Abstract base class for a data manager. More...

#include <DataManager.h>

Inheritance diagram for casa::DataManager:

Public Member Functions
	DataManager ()
	Default constructor.
virtual	~DataManager ()
virtual DataManager *	clone () const =0
	Make a clone of the derived object.
virtual String	dataManagerName () const
	Return the name of the data manager.
virtual String	dataManagerType () const =0
	Return the type name of the data manager (in fact its class name).
void	dataManagerInfo (Record &info) const
	Add SEQNR and SPEC (the DataManagerSpec subrecord) to the info.
virtual Record	dataManagerSpec () const
	Return a record containing data manager specifications.
virtual Record	getProperties () const
	Get data manager properties that can be modified.
virtual void	setProperties (const Record &spec)
	Modify data manager properties given in record fields.
virtual Bool	isStorageManager () const
	Is the data manager a storage manager? The default is yes.
virtual Bool	canReallocateColumns () const
	Tell if the data manager wants to reallocate the data manager column objects.
virtual DataManagerColumn *	reallocateColumn (DataManagerColumn *column)
	Reallocate the column object if it is part of this data manager.
uInt	sequenceNr () const
	Get the (unique) sequence nr of this data manager.
uInt	ncolumn () const
	Get the nr of columns in this data manager (can be zero).
Bool	asBigEndian () const
	Have the data to be stored in big or little endian canonical format?
const TSMOption &	tsmOption () const
	Get the TSM option.
String	keywordName (const String &keyword) const
	Compose a keyword name from the given keyword appended with the sequence number (e.g.
String	fileName () const
	Compose a unique filename from the table name and sequence number.
ByteIO::OpenOption	fileOption () const
	Get the AipsIO option of the underlying file.
virtual Bool	isRegular () const
	Is this a regular storage manager? It is regular if it allows addition of rows and writing dara in them.
Table &	table () const
	Get the table this object is associated with.
virtual void	reopenRW ()
	Reopen the data manager for read/write access.
virtual Bool	canAddRow () const
	Does the data manager allow to add rows? (default no)
virtual Bool	canRemoveRow () const
	Does the data manager allow to delete rows? (default no)
virtual Bool	canAddColumn () const
	Does the data manager allow to add columns? (default no)
virtual Bool	canRemoveColumn () const
	Does the data manager allow to delete columns? (default no)
virtual void	setMaximumCacheSize (uInt nbytes)
	Set the maximum cache size (in bytes) to be used by a storage manager.
virtual void	showCacheStatistics (std::ostream &) const
	Show the data manager's IO statistics.
DataManagerColumn *	createScalarColumn (const String &columnName, int dataType, const String &dataTypeId)
	Create a column in the data manager on behalf of a table column.
DataManagerColumn *	createDirArrColumn (const String &columnName, int dataType, const String &dataTypeId)
	Create a direct array column.
DataManagerColumn *	createIndArrColumn (const String &columnName, int dataType, const String &dataTypeId)
	Create an indirect array column.
virtual void	deleteManager ()=0
	The data manager will be deleted (because all its columns are requested to be deleted).
DataManager *	getClone () const
	Has the object already been cloned?
void	setClone (DataManager *clone) const
	Set the pointer to the clone.
Static Public Member Functions
static void	registerCtor (const String &type, DataManagerCtor func)
