A filter to combine successive matching samples into a 'repeat count'. More...

#include <RepeatFilter.h>

Inheritance diagram for RepeatFilter:

Public Member Functions
	RepeatFilter (const EngineConfig &config, ProcessVariable &pv, ProcessVariableListener *listener)
	Create new filter, using config for max. More...

virtual	~RepeatFilter ()

void	stop ()
	It's suggested to stop the filter when sampling stops, since this flushes accumulated repeats.

void	pvConnected (ProcessVariable &pv, const epicsTime &when)
	React to connection, then pass on to listener. More...

void	pvDisconnected (ProcessVariable &pv, const epicsTime &when)
	React to disconnect, then pass on to listener. More...

void	pvValue (ProcessVariable &pv, const RawValue::Data *data)
	React to new value and filter it. More...

void	update (const epicsTime &now)
	SampleMechanismMonitoredGet uses this to trigger repeat counts in case the ProcessVariableListener does not receive anything because the PV simply doesn't change.

Public Member Functions inherited from ProcessVariableFilter
	ProcessVariableFilter (ProcessVariableListener *listener)
	Create a PV filter which passes filtered events on to the provided listener.

Public Member Functions inherited from ProcessVariableStateListener
virtual	~ProcessVariableStateListener ()
	Constructor.

Detailed Description

A filter to combine successive matching samples into a 'repeat count'.

Used in two ways: Simply driven by a periodic 'get' on the PV, which results in a periodic pvValue() event. Or driven by a subscription to the PV, which results in unpredictable pvValue() events. So in addition, update() is called periodically, allowing the filter to add repeat counts in the absence of PV events.

Constructor & Destructor Documentation

RepeatFilter::RepeatFilter	(	const EngineConfig &	config,
		ProcessVariable &	pv,
		ProcessVariableListener *	listener
	)

Create new filter, using config for max.

repeat count.

virtual RepeatFilter::~RepeatFilter ( )

virtual

See Also: flushRepeats()

Member Function Documentation

void RepeatFilter::pvConnected	(	ProcessVariable &	pv,
		const epicsTime &	when
	)

virtual

React to connection, then pass on to listener.

See Also: ProcessVariableListener

Reimplemented from ProcessVariableFilter.

void RepeatFilter::pvDisconnected	(	ProcessVariable &	pv,
		const epicsTime &	when
	)

virtual

React to disconnect, then pass on to listener.

See Also: ProcessVariableListener

Reimplemented from ProcessVariableFilter.

void RepeatFilter::pvValue	(	ProcessVariable &	pv,
		const RawValue::Data *	data
	)

virtual

React to new value and filter it.

Might invoke listener with the value, another value, or not at all.

See Also: ProcessVariableListener

Reimplemented from ProcessVariableFilter.

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

/home/malitsky/projects/epics-archiver/sourceforge/trunk/ea4-cpp/include/common/engine/RepeatFilter.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation