TailReaderPtr Class Reference

A reader that only ever reads the last N samples, subsequent calls may result in overlapping data. More...

Inheritance diagram for TailReaderPtr:

Collaboration diagram for TailReaderPtr:

Detailed Description

A reader that only ever reads the last N samples, subsequent calls may result in overlapping data.

Public Member Functions
daq::TailReaderStatusPtr	read (void *values, daq::SizeT *count) const
	Copies at maximum the next count unread samples to the values buffer. The amount actually read is returned through the count parameter. More...
daq::TailReaderStatusPtr	readWithDomain (void *values, void *domain, daq::SizeT *count) const
	Copies at maximum the next count unread samples and clock-stamps to the values and stamps buffers. The amount actually read is returned through the count parameter. More...
daq::SizeT	getHistorySize () const
	The maximum amount of samples in history to keep. More...
Public Member Functions inherited from GenericSampleReaderPtr< ITailReader >
daq::SampleType	getValueReadType () const
	Gets the sample-type the signal value samples will be converted to when read or SampleType::Invalid if read-type has not been determined yet. More...
daq::SampleType	getDomainReadType () const
	Gets the sample-type the signal domain samples will be converted to when read or SampleType::Invalid if read-type has not been determined yet. More...
void	setValueTransformFunction (const daq::FunctionPtr &transform) const
	Sets the transform function that will be called with the read value-data and currently valid Signal-Descriptor giving the user the chance add a custom post-processing step. The function should have a signature compatible with: More...
void	setDomainTransformFunction (const daq::FunctionPtr &transform) const
	Sets the transform function that will be called with the read domain-data and currently valid Signal-Descriptor giving the user the chance add a custom post-processing step. The function should have a signature compatible with: More...
daq::ReadMode	getReadMode () const
	Gets the reader's read mode which determines if the reader will also scale the read data or not. More...
Public Member Functions inherited from GenericReaderPtr< InterfaceType >
daq::SizeT	getAvailableCount () const
	Gets the number of segments available to read. More...
void	setOnDataAvailable (const daq::ProcedurePtr &callback) const
	Sets the specified callback function to be called when there is available data in the reader. Pass nullptr to unset the callback. The callback should take no arguments. More...
daq::Bool	getEmpty () const
	Checks if there is data to read. More...