	Register a mapping of a data manager type to its static construction function.
static DataManagerCtor	getCtor (const String &dataManagerType)
	Get the "constructor" of a data manager (thread-safe).
static Bool	isRegistered (const String &dataManagerType)
	Test if a data manager is registered (thread-safe).
static void	registerMainCtor ()
	Register the main data managers (if not done yet).
static DataManager *	unknownDataManager (const String &dataManagerType, const Record &spec)
	Serve as default function for theirRegisterMap, which catches all unknown data manager types.
Protected Member Functions
void	decrementNcolumn ()
	Decrement number of columns (in case a column is deleted).
void	setEndian (Bool bigEndian)
	Tell the data manager if big or little endian format is needed.
void	setTsmOption (const TSMOption &tsmOption)
	Tell the data manager which TSM option to use.
void	throwDataTypeOther (const String &columnName, int dataType) const
	Throw an exception in case data type is TpOther, because the storage managers (and maybe other data managers) do not support such columns.
Private Member Functions
	DataManager (const DataManager &)
	The copy constructor cannot be used for this base class.
DataManager &	operator= (const DataManager &)
	Assignment cannot be used for this base class.
virtual DataManagerColumn *	makeScalarColumn (const String &columnName, int dataType, const String &dataTypeId)=0
	Create a column in the data manager on behalf of a table column.
virtual DataManagerColumn *	makeDirArrColumn (const String &columnName, int dataType, const String &dataTypeId)=0
	Create a direct array column.
virtual DataManagerColumn *	makeIndArrColumn (const String &columnName, int dataType, const String &dataTypeId)=0
	Create an indirect array column.
void	checkDataType (const DataManagerColumn *colPtr, const String &columnName, int dataType, const String &dataTypeId) const
	Check if the data type of the created data manager column is correct.
virtual void	addRow (uInt nrrow)
	Add rows to all columns.
virtual void	removeRow (uInt rownr)
	Delete a row from all columns.
virtual void	addColumn (DataManagerColumn *)
	Add a column.
virtual void	removeColumn (DataManagerColumn *)
	Delete a column.
void	setSeqnr (uInt nr)
	Set the sequence number of this data manager.
void	linkToTable (Table &tab)
	Link the data manager to the Table object.
virtual Bool	flush (AipsIO &ios, Bool fsync)=0
	Flush and optionally fsync the data.
virtual void	create (uInt nrrow)=0
	Let the data manager initialize itself for a new table.
virtual void	open (uInt nrrow, AipsIO &ios)=0
	Let the data manager initialize itself for an existing table.
virtual uInt	open1 (uInt nrrow, AipsIO &ios)
	Open as above.
virtual void	resync (uInt nrrow)=0
	Resync the data by rereading cached data from the file.
virtual uInt	resync1 (uInt nrrow)
	Resync as above.
virtual void	prepare ()
	Let the data manager initialize itself further.
Static Private Member Functions
static void	unlockedRegisterCtor (const String &type, DataManagerCtor func)
	Register a data manager constructor.
static void	doRegisterMainCtor (void *)
	Do the actual (thread-safe) registration of the main data managers.
Private Attributes
uInt	nrcol_p
uInt	seqnr_p
Bool	asBigEndian_p
TSMOption	tsmOption_p
Table *	table_p
DataManager *	clone_p
Static Private Attributes
static SimpleOrderedMap < String, DataManagerCtor >	theirRegisterMap
	Declare the mapping of the data manager type name to a static "makeObject" function.
static MutexedInit	theirMutexedInit
Friends
class	SetupNewTable
class	ColumnSet

Detailed Description

Abstract base class for a data manager.

Intended use:

Internal

Review Status

Reviewed By:: Gareth Hunt
Date Reviewed:: 94Nov17

Synopsis

DataManager is the abstract base class for all kind of table data managers. There are currently 2 classes of data managers:

Storage managers handling the storage of data. These classes have to be derived from DataManager. StManAipsIO is an example of a storage manager.
Virtual column engines handling the on-the-fly calculation of data, which are not stored as such. The base class for these is VirtualColumnEngine (which is derived from DataManager), from which all virtual columns engine must be derived from.

DataManager contains some common data and defines several virtual functions, which usually have to be implemented in the derived classes. It also contains some helper functions for the derived classes (like fileName().

The actual handling of a column by the data manager is defined in the abstract base class DataManagerColumn . Each data manager must have an associated class (derived from DataManagerColumn) to handle the columns.

There is a protocol defined how a data manager is created and initialized. For a new table it is:

The user creates data managers and binds them to columns. For example:
```
      SetupNewTable newtab("name.data", Table::New);  // set up new table
      StManAipsIO stman;                       // define storage manager
      newtab.bindColumn ("column1", stman);    // bind column to st.man.
      newtab.bindColumn ("column2", stman);    // bind column to st.man.
      Table tab(newtab);                       // actually create table
```
When the given data manager object is used for the first time in a bind function, a copy of the object is made using the clone function. Thus in the above example column1 and column2 share the same data manager; only at the first bind the stman object is cloned. Columns not explicitly bound to a data manager get implicitly bound to the default data manager (as defined in the column description) by the Table constructor (as used in line 5).
After binding the unbound columns, the PlainTable constructor sets up the data managers. For each column it asks the data manager to construct a DataManagerColumn object (in fact, an object of a class derived from DataManagerColumn). This is done by the functions createScalarColumn, createIndArrColumn and createDirArrColumn. For each data manager the create function is called. This allows them to initialize themselves and/or to call an initialization function in their column objects. This is, for instance, used by the storage managers to create files. Thereafter the prepare function is called to allow the data managers to do further initialization possibly requiring information from other columns.
When the table gets written (by the PlainTable destructor), the flush function is called for each data manager. This allows the data manager or their column objects to write or flush their data. The table system takes care of storing the information required to reconstruct the data managers. It uses the function dataManagerType to store the (unique) type name of the data manager class.
Finally each data manager object gets deleted. Their destructors must delete their column objects (if any and if needed).

For an existing table the procedure is slightly different:

The statement
Table tab("name.data"); will create a table object for an existing table. This has the effect that the given table file will be read to reconstruct the Table object and the data managers.
The stored data manager class names are used to reconstruct the data managers. This uses the static registration map, which maps the class name to a static class constructor function (usually called makeObject). This requires that the type name and constructor for each possible data manager are registered before the table is opened. The DataManager function registerMainCtor (implemented in DataManager.cc) is called before a table is opened, so registration of data managers should, in principle, be done there.
However, for unknown data managers it is tried to load a shared library whose name is the lowercase version of the data manager without a possible template argument (e.g. bitflagsengine for data manager BitFlagsEngine<Int>). It can be preceeded by lib or libcasa_ and followed by .so or .dylib. The shared library has to have a function with a name like register_bitflagsengine that must register the data manager(s). The function must be declared as extern "C", otherwise its name gets mangled.
Each table column is bound to the correct data manager. The sequence number stored in the table file is used for that purpose.
The DataManager createXXXColumn functions are called for each table column to let the data manager construct a data manager column object.
For each data manager the open function is called to allow it and its column objects to read back the information stored in the flush function. Thereafter the prepare function is called for each data manager to allow it to initialize some variables. The reason that open and prepare are separated is that in order to initialize variables it may be required to use other columns. So it may be needed that all columns are read back before they get initialized.
Similar to a new table the flush functions gets called when the table gets written. Destruction is also the same as sketched for new tables.

Motivation

An abstract base class is needed to support data managers and virtual column engines in the table system in a transparant way.

To Do

Handle unregistered data managers in a better way. Instead of throwing an exception a subprocess could be started which represents the data manager.

Definition at line 219 of file DataManager.h.

Constructor & Destructor Documentation

casa::DataManager::DataManager ( )

Default constructor.

virtual casa::DataManager::~DataManager ( ) [virtual]

casa::DataManager::DataManager ( const DataManager & ) [private]

The copy constructor cannot be used for this base class.

The clone function should be used instead. The private declaration of this constructor makes it unusable.

Member Function Documentation

virtual void casa::DataManager::addColumn ( DataManagerColumn * ) [private, virtual]

Add a column.

The default implementation throws a "not possible" exception.

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::SSMBase, casa::ISMBase, and casa::MSMBase.

virtual void casa::DataManager::addRow ( uInt nrrow ) [private, virtual]

Add rows to all columns.

The default implementation throws a "not possible" exception.

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::TiledDataStMan, casa::BaseMappedArrayEngine< VirtualType, StoredType >, casa::BaseMappedArrayEngine< Complex, Int >, casa::BaseMappedArrayEngine< Float, Short >, casa::BaseMappedArrayEngine< Bool, StoredType >, casa::SSMBase, casa::ISMBase, casa::TiledShapeStMan, casa::TiledCellStMan, casa::TiledColumnStMan, casa::MSMBase, and casa::VirtualColumnEngine.

Bool casa::DataManager::asBigEndian ( ) const [inline]

Have the data to be stored in big or little endian canonical format?

Definition at line 288 of file DataManager.h.

