cScheduler Class Reference

Description

Abstract class to encapsulate event scheduling.

The central method is takeNextEvent().

To switch to your own scheduler class (reasons you'd like to do that include real-time simulation, hardware-in-the-loop simulation, distributed (federated) simulation, parallel distributed simulation), subclass cScheduler, register your new class with the Register_Class() macro, then add the following to omnetpp.ini:

[General]
scheduler-class = "MyClass"

Inheritance diagram for cScheduler:

Public Member Functions
	cScheduler ()
virtual	~cScheduler ()
virtual std::string	str () const override
virtual void	setSimulation (cSimulation *_sim)
cSimulation *	getSimulation () const
virtual void	startRun ()
virtual void	endRun ()
virtual void	executionResumed ()
virtual cEvent *	guessNextEvent ()=0
virtual cEvent *	takeNextEvent ()=0
virtual void	putBackEvent (cEvent *event)=0
Public Member Functions inherited from cObject
	cObject ()
	cObject (const cObject &other)=default
virtual	~cObject ()
virtual const char *	getClassName () const
virtual const char *	getName () const
bool	isName (const char *s) const
virtual const char *	getFullName () const
virtual std::string	getFullPath () const
virtual std::string	getClassAndFullName () const
virtual std::string	getClassAndFullPath () const
const cObject *	getThisPtr () const
virtual std::ostream &	printOn (std::ostream &os) const
virtual cObject *	dup () const
virtual void	parsimPack (cCommBuffer *buffer) const
virtual void	parsimUnpack (cCommBuffer *buffer)
virtual cObject *	getOwner () const
virtual bool	isOwnedObject () const
virtual bool	isSoftOwner () const
virtual void	forEachChild (cVisitor *v)
cObject *	findObject (const char *name, bool deep=true)
virtual cClassDescriptor *	getDescriptor () const
void	copyNotSupported () const
Public Member Functions inherited from cISimulationLifecycleListener
virtual	~cISimulationLifecycleListener ()
virtual void	listenerAdded ()
virtual void	listenerRemoved ()

Protected Member Functions
virtual void	lifecycleEvent (SimulationLifecycleEventType eventType, cObject *details) override
Protected Member Functions inherited from cObject
virtual void	take (cOwnedObject *obj)
virtual void	drop (cOwnedObject *obj)
void	dropAndDelete (cOwnedObject *obj)

Additional Inherited Members
Static Public Member Functions inherited from cISimulationLifecycleListener
static const char *	getSimulationLifecycleEventName (SimulationLifecycleEventType eventType)

Constructor & Destructor Documentation

cScheduler()

cScheduler ( )

inline

Constructor.

~cScheduler()

virtual ~cScheduler ( )

inlinevirtual

Destructor.

Member Function Documentation

lifecycleEvent()

virtual void lifecycleEvent ( SimulationLifecycleEventType  eventType, cObject *  details  )

overrideprotectedvirtual

A cISimulationLifecycleListener method. Delegates to startRun(), endRun() and executionResumed(); override if needed.

Implements cISimulationLifecycleListener.

str()

virtual std::string str ( ) const

overridevirtual

Return a short description. This string will be displayed in Qtenv as scheduler information. Returning an empty string means "default scheduler", and is reserved for cSequentialScheduler.

Reimplemented from cObject.

Reimplemented in cRealTimeScheduler, and cSequentialScheduler.

setSimulation()

virtual void setSimulation ( cSimulation *  _sim )

virtual

Pass cSimulation object to scheduler.

getSimulation()

cSimulation* getSimulation ( ) const

inline

Returns the simulation the scheduler belongs to.

startRun()

virtual void startRun ( )

inlinevirtual

Called at the beginning of a simulation run.

Reimplemented in cRealTimeScheduler.

endRun()

virtual void endRun ( )

inlinevirtual

Called at the end of a simulation run.

executionResumed()

virtual void executionResumed ( )

inlinevirtual

Called every time the user hits the Run button in Qtenv. Real-time schedulers (e.g. cRealTimeScheduler) may make use of this callback to pin current simulation time to current wall clock time.

Reimplemented in cRealTimeScheduler.

guessNextEvent()

virtual cEvent* guessNextEvent ( )

pure virtual

Return the likely next event in the simulation. This method is for UI purposes, it does not play any role in the simulation. A basic implementation would just return a pointer to the first event in the FES, which is accurate for sequential simulation; with parallel, distributed or real-time simulation there might be other events coming from other processes with a yet smaller timestamp.

This method should not have side effects, except for discarding stale events from the FES.

Implemented in cRealTimeScheduler, and cSequentialScheduler.

takeNextEvent()

virtual cEvent* takeNextEvent ( )

pure virtual

Return the next event to be processed. Normally (with sequential execution), it just returns the first event in the FES. With parallel and/or real-time simulation, it is also the scheduler's task to synchronize with real time and/or with other partitions.

If there's no more event, it throws cTerminationException.

A nullptr return value means that there's no error but execution was stopped by the user (e.g. with STOP button on the GUI) while takeNextEvent() was waiting for external synchronization.

Implemented in cRealTimeScheduler, and cSequentialScheduler.

putBackEvent()

virtual void putBackEvent ( cEvent *  event )

pure virtual

Undo for takeNextEvent(), approximately: if an event was obtained from takeNextEvent() but was not yet processed, it is possible to temporarily put it back to the FES.

The scheduler class must guarantee that removing the event via takeNextEvent() again does NOT repeat the side effects of the first takeNextEvent()! That is, the sequence

e = takeNextEvent();
putBackEvent(e);
e = takeNextEvent();

should be equivalent to a single takeNextEvent() call.

Implemented in cRealTimeScheduler, and cSequentialScheduler.

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

• cscheduler.h