A task that needs to performed by a plugin. More...

#include <process/Task.hpp>

Inheritance diagram for xentara::process::Task:

Public Types
enum class	Timing { RealTime , RealTimeCompatible , Conventional }
	The timing contraints of the task. More...

enum class	Stage { Startup , PreOperational , Operational , PostOperational , Shutdown , Suspended , Terminated , internal }
	The operational stages of Xentara. More...

enum class	Status { Pending , Ready , Completed }
	The status a task within an operational stage. More...

using	Stages = utils::core::Flags< Stage >
	A combination of operational stages.

Public Member Functions
virtual	~Task ()=0
	Virtual destructor.

virtual auto	timing () const -> Timing
	Called by the framework to get the timing requirements.

virtual auto	stages () const -> Stages
	Called by the framework to determine which stages the task implements.

virtual auto	schedule (const Track &track, std::optional< TimerSchedule > timerSchedule) -> void
	Called by the framework when the task is scheduled in an execution pipeline.

virtual auto	prepareStartup (const ExecutionContext &context) -> Status
	Called by the framework once at the beginning of the startup stage.

virtual auto	startup (const ExecutionContext &context) -> Status
	Called by the framework to perform the startup stage.

virtual auto	preparePreOperational (const ExecutionContext &context) -> Status
	Called by the framework once at the beginning of the pre-operational stage.

virtual auto	preOperational (const ExecutionContext &context) -> Status
	Called by the framework to perform the pre-operational stage.

virtual auto	operational (const ExecutionContext &context) -> void=0
	Called by the framework to perform the operational stage.

virtual auto	preparePostOperational (const ExecutionContext &context) -> Status
	Called by the framework once at the beginning of the post-operational stage.

virtual auto	postOperational (const ExecutionContext &context) -> Status
	Called by the framework to perform the post-operational stage.

virtual auto	prepareShutdown (const ExecutionContext &context) -> Status
	Called by the framework once at the beginning of the shutdown stage.

virtual auto	shutdown (const ExecutionContext &context) -> Status
	Called by the framework to perform the shutdown stage.

Public Member Functions inherited from xentara::utils::tools::DisableCopy
constexpr	DisableCopy () noexcept=default

	DisableCopy (const DisableCopy &)=delete

DisableCopy &	operator= (const DisableCopy &)=delete

Static Public Attributes
Standard Names
static const std::string_view	kReconnect
	The standard name for the reconnect task of an I/O component.

Detailed Description

A task that needs to performed by a plugin.

See also: Publishing Tasks; Tasks in the Xentara user manual

Member Typedef Documentation

◆ Stages

using xentara::process::Task::Stages = utils::core::Flags<Stage>

A combination of operational stages.

Member Enumeration Documentation

◆ Stage

enum class xentara::process::Task::Stage

strong

The operational stages of Xentara.

Enumerator
Startup	The startup stage. This stage is executed when Xentara starts up.
PreOperational	The pre-operational stage. This stage is executed after the startup stage, and when a paused workload is restarted.
Operational	The operational stage. This stage is executed while the workload is running.
PostOperational	This stage is executed before the shutdown stage, and when a workload is suspended.
Shutdown	This stage is executed once on Xentara shutdown.
Suspended	This stage denotes that a workload has been suspended. No operation takes place in the suspended stage.
Terminated	This is a pseudo-stage denotes that Xentara has terminated completely.

◆ Status

enum class xentara::process::Task::Status

strong

The status a task within an operational stage.

Enumerator

Pending

The task has not yet completed the work it needs to do in this stage.

    A task should return this status if it needs to be executed again to finish the work for this stage.
    Xentara will remain in the current stage, and the task will be executed again once an event or a timer
    it is attached to is triggered.

Ready

The task has completed the work it needs to do in this stage, but still wants to be executed.

    A task should return this status if it has completed all the work necessary to finish the stage, but 
    needs to be executed while other tasks complete their work. The task will keep being executed 
    whenever an event or a timer it is attached to is triggered, until all tasks in all tracks have finished their
    work for this stage.
    @note It is not possible to go back to the pending state once a task has returned this status. Once a 
    task has returned \a Ready for a certain stage, returning \a Pending later in the same stage
    has no effect. The stage will remain completed, but the task will be executed again as if it has returned
    \a Ready.

Completed

The task has completely finished the work it needs to do in this stage.

    A task should return this status if it has completed all the work it needs to do for this stage, and
    doesn't have to be called again for this stage.

◆ Timing

enum class xentara::process::Task::Timing

strong

The timing contraints of the task.

Enumerator
RealTime	The task must be executed as a real-time task.
RealTimeCompatible	The task can be executed as a real-time task, but need not.
Conventional	The task cannot be executed as a real-time task.

Constructor & Destructor Documentation

◆ ~Task()

xentara::process::Task::~Task ( )

pure virtualdefault

Virtual destructor.

Member Function Documentation

◆ operational()

virtual auto xentara::process::Task::operational ( const ExecutionContext & context ) -> void

pure virtual

Called by the framework to perform the operational stage.

Parameters

context A context that allows access to time stamps, counters, etc.

◆ postOperational()

virtual auto xentara::process::Task::postOperational ( const ExecutionContext & context ) -> Status

virtual

Called by the framework to perform the post-operational stage.

Default Implementation: The default implementation returns Status::Completed.

Parameters

context A context that allows access to time stamps, counters, etc.

Returns: The execution status for the current stage.

Reimplemented in xentara::process::StageAgnosticTask.

◆ preOperational()

virtual auto xentara::process::Task::preOperational ( const ExecutionContext & context ) -> Status

virtual

Called by the framework to perform the pre-operational stage.

Default Implementation: The default implementation returns Status::Completed.

Parameters

context A context that allows access to time stamps, counters, etc.

Returns: The execution status for the current stage.

Reimplemented in xentara::process::StageAgnosticTask.

◆ preparePostOperational()

virtual auto xentara::process::Task::preparePostOperational ( const ExecutionContext & context ) -> Status

virtual

Called by the framework once at the beginning of the post-operational stage.

Default Implementation: The default implementation returns Status::Pending.

Parameters

context A context that allows access to time stamps, counters, etc.

Returns: The execution status for the current stage.

Reimplemented in xentara::process::StageAgnosticTask.

◆ preparePreOperational()

virtual auto xentara::process::Task::preparePreOperational ( const ExecutionContext & context ) -> Status

virtual

Called by the framework once at the beginning of the pre-operational stage.

Default Implementation: The default implementation returns Status::Pending.

Parameters

context A context that allows access to time stamps, counters, etc.

Returns: The execution status for the current stage.

Reimplemented in xentara::process::StageAgnosticTask.

◆ prepareShutdown()

virtual auto xentara::process::Task::prepareShutdown ( const ExecutionContext & context ) -> Status

virtual

Called by the framework once at the beginning of the shutdown stage.

Default Implementation: The default implementation returns Status::Pending.

Parameters

context A context that allows access to time stamps, counters, etc.

Returns: The execution status for the current stage.

Reimplemented in xentara::process::StageAgnosticTask.

◆ prepareStartup()

virtual auto xentara::process::Task::prepareStartup ( const ExecutionContext & context ) -> Status

virtual

Called by the framework once at the beginning of the startup stage.

Default Implementation: The default implementation returns Status::Pending.

Parameters

context A context that allows access to time stamps, counters, etc.

Returns: The execution status for the current stage.

Reimplemented in xentara::process::StageAgnosticTask.

◆ schedule()

virtual auto xentara::process::Task::schedule	(	const Track &	track,
		std::optional< TimerSchedule >	timerSchedule
	)		-> void

virtual

Called by the framework when the task is scheduled in an execution pipeline.

Note: This function may be called multiple times of the task is added to multiples timers and/or event.

Default Implementation: The default implementation does nothing.

Parameters

track	The track that the pipeline belongs to. This is an opaque reference, but its address can be used to identify the track that the task is being scheduled to. This is useful, e.g., to check whether two tasks have been scheduled to run in different tracks, or whether the same task is being scheduled to more than one track.
timerSchedule	The schedule of the timer, or std::nullopt if the task is being added to an event.

Exceptions

std::exception An exception of this type can be thrown if the scheduling is not acceptable. You can throw an exception of this type if two tasks that need to be in the same track are scheduled in different tracks.

◆ shutdown()

virtual auto xentara::process::Task::shutdown ( const ExecutionContext & context ) -> Status

virtual

Called by the framework to perform the shutdown stage.

Default Implementation: The default implementation returns Status::Completed.

Parameters

context A context that allows access to time stamps, counters, etc.

Returns: The execution status for the current stage.

Reimplemented in xentara::process::StageAgnosticTask.

◆ stages()

virtual auto xentara::process::Task::stages ( ) const -> Stages

virtual

Called by the framework to determine which stages the task implements.

The flags for Stage::Operational, Stage::Suspended, and Stage::Terminated are ignored. All tasks are required to implement the operational stage, and the suspended and terminated stages cannot be implemented.

Default Implementation: The default implementation returns Stage::Operational.

Reimplemented in xentara::process::StageAgnosticTask.

◆ startup()

virtual auto xentara::process::Task::startup ( const ExecutionContext & context ) -> Status

virtual

Called by the framework to perform the startup stage.

Default Implementation: The default implementation returns Status::Completed.

Parameters

context A context that allows access to time stamps, counters, etc.

Returns: The execution status for the current stage.

Reimplemented in xentara::process::StageAgnosticTask.

◆ timing()

virtual auto xentara::process::Task::timing ( ) const -> Timing

virtual

Called by the framework to get the timing requirements.

Default Implementation: The default implementation returns Timing::Conventional.

Member Data Documentation

◆ kReconnect

const std::string_view xentara::process::Task::kReconnect

static

The standard name for the reconnect task of an I/O component.

Public Types

Public Member Functions

Static Public Attributes

Detailed Description

Member Typedef Documentation

◆ Stages

Member Enumeration Documentation

◆ Stage

◆ Status

◆ Timing

Constructor & Destructor Documentation

◆ ~Task()

Member Function Documentation

◆ operational()

◆ postOperational()

◆ preOperational()

◆ preparePostOperational()

◆ preparePreOperational()

◆ prepareShutdown()

◆ prepareStartup()

◆ schedule()

◆ shutdown()

◆ stages()

◆ startup()

◆ timing()

Member Data Documentation

◆ kReconnect