References asBigEndian_p.

virtual Bool casa::DataManager::canAddColumn ( ) const [virtual]

Does the data manager allow to add columns? (default no)

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::SSMBase, casa::ISMBase, and casa::MSMBase.

virtual Bool casa::DataManager::canAddRow ( ) const [virtual]

Does the data manager allow to add rows? (default no)

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::TiledStMan, casa::SSMBase, casa::ISMBase, casa::VirtualColumnEngine, and casa::MSMBase.

virtual Bool casa::DataManager::canReallocateColumns ( ) const [virtual]

Tell if the data manager wants to reallocate the data manager column objects.

This is used by the tiling storage manager. By default it returns False.

Reimplemented in casa::TiledStMan, and casa::MSMBase.

virtual Bool casa::DataManager::canRemoveColumn ( ) const [virtual]

Does the data manager allow to delete columns? (default no)

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::SSMBase, casa::ISMBase, and casa::MSMBase.

virtual Bool casa::DataManager::canRemoveRow ( ) const [virtual]

Does the data manager allow to delete rows? (default no)

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::SSMBase, casa::ISMBase, casa::VirtualColumnEngine, and casa::MSMBase.

void casa::DataManager::checkDataType	(	const DataManagerColumn *	colPtr,
		const String &	columnName,
		int	dataType,
		const String &	dataTypeId
	)		const `[private]`

Check if the data type of the created data manager column is correct.

virtual DataManager* casa::DataManager::clone ( ) const [pure virtual]

virtual void casa::DataManager::create ( uInt nrrow ) [private, pure virtual]

DataManagerColumn* casa::DataManager::createDirArrColumn	(	const String &	columnName,
		int	dataType,
		const String &	dataTypeId
	)

Create a direct array column.

DataManagerColumn* casa::DataManager::createIndArrColumn	(	const String &	columnName,
		int	dataType,
		const String &	dataTypeId
	)

Create an indirect array column.

DataManagerColumn* casa::DataManager::createScalarColumn	(	const String &	columnName,
		int	dataType,
		const String &	dataTypeId
	)

Create a column in the data manager on behalf of a table column.

It calls makeXColumn and checks the data type.

Create a scalar column. The dataTypeId argument is gives the id (i.e. name) of the data type of the column. It is only used for virtual columns of a non-standard data type to be able to check if the correctness of the column data type.
Storage managers only handle standard data types and can readily ignore this argument.

void casa::DataManager::dataManagerInfo ( Record & info ) const

Add SEQNR and SPEC (the DataManagerSpec subrecord) to the info.

virtual String casa::DataManager::dataManagerName ( ) const [virtual]

Return the name of the data manager.

This is the name of this instantiation of the data manager, thus not its type name. By default it returns an empty string.

Reimplemented in casa::RetypedArrayEngine< VirtualType, StoredType >, casa::ForwardColumnEngine, casa::StManAipsIO, casa::BitFlagsEngine< StoredType >, casa::ScaledArrayEngine< VirtualType, StoredType >, casa::SSMBase, casa::CompressComplex, casa::CompressFloat, casa::MappedArrayEngine< VirtualType, StoredType >, casa::TiledStMan, casa::ISMBase, and casa::MSMBase.

Referenced by casa::RODataManAccessor::dataManagerName().

virtual Record casa::DataManager::dataManagerSpec ( ) const [virtual]

Return a record containing data manager specifications.

The default implementation returns an empty record.

Reimplemented in casa::RetypedArrayEngine< VirtualType, StoredType >, casa::ForwardColumnEngine, casa::ForwardColumnIndexedRowEngine, casa::BitFlagsEngine< StoredType >, casa::TiledShapeStMan, casa::ScaledComplexData< VirtualType, StoredType >, casa::ScaledArrayEngine< VirtualType, StoredType >, casa::SSMBase, casa::CompressComplex, casa::CompressFloat, casa::MappedArrayEngine< VirtualType, StoredType >, casa::TiledStMan, casa::ISMBase, and casa::VirtualTaQLColumn.

virtual String casa::DataManager::dataManagerType ( ) const [pure virtual]

Return the type name of the data manager (in fact its class name).

It has to be a unique name, thus if the class is templated the template parameter has to be part of the name. This is used by the open/flush mechanism to be able to reconstruct the correct data manager.

Implemented in casa::RetypedArrayEngine< VirtualType, StoredType >, casa::CompressComplexSD, casa::ForwardColumnEngine, casa::StManAipsIO, casa::TiledDataStMan, casa::ForwardColumnIndexedRowEngine, casa::VSCEngine< T >, casa::BitFlagsEngine< StoredType >, casa::TiledShapeStMan, casa::ScaledComplexData< VirtualType, StoredType >, casa::ScaledArrayEngine< VirtualType, StoredType >, casa::TiledCellStMan, casa::TiledColumnStMan, casa::SSMBase, casa::CompressComplex, casa::CompressFloat, casa::MappedArrayEngine< VirtualType, StoredType >, casa::ISMBase, casa::VirtualTaQLColumn, casa::MSMBase, and casa::TiledFileHelper.

Referenced by casa::RODataManAccessor::dataManagerType().

void casa::DataManager::decrementNcolumn ( ) [inline, protected]

Decrement number of columns (in case a column is deleted).

Definition at line 371 of file DataManager.h.

References nrcol_p.

virtual void casa::DataManager::deleteManager ( ) [pure virtual]

The data manager will be deleted (because all its columns are requested to be deleted).

So clean up the things needed (e.g. delete files).

Implemented in casa::StManAipsIO, casa::SSMBase, casa::TiledStMan, casa::ISMBase, casa::VirtualColumnEngine, and casa::MSMBase.

static void casa::DataManager::doRegisterMainCtor ( void * ) [static, private]

Do the actual (thread-safe) registration of the main data managers.

String casa::DataManager::fileName ( ) const

Compose a unique filename from the table name and sequence number.

ByteIO::OpenOption casa::DataManager::fileOption ( ) const

Get the AipsIO option of the underlying file.

virtual Bool casa::DataManager::flush	(	AipsIO &	ios,
		Bool	fsync
	)		`[private, pure virtual]`

Flush and optionally fsync the data.

The AipsIO stream represents the main table file and can be used by virtual column engines to store SMALL amounts of data. It returns a True status if it had to flush (i.e. if data have changed).

Implemented in casa::StManAipsIO, casa::TiledDataStMan, casa::SSMBase, casa::TiledShapeStMan, casa::ISMBase, casa::TiledCellStMan, casa::TiledColumnStMan, casa::VirtualColumnEngine, casa::MSMBase, and casa::TiledFileHelper.

DataManager* casa::DataManager::getClone ( ) const [inline]

Has the object already been cloned?

Definition at line 502 of file DataManager.h.

References clone_p.

static DataManagerCtor casa::DataManager::getCtor ( const String & dataManagerType ) [static]

Get the "constructor" of a data manager (thread-safe).

virtual Record casa::DataManager::getProperties ( ) const [virtual]

Get data manager properties that can be modified.

It is a subset of the data manager specification. The default implementation returns an empty record.

Reimplemented in casa::BitFlagsEngine< StoredType >, casa::SSMBase, casa::TiledStMan, and casa::ISMBase.

static Bool casa::DataManager::isRegistered ( const String & dataManagerType ) [static]

Test if a data manager is registered (thread-safe).

virtual Bool casa::DataManager::isRegular ( ) const [virtual]

Is this a regular storage manager? It is regular if it allows addition of rows and writing dara in them.

The default implementation returns True.

virtual Bool casa::DataManager::isStorageManager ( ) const [virtual]

Is the data manager a storage manager? The default is yes.

Reimplemented in casa::VirtualColumnEngine.

String casa::DataManager::keywordName ( const String & keyword ) const

Compose a keyword name from the given keyword appended with the sequence number (e.g.

key_0). This makes the keyword name unique if multiple data managers are used with the same type.

void casa::DataManager::linkToTable ( Table & tab ) [private]

Link the data manager to the Table object.

virtual DataManagerColumn* casa::DataManager::makeDirArrColumn	(	const String &	columnName,
		int	dataType,
		const String &	dataTypeId
	)		`[private, pure virtual]`

Create a direct array column.

Implemented in casa::StManAipsIO, casa::SSMBase, casa::TiledStMan, casa::ISMBase, casa::VirtualColumnEngine, and casa::MSMBase.

virtual DataManagerColumn* casa::DataManager::makeIndArrColumn	(	const String &	columnName,
		int	dataType,
		const String &	dataTypeId
	)		`[private, pure virtual]`

Create an indirect array column.

Implemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::SSMBase, casa::ForwardColumnIndexedRowEngine, casa::TiledStMan, casa::BaseMappedArrayEngine< VirtualType, StoredType >, casa::BaseMappedArrayEngine< Complex, Int >, casa::BaseMappedArrayEngine< Float, Short >, casa::BaseMappedArrayEngine< Bool, StoredType >, casa::ISMBase, casa::VirtualColumnEngine, casa::MSMBase, and casa::VirtualTaQLColumn.

virtual DataManagerColumn* casa::DataManager::makeScalarColumn	(	const String &	columnName,
		int	dataType,
		const String &	dataTypeId
	)		`[private, pure virtual]`

Create a column in the data manager on behalf of a table column.

Create a scalar column.

Implemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::SSMBase, casa::ForwardColumnIndexedRowEngine, casa::VSCEngine< T >, casa::TiledStMan, casa::ISMBase, casa::VirtualColumnEngine, casa::MSMBase, and casa::VirtualTaQLColumn.

uInt casa::DataManager::ncolumn ( ) const [inline]

Get the nr of columns in this data manager (can be zero).

Definition at line 284 of file DataManager.h.

References nrcol_p.

virtual void casa::DataManager::open	(	uInt	nrrow,
		AipsIO &	ios
	)		`[private, pure virtual]`

Let the data manager initialize itself for an existing table.

The AipsIO stream represents the main table file and must be used by virtual column engines to retrieve the data stored in the flush function.

Implemented in casa::StManAipsIO, casa::SSMBase, casa::TiledStMan, casa::ISMBase, casa::VirtualColumnEngine, and casa::MSMBase.

virtual uInt casa::DataManager::open1	(	uInt	nrrow,
		AipsIO &	ios
	)		`[private, virtual]`

Open as above.

The data manager can return the number of rows it thinks there are. This is particularly useful for data managers like LofarStMan whose data are written outside the table system, thus for which no rows have been added.
By default it calls open and returns nrrow.

DataManager& casa::DataManager::operator= ( const DataManager & ) [private]

Assignment cannot be used for this base class.

The private declaration of this operator makes it unusable.

virtual void casa::DataManager::prepare ( ) [private, virtual]

Let the data manager initialize itself further.

Prepare is called after create/open has been called for all columns. In this way one can be sure that referenced columns are read back and partly initialized. The default implementation does nothing.

Reimplemented in casa::ForwardColumnEngine, casa::RetypedArrayEngine< VirtualType, StoredType >, casa::ForwardColumnIndexedRowEngine, casa::BaseMappedArrayEngine< VirtualType, StoredType >, casa::BaseMappedArrayEngine< Complex, Int >, casa::BaseMappedArrayEngine< Float, Short >, casa::BaseMappedArrayEngine< Bool, StoredType >, casa::BitFlagsEngine< StoredType >, casa::ScaledComplexData< VirtualType, StoredType >, casa::ScaledArrayEngine< VirtualType, StoredType >, casa::CompressComplex, casa::CompressFloat, casa::VirtualColumnEngine, casa::VirtualTaQLColumn, and casa::MSMBase.

virtual DataManagerColumn* casa::DataManager::reallocateColumn ( DataManagerColumn * column ) [virtual]

Reallocate the column object if it is part of this data manager.

It returns a pointer to the new column object. This function is used by the tiling storage manager. By default it does nothing and returns the input pointer.

Reimplemented in casa::TiledStMan, and casa::MSMBase.

static void casa::DataManager::registerCtor	(	const String &	type,
		DataManagerCtor	func
	)		`[static]`

Register a mapping of a data manager type to its static construction function.

It is fully thread-safe.

static void casa::DataManager::registerMainCtor ( ) [inline, static]

Register the main data managers (if not done yet).

It is fully thread-safe.

Definition at line 521 of file DataManager.h.

References casa::MutexedInit::exec(), and theirMutexedInit.

virtual void casa::DataManager::removeColumn ( DataManagerColumn * