An object to manage the caches of pre-computed convolution functions on the disk and in the memory. More...

#include <ConvFuncDiskCache.h>

Public Member Functions
	ConvFuncDiskCache ()
ConvFuncDiskCache &	operator= (const ConvFuncDiskCache &other)
	~ConvFuncDiskCache ()
void	setCacheDir (const char *dir)
void	initCache ()
void	cacheConvFunction (Int which, Float pa, Array< Complex > &cf, CoordinateSystem &coords, CoordinateSystem &ftcoords, Int &convSize, Cube< Int > &convSupport, Float convSampling, String nameQualifier="", Bool savePA=True)
void	cacheWeightsFunction (Int which, Float pa, Array< Complex > &cfWt, CoordinateSystem &coords, Int &convSize, Cube< Int > &convSupport, Float convSampling)
Bool	searchConvFunction (const VisBuffer &vb, VPSkyJones &vpSJ, Int &which, Float &pa)
Bool	searchConvFunction (const VisBuffer &vb, ParAngleChangeDetector &vpSJ, Int &which, Float &pa)
Bool	loadConvFunction (Int where, Int Nx, PtrBlock< Array< Complex > * > &convFuncCache, Cube< Int > &convSupport, Vector< Float > &convSampling, Double &cfRefFreq, CoordinateSystem &coordys, String prefix="/CF")
void	finalize ()
void	finalize (ImageInterface< Float > &avgPB)
void	loadAvgPB (ImageInterface< Float > &avgPB)
Private Attributes
Vector< Float >	paList
Vector< Float >	Sampling
Cube< Int >	XSup
Cube< Int >	YSup
String	Dir
String	cfPrefix
String	aux

Detailed Description

An object to manage the caches of pre-computed convolution functions on the disk and in the memory.

Intended use:

Public interface

Prerequisite

pre-requisites.

Etymology

ConvFuncDiskCache is an object, to write convolution functions from the memory cache to the disk cache, and search/load the disk cache for convolution functions for a give Parallactic Angle.

Synopsis

FTMachines uses pre-computed convolution functions for gridding (FTMachine::put()) and prediction (FTMachine::get()). For PBWProjectFT , the convolution function computation is expensive. Once computed, it is efficient to cache these functions as a function of Parallactic Angle and the value of the w-term (if significant).

ConvFuncDiskCache class provides interface to the disk cache and is used in PBWProjectFT to search and load convolution functions from the disk. If a new convolution function is computed in PBWProjectFT , the disk cache is updated using the services of this class as well.

Example

Motivation

Factor out the code for managing convolution function caches (memory and disk caches) from the FTMachine code. This is a specialized service, and has nothing to do with the details of gridding and prediction of visibilities (which is the function of FTMachines).

Definition at line 107 of file ConvFuncDiskCache.h.

Constructor & Destructor Documentation

casa::ConvFuncDiskCache::ConvFuncDiskCache ( ) [inline]

Definition at line 110 of file ConvFuncDiskCache.h.

casa::ConvFuncDiskCache::~ConvFuncDiskCache ( ) [inline]

Definition at line 112 of file ConvFuncDiskCache.h.

Member Function Documentation

void casa::ConvFuncDiskCache::cacheConvFunction	(	Int	which,
		Float	pa,
		Array< Complex > &	cf,
		CoordinateSystem &	coords,
		CoordinateSystem &	ftcoords,
		Int &	convSize,
		Cube< Int > &	convSupport,
		Float	convSampling,
		String	nameQualifier = `""`,
		Bool	savePA = `True`
	)

void casa::ConvFuncDiskCache::cacheWeightsFunction	(	Int	which,
		Float	pa,
		Array< Complex > &	cfWt,
		CoordinateSystem &	coords,
		Int &	convSize,
		Cube< Int > &	convSupport,
		Float	convSampling
	)

void casa::ConvFuncDiskCache::finalize ( )

void casa::ConvFuncDiskCache::finalize ( ImageInterface< Float > & avgPB )

void casa::ConvFuncDiskCache::initCache ( )

void casa::ConvFuncDiskCache::loadAvgPB ( ImageInterface< Float > & avgPB )

Bool casa::ConvFuncDiskCache::loadConvFunction	(	Int	where,
		Int	Nx,
		PtrBlock< Array< Complex > * > &	convFuncCache,
		Cube< Int > &	convSupport,
		Vector< Float > &	convSampling,
		Double &	cfRefFreq,
		CoordinateSystem &	coordys,
		String	prefix = `"/CF"`
	)