#include <libmythbase/mythpower.h>

Inheritance diagram for MythPower:

Collaboration diagram for MythPower:

Public Types
enum	PowerLevel : std::int8_t { UPS = -2 , ACPower = -1 , BatteryEmpty = 0 , BatteryLow = 10 , BatteryFull = 100 , UnknownPower = 101 , Unset = 102 }

enum	Feature : std::uint8_t { FeatureNone = 0x00 , FeatureShutdown = 0x01 , FeatureSuspend = 0x02 , FeatureHibernate = 0x04 , FeatureRestart = 0x08 , FeatureHybridSleep = 0x10 }

Public Slots
virtual void	CancelFeature (void)
	This is untested as it is currently not clear whether it is useful. More...

Signals
void	ShuttingDown (void)

void	Suspending (void)

void	Hibernating (void)

void	Restarting (void)

void	HybridSleeping (void)

void	WillShutDown (std::chrono::milliseconds MilliSeconds=0ms)

void	WillSuspend (std::chrono::milliseconds MilliSeconds=0ms)

void	WillHibernate (std::chrono::milliseconds MilliSeconds=0ms)

void	WillRestart (std::chrono::milliseconds MilliSeconds=0ms)

void	WillHybridSleep (std::chrono::milliseconds MilliSeconds=0ms)

void	WokeUp (std::chrono::seconds SecondsAsleep)

void	LowBattery (void)

Public Member Functions
virtual bool	RequestFeature (Feature Request, bool Delay=true)

Features	GetFeatures (void)

bool	IsFeatureSupported (Feature Supported)

int	GetPowerLevel (void) const

QStringList	GetFeatureList (void)

Public Member Functions inherited from ReferenceCounter
	ReferenceCounter (const QString &debugName, bool logDebug=true)
	Creates reference counter with an initial value of 1. More...

virtual int	IncrRef (void)
	Increments reference count. More...

virtual int	DecrRef (void)
	Decrements reference count and deletes on 0. More...

Static Public Member Functions
static MythPower *	AcquireRelease (void *Reference, bool Acquire, std::chrono::seconds MinimumDelay=0s)

Static Public Member Functions inherited from ReferenceCounter
static void	PrintDebug (void)
	Print out any leaks if that level of debugging is enabled. More...

Protected Slots
void	FeatureTimeout (void)

virtual void	Refresh (void)

Protected Member Functions
	MythPower ()

	~MythPower () override=default

virtual void	Init (void)

virtual bool	DoFeature (bool=false)

virtual void	DidWakeUp (void)

virtual void	FeatureHappening (Feature Spontaneous=FeatureNone)
	Signal to the rest of MythTV that the given feature will happen now. More...

virtual bool	ScheduleFeature (enum Feature Type, std::chrono::seconds Delay)

void	SetRequestedDelay (std::chrono::seconds Delay)

void	PowerLevelChanged (int Level)

Protected Member Functions inherited from ReferenceCounter
virtual	~ReferenceCounter (void)
	Called on destruction, will warn if object deleted with references in place. More...

Static Protected Member Functions
static QString	FeatureToString (enum Feature Type)

static bool	FeatureIsEquivalent (Feature First, Feature Second)

Protected Attributes
Features	m_features { FeatureNone }

Feature	m_scheduledFeature { FeatureNone }

bool	m_isSpontaneous { false }

std::chrono::seconds	m_maxRequestedDelay { 0s }

std::chrono::seconds	m_maxSupportedDelay { MAXIMUM_SHUTDOWN_WAIT }

QTimer	m_featureTimer

QDateTime	m_sleepTime

int	m_powerLevel { Unset }

bool	m_warnForLowBattery { false }

Protected Attributes inherited from ReferenceCounter
bool	m_logDebug
	This is used to suppress creating LoggingItem classes for LoggingItem reference count changes. More...

QAtomicInt	m_referenceCount {1}

Static Protected Attributes
static QRecursiveMutex	s_lock

Detailed Description

MythPower is a reference counted, singleton class.

Classes wishing to listen for or schedule power events should acquire a reference to MythPower via AcquireRelease using a suitable Reference and Acquire set to true.

AcquireRelease will always return a valid pointer but the default implementation has no actual power support.

If the class in question wishes to register a delay so that it can safely cleanup before shutdown/suspend, it should pass a MinimumDelay (seconds) to AcquireRelease. The MythPower object will then attempt to delay any events for at least that period of time. This behaviour is not guaranteed - most notably in the case of externally triggered events. The actual delay attempted will be the maximum of those registered and, in the case of user initiated events, the EXIT_SHUTDOWN_DELAY user setting (which defaults to 3 seconds).

There is no method to subsequently alter the delay. Should this be needed, release the current reference and re-acquire with a new MinimumDelay. To ensure the underlying MythPower object is not deleted, take a temporary reference with AcquireRelease using a different, unique Reference value.

Do not acquire multiple references with the same Reference value. This will lead to unexpected delay behaviour.

To release the MythPower reference, call AcquireRelease with the same Reference (typically a pointer to the owning class) and Acquire set to false.

To check supported power behaviours, call either GetFeatures or IsFeatureSupported.

Call RequestFeature to initiate shutdown/suspend etc. The default behaviour is to delay the action.

Call CancelFeature to cancel a previously scheduled shutdown/suspend.

Note: CancelFeature is currently untested and may be removed. It is unclear whether it is useable. As soon as the feature is requested, various system processes start to shutdown. This often renders the GUI either unresponsive or simply not visible. Hence trying to show a cancel dialog is pointless.

Signals

WillShutdown etc are emitted in advance and provide the listener with an opportunity to do stuff. There is no guarantee on how long they have. ShuttingDown etc are emitted when the requested feature (or system event) is imminent. There is, in theory, no time to do stuff. WokeUp is emitted when the system has been woken up OR when a scheduled event has been cancelled.

Todo:

Add OSX subclass

Add Windows subclass

Add Android subclass

Add sending Myth events as well as emitting signals.

Definition at line 19 of file mythpower.h.

Member Enumeration Documentation

◆ Feature

enum MythPower::Feature : std::uint8_t

Enumerator
FeatureNone
FeatureShutdown
FeatureSuspend
FeatureHibernate
FeatureRestart
FeatureHybridSleep

Definition at line 35 of file mythpower.h.

◆ PowerLevel

enum MythPower::PowerLevel : std::int8_t

Enumerator
UPS
ACPower
BatteryEmpty
BatteryLow
BatteryFull
UnknownPower
Unset

Definition at line 24 of file mythpower.h.

Constructor & Destructor Documentation

◆ MythPower()

MythPower::MythPower ( )

protected

Definition at line 123 of file mythpower.cpp.

Referenced by AcquireRelease().

◆ ~MythPower()

MythPower::~MythPower ( )

overrideprotecteddefault

Member Function Documentation

◆ AcquireRelease()

MythPower * MythPower::AcquireRelease	(	void *	Reference,
		bool	Acquire,
		std::chrono::seconds	MinimumDelay = `0s`
	)

static

Definition at line 74 of file mythpower.cpp.

Referenced by MythCoreContext::InitPower(), ShutDownRebootSetting::ShutDownRebootSetting(), UPnp::UPnp(), ExitPrompter::~ExitPrompter(), MythCoreContextPrivate::~MythCoreContextPrivate(), and UPnp::~UPnp().

◆ CancelFeature

void MythPower::CancelFeature ( void )

virtualslot

This is untested as it is currently not clear whether it is useful.

Definition at line 222 of file mythpower.cpp.

Referenced by MythPowerDBus::CancelFeature().

◆ DidWakeUp()

void MythPower::DidWakeUp ( void )

protectedvirtual

Reimplemented in MythPowerDBus.

Definition at line 328 of file mythpower.cpp.

Referenced by CancelFeature(), and MythPowerDBus::DidWakeUp().

◆ DoFeature()

virtual bool MythPower::DoFeature ( bool = false )

inlineprotectedvirtual

Reimplemented in MythPowerDBus, and MythPowerOSX.

Definition at line 82 of file mythpower.h.

Referenced by FeatureTimeout(), and RequestFeature().

◆ FeatureHappening()

void MythPower::FeatureHappening ( Feature Spontaneous = FeatureNone )

protectedvirtual

Signal to the rest of MythTV that the given feature will happen now.

Note: If other elements of MythTV have not previously been notified of a pending action there is little they can do now as there is no guarantee anything will be completed before the system goes offline.

Definition at line 301 of file mythpower.cpp.

Referenced by MythPowerDBus::DBusShuttingDown(), MythPowerDBus::DBusSuspending(), MythPowerOSX::DoFeature(), and MythPowerDBus::ReleaseLock().