dueca::ActivityCallback Class Reference

The most common type of activity, one which uses a GenericCallback object to call something. More...

#include <Activity.hxx>

Inheritance diagram for dueca::ActivityCallback:

Collaboration diagram for dueca::ActivityCallback:

Public Member Functions
	ActivityCallback (const GlobalId &owner, const char *my_name, GenericCallback *f, const PrioritySpec &spec)
	Constructor.
	~ActivityCallback ()
	Destructor.
Public Member Functions inherited from dueca::Activity
	Activity (const GlobalId &owner, const char *my_name, const PrioritySpec &s)
	Constructor.
virtual	~Activity ()
	Destructor.
void	switchOn (const TimeTickType &time=0)
	Specify the time from which the Activity is switched on.
void	switchOff (const TimeTickType &time=0)
	Specify the time when this Activity should be switched off.
void	switchOn (const TimeSpec &time)
	Specify the time from which the Activity is switched on.
void	switchOff (const TimeSpec &time)
	Specify the time when this Activity should be switched off.
void	setTimeSpec (const TimeSpec &ts)
	Supply a periodic time specification to the activity.
void	changePriority (const PrioritySpec &s)
	Change the priority spec.
void	print (ostream &os)
	Print to stream, for debugging purposes.
int	noScheduledBehind () const
	Find out how many more instances of this activity are scheduled.
int	numScheduledBehind () const
	Find out how many more instances of this activity are scheduled.
TimingCheck *	getCheck ()
	Return a pointer to the check associated with this activity.
const vstring &	getName () const
	Return the name of the activity.
const std::string &	getTargetName () const
	As an activity target.
void	logBlockingWait ()
	If your activity does blocking waits (file io etc.), it might be neat to report that, so that logging facilities can correctly interpret run times.
void	logBlockingWaitOver ()
	Report that the blocking wait is over.
bool	firstCycle (const TimeSpec &ts=TimeSpec(0, 0))
	Is this the first run after the activity has been switched on?
bool	lastCycle (const TimeSpec &ts=TimeSpec(0, 0))
	Is this the last cycle before the activity will be switched off?
bool	isBraking ()
	Indicate that the system has been commanded to stop.

Friends
class	ActivityItem
	Only an ActivityItem may use despatch.

Additional Inherited Members
Public Types inherited from dueca::Activity
enum	RunState {   Off , Last , Ready , Braking ,   Running , ReadyWork , FirstWork , RunningWork ,   BrakingWork , LastWork }
	To track the run state, and signal about first/last/work etc. More...
Public Attributes inherited from dueca::Activity
GlobalId	owner
	Owner of this activity.
int	activity_id
	Integer handle, unique within a node.
PrioritySpec	prio_spec
	Priority of the activity.
RunState	run_state
	Runstate of the activity, to save cycles on switch logic.
TimeTickType	switch_on
	Indicates the time from which this activity is switched on.
TimeTickType	switch_off
	Indicates the time until which this activity is switched on.
PeriodicTimeSpec *	time_spec
	Periodic timing specification for this activity.
TimingCheck *	check
	Pointer to a TimingCheck object.
ActivityManager *	my_manager
	A pointer to this activity's ActivityManager.
int	no_schedules
	Count of the number of times the activity has been scheduled.
int	no_despatches
	Count of the number of times the activity has been run.
vstring	name
	string format name.
Protected Member Functions inherited from dueca::Activity
int	getOrder () const
	Return the "order" part of the priority.
const GlobalId &	getOwner ()
	Return the id of the owner of the activity.
bool	isInRunPeriod (const DataTimeSpec &ts)
	Test whether activation is appropriate.
DataTimeSpec	trimToRunPeriod (const DataTimeSpec &ts)
	Trim a time spec to the run period.
unsigned int	getDescriptionId () const
	Return the id of the activity.
void	trigger (const DataTimeSpec &t, unsigned idx)
	Override of the trigger method from the TriggerTarget class.

Detailed Description

The most common type of activity, one which uses a GenericCallback object to call something.

Use objects of this class if you want to "do" something in a DUECA process. The common use is to create a Callback object which calls back a function in your class, and then create an ActivityCallback object that takes the Callback object as an argument. Then, as needed, switch the Activity on and off, and supply a PeriodicTimeSpec to your own taste.

In your header

Callback<MyClass>     cb;
ActivityCallback      my_activity;

In the initialisation list of your constructor:

cb(this, &MyClass::OneOfMyFunctions),
my_activity(getId(), "my activity", &cb, priority_spec),

Where OneOfMyFunctions has to have the following type:

void OneOfMyFunctions(const TimeSpec& ts);

Commonly used member functions are:

• Activity::switchOn, Activity::switchOff, for controlling the Activity
• TriggerTarget::setTrigger, defines wich events trigger the Activity
• Activity::setTimeSpec, specify periodic invocation

Constructor & Destructor Documentation

ActivityCallback()

dueca::ActivityCallback::ActivityCallback	(	const GlobalId &	owner,
		const char *	my_name,
		GenericCallback *	f,
		const PrioritySpec &	spec )

Constructor.

Constructing an ActivityCallback object is a metafor for allocating/requesting thread of control from DUECA.

Parameters

owner	Your own id
my_name	A name (character string) for the Activity
f	GenericCallback object
spec	Priority specification.

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The documentation for this class was generated from the following file:

• /home/abuild/rpmbuild/BUILD/dueca-4.1.3/dueca/Activity.hxx