Tiled hypercube in a table. More...

#include <TSMCubeBuff.h>

Inheritance diagram for casacore::TSMCubeBuff:

Public Member Functions
	TSMCubeBuff (TiledStMan stman, TSMFile file, const IPosition &cubeShape, const IPosition &tileShape, const Record &values, Int64 fileOffset, uInt bufferSize)
	Construct the hypercube using the given file with the given shape. More...

	TSMCubeBuff (TiledStMan *stman, AipsIO &ios, uInt bufferSize)
	Reconstruct the hypercube by reading its data from the AipsIO stream. More...

virtual	~TSMCubeBuff ()

virtual void	flushCache ()
	Flush the data in the cache. More...

virtual void	showCacheStatistics (ostream &os) const
	Show the cache statistics. More...

virtual void	setShape (const IPosition &cubeShape, const IPosition &tileShape)
	Set the hypercube shape. More...

virtual void	extend (uInt64 nr, const Record &coordValues, const TSMColumn *lastCoordColumn)
	Extend the last dimension of the cube with the given number. More...

virtual void	accessSection (const IPosition &start, const IPosition &end, char *section, uInt colnr, uInt localPixelSize, uInt externalPixelSize, Bool writeFlag)
	Read or write a section in the cube. More...

virtual void	accessStrided (const IPosition &start, const IPosition &end, const IPosition &stride, char *section, uInt colnr, uInt localPixelSize, uInt externalPixelSize, Bool writeFlag)
	Read or write a section in a strided way. More...

virtual void	setCacheSize (const IPosition &sliceShape, const IPosition &windowStart, const IPosition &windowLength, const IPosition &axisPath, Bool forceSmaller, Bool userSet)
	Set the cache size for the given slice and access path. More...

virtual void	setCacheSize (uInt cacheSize, Bool forceSmaller, Bool userSet)
	Resize the cache object. More...

Public Member Functions inherited from casacore::TSMCube
	TSMCube (TiledStMan stman, TSMFile file, const IPosition &cubeShape, const IPosition &tileShape, const Record &values, Int64 fileOffset, Bool useDerived=False)
	Construct the hypercube using the given file with the given shape. More...

	TSMCube (TiledStMan *stman, AipsIO &ios, Bool useDerived=False)
	Reconstruct the hypercube by reading its data from the AipsIO stream. More...

virtual	~TSMCube ()

void	clearCache (Bool doFlush=True)
	Clear the cache, so data will be reread. More...

void	emptyCache ()
	Empty the cache. More...

void	putObject (AipsIO &ios)
	Put the data of the object into the AipsIO stream. More...

Int	getObject (AipsIO &ios)
	Get the data of the object from the AipsIO stream. More...

virtual void	resync (AipsIO &ios)
	Resync the object with the data file. More...

Bool	isExtensible () const
	Is the hypercube extensible? More...

uInt	bucketSize () const
	Get the bucket size (bytes). More...

uInt	localTileLength () const
	Get the length of a tile (in bytes) in local format. More...

const IPosition &	cubeShape () const
	Get the shape of the hypercube. More...

const IPosition &	tileShape () const
	Get the shape of the tiles. More...

IPosition	cellShape () const
	Get the shape of the data cells in the cube. More...

uInt	coordinateSize (const String &coordinateName) const
	Get the size of a coordinate (i.e. More...

const Record &	valueRecord () const
	Get the record containing the id and coordinate values. More...

Record &	rwValueRecord ()

Bool	matches (const PtrBlock< TSMColumn * > &idColSet, const Record &idValues)
	Test if the id values match. More...

void	extendCoordinates (const Record &coordValues, const String &coordName, uInt length)
	Extend the coordinates vector for the given coordinate to the given length with the given coordValues. More...

uInt	cacheSize () const
	Get the current cache size (in buckets). More...

uInt	calcCacheSize (const IPosition &sliceShape, const IPosition &windowStart, const IPosition &windowLength, const IPosition &axisPath) const
	Calculate the cache size (in buckets) for the given slice and access path. More...

uInt	validateCacheSize (uInt cacheSize) const
	Validate the cache size (in buckets). More...

Bool	userSetCache () const
	Determine if the user set the cache size (using setCacheSize). More...

AccessType	getLastColAccess () const
	Functions for TSMDataColumn to keep track of the last type of access to a hypercube. More...

const IPosition &	getLastColSlice () const

void	setLastColAccess (AccessType type)

void	setLastColSlice (const IPosition &slice)

Private Member Functions
	TSMCubeBuff (const TSMCubeBuff &)
	Forbid copy constructor. More...

TSMCubeBuff &	operator= (const TSMCubeBuff &)
	Forbid assignment. More...

BucketBuffered *	getCache ()
	Get the cache object. More...

virtual void	makeCache ()
	Construct the cache object (if not constructed yet). More...

virtual void	resyncCache ()
	Resync the cache object. More...

virtual void	deleteCache ()
	Delete the cache object. More...

Private Attributes
BucketBuffered *	cache_p
	The bucket cache. More...

uInt	bufferSize_p
	The buffer size to use. More...

Additional Inherited Members
Public Types inherited from casacore::TSMCube
enum	AccessType { NoAccess, CellAccess, SliceAccess, ColumnAccess, ColumnSliceAccess }
	Define the possible access types for TSMDataColumn. More...

Static Public Member Functions inherited from casacore::TSMCube
static uInt	calcCacheSize (const IPosition &cubeShape, const IPosition &tileShape, Bool extensible, const IPosition &sliceShape, const IPosition &windowStart, const IPosition &windowLength, const IPosition &axisPath, uInt maxCacheSizeMiB, uInt bucketSize)

static uInt	validateCacheSize (uInt cacheSize, uInt maxSizeMiB, uInt bucketSize)

Protected Member Functions inherited from casacore::TSMCube
void	setup ()
	Initialize the various variables. More...

void	setupNrTiles ()

IPosition	adjustTileShape (const IPosition &cubeShape, const IPosition &tileShape) const
	Adjust the tile shape to the hypercube shape. More...

void	resizeTileSections ()
	Resize the IPosition member variables used in accessSection() if nrdim_p changes value. More...

Protected Attributes inherited from casacore::TSMCube
char *	cachedTile_p

TiledStMan *	stmanPtr_p
	Pointer to the parent storage manager. More...

Bool	useDerived_p
	Is the class used directly or only by a derived class only? More...

Record	values_p
	The values of the possible id and coordinate columns. More...

Bool	extensible_p
	Is the hypercube extensible? More...

uInt	nrdim_p
	Dimensionality of the hypercube. More...

uInt	nrTiles_p
	Number of tiles in the hypercube. More...

IPosition	cubeShape_p
	The shape of the hypercube. More...

IPosition	tileShape_p
	The shape of the tiles in the hypercube. More...

IPosition	tilesPerDim_p
	The number of tiles in each hypercube dimension. More...

TSMShape	expandedTileShape_p
	Precomputed tileShape information. More...

TSMShape	expandedTilesPerDim_p
	Precomputed tilesPerDim information. More...

uInt	nrTilesSubCube_p
	Number of tiles in all but last dimension (used when extending). More...

uInt	tileSize_p
	The tilesize in bytes. More...

TSMFile *	filePtr_p
	Pointer to the TSMFile object holding the data. More...

Int64	fileOffset_p
	Offset in the TSMFile object where the data of this hypercube starts. More...

Block< uInt >	externalOffset_p
	Offset for each data column in a tile (in external format). More...

Block< uInt >	localOffset_p
	Offset for each data column in a tile (in local format). More...

uInt	bucketSize_p
	The bucket size in bytes (is equal to tile size in bytes). More...

uInt	localTileLength_p
	The tile size in bytes in local format. More...

BucketCache *	cache_p
	The bucket cache. More...

Bool	userSetCache_p
	Did the user set the cache size? More...

AccessType	lastColAccess_p
	Was the last column access to a cell, slice, or column? More...

IPosition	lastColSlice_p
	The slice shape of the last column access to a slice. More...

IPosition	nrTileSection_p
	IPosition variables used in accessSection(); declared here as member variables to avoid significant construction and desctruction overhead if they are local to accessSection() #tiles needed for the section. More...

IPosition	startTile_p
	First tile needed. More...

IPosition	endTile_p
	Last tile needed. More...

IPosition	startPixelInFirstTile_p
	First pixel in first tile. More...

IPosition	endPixelInFirstTile_p
	Last pixel in first tile. More...

IPosition	endPixelInLastTile_p
	Last pixel in last tile. More...

Detailed Description

Tiled hypercube in a table.

Intended use:

Internal

Review Status

Reviewed By:: UNKNOWN
Date Reviewed:: before2004/08/25

Prerequisite

TiledStMan
ROTiledStManAccessor for a discussion of the maximum cache size
TSMFile
BucketBuffered

Etymology

TSMCubeBuff represents a hypercube in the Tiled Storage Manager.

Synopsis

TSMCubeBuff defines a tiled hypercube. The data is stored in a TSMFile object and accessed using a BucketBuffered object. The hypercube can be extensible in its last dimension to support tables with a size which is not known in advance.
Normally hypercubes share the same TSMFile object, but extensible hypercubes have their own TSMFile object (to be extensible). If the hypercolumn has multiple data columns, their cells share the same tiles. Per tile data column A appears first, thereafter B, etc..
The data in the cache is held in external format and is converted when accessed. The alternative would be to hold it in the cache in local format and convert it when read/written from the file. It was felt that the latter approach would generate more needless conversions.

The possible id and coordinate values are stored in a Record object. They are written in the main hypercube AipsIO file.

TSMCubeBuff uses the maximum cache size set for a Tiled Storage manager. The description of class ROTiledStManAccessor contains a discussion about the effect of setting the maximum cache size.

Motivation

TSMCubeBuff encapsulates all operations on a hypercube.

Definition at line 97 of file TSMCubeBuff.h.

Constructor & Destructor Documentation

casacore::TSMCubeBuff::TSMCubeBuff	(	TiledStMan *	stman,
		TSMFile *	file,
		const IPosition &	cubeShape,
		const IPosition &	tileShape,
		const Record &	values,
		Int64	fileOffset,
		uInt	bufferSize
	)

Construct the hypercube using the given file with the given shape.

The record contains the id and possible coordinate values.
If the cubeshape is empty, the hypercube is still undefined and can be added later with setShape. That is only used by TiledCellStMan.
The fileOffset argument is meant for class TiledFileAccess.

casacore::TSMCubeBuff::TSMCubeBuff	(	TiledStMan *	stman,
		AipsIO &	ios,
		uInt	bufferSize
	)

Reconstruct the hypercube by reading its data from the AipsIO stream.

It will link itself to the correct TSMFile. The TSMFile objects must have been reconstructed in advance.

virtual casacore::TSMCubeBuff::~TSMCubeBuff ( )

virtual

casacore::TSMCubeBuff::TSMCubeBuff ( const TSMCubeBuff & )

private

Forbid copy constructor.

Member Function Documentation

virtual void casacore::TSMCubeBuff::accessSection	(	const IPosition &	start,
		const IPosition &	end,
		char *	section,
		uInt	colnr,
		uInt	localPixelSize,
		uInt	externalPixelSize,
		Bool	writeFlag
	)

virtual

Read or write a section in the cube.

It is assumed that the section buffer is long enough.

Reimplemented from casacore::TSMCube.

virtual void casacore::TSMCubeBuff::accessStrided	(	const IPosition &	start,
		const IPosition &	end,
		const IPosition &	stride,
		char *	section,
		uInt	colnr,
		uInt	localPixelSize,
		uInt	externalPixelSize,
		Bool	writeFlag
	)

virtual

Read or write a section in a strided way.

It is assumed that the section buffer is long enough.

Reimplemented from casacore::TSMCube.

virtual void casacore::TSMCubeBuff::deleteCache ( )

privatevirtual

Delete the cache object.

Reimplemented from casacore::TSMCube.

virtual void casacore::TSMCubeBuff::extend	(	uInt64	nr,
		const Record &	coordValues,
		const TSMColumn *	lastCoordColumn
	)

virtual

Extend the last dimension of the cube with the given number.

The record can contain the coordinates of the elements added.

Reimplemented from casacore::TSMCube.

virtual void casacore::TSMCubeBuff::flushCache ( )

virtual

Flush the data in the cache.

Reimplemented from casacore::TSMCube.

BucketBuffered * casacore::TSMCubeBuff::getCache ( )

inlineprivate

Get the cache object.

This will construct the cache object if not present yet.

Definition at line 193 of file TSMCubeBuff.h.

References cache_p, and makeCache().

virtual void casacore::TSMCubeBuff::makeCache ( )

privatevirtual

Construct the cache object (if not constructed yet).

Reimplemented from casacore::TSMCube.

Referenced by getCache().

TSMCubeBuff& casacore::TSMCubeBuff::operator= ( const TSMCubeBuff & )

private

Forbid assignment.

virtual void casacore::TSMCubeBuff::resyncCache ( )

privatevirtual

Resync the cache object.

Reimplemented from casacore::TSMCube.

virtual void casacore::TSMCubeBuff::setCacheSize	(	const IPosition &	sliceShape,
		const IPosition &	windowStart,
		const IPosition &	windowLength,
		const IPosition &	axisPath,
		Bool	forceSmaller,
		Bool	userSet
	)

virtual

Set the cache size for the given slice and access path.

Reimplemented from casacore::TSMCube.

virtual void casacore::TSMCubeBuff::setCacheSize	(	uInt	cacheSize,
		Bool	forceSmaller,
		Bool	userSet
	)

virtual

Resize the cache object.

If forceSmaller is False, the cache will only be resized when it grows. If the given size exceeds the maximum size with more than 10%, the maximum size will be used. The cacheSize has to be given in buckets.
The flag userSet inidicates if the cache size is set by the user (by an Accessor object) or automatically (by TSMDataColumn).

Reimplemented from casacore::TSMCube.

virtual void casacore::TSMCubeBuff::setShape	(	const IPosition &	cubeShape,
		const IPosition &	tileShape
	)

virtual

Set the hypercube shape.

This is only possible if the shape was not defined yet.

Reimplemented from casacore::TSMCube.

virtual void casacore::TSMCubeBuff::showCacheStatistics ( ostream & os ) const

virtual

Show the cache statistics.

Reimplemented from casacore::TSMCube.

Member Data Documentation

uInt casacore::TSMCubeBuff::bufferSize_p

private

The buffer size to use.

Definition at line 188 of file TSMCubeBuff.h.

BucketBuffered* casacore::TSMCubeBuff::cache_p

private

The bucket cache.

Definition at line 186 of file TSMCubeBuff.h.

Referenced by getCache().

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

tables/DataMan/TSMCubeBuff.h

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Intended use:

Review Status

Prerequisite

Etymology

Synopsis

Motivation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation