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/*
* Copyright (C) 2016-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#pragma once
#include "EventLockHandle.h"
#include "EventPollHandle.h"
#include "PeripheralTypes.h"
#include "threads/CriticalSection.h"
#include "threads/Event.h"
#include "threads/Thread.h"
#include <chrono>
#include <set>
namespace PERIPHERALS
{
class IEventScannerCallback;
/*!
* \brief Class to scan for peripheral events
*
* By default, a rate of 60 Hz is used. A client can obtain control over when
* input is handled by registering for a polling handle.
*/
class CEventScanner : public IEventPollCallback, public IEventLockCallback, protected CThread
{
public:
explicit CEventScanner(IEventScannerCallback& callback);
~CEventScanner() override = default;
void Start();
void Stop();
EventPollHandlePtr RegisterPollHandle();
/*!
* \brief Acquire a lock that prevents event processing while held
*/
EventLockHandlePtr RegisterLock();
// implementation of IEventPollCallback
void Activate(CEventPollHandle& handle) override;
void Deactivate(CEventPollHandle& handle) override;
void HandleEvents(bool bWait) override;
void Release(CEventPollHandle& handle) override;
// implementation of IEventLockCallback
void ReleaseLock(CEventLockHandle& handle) override;
protected:
// implementation of CThread
void Process() override;
private:
std::chrono::milliseconds GetScanIntervalMs() const;
// Construction parameters
IEventScannerCallback& m_callback;
// Event parameters
std::set<void*> m_activeHandles;
std::set<void*> m_activeLocks;
CEvent m_scanEvent;
CEvent m_scanFinishedEvent;
mutable CCriticalSection m_handleMutex;
CCriticalSection m_lockMutex;
CCriticalSection m_pollMutex; // Prevent two poll handles from polling at once
};
} // namespace PERIPHERALS
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