchArgs;
void threadLoop();
};
} // namespace android::inputdispatcher::trace::impl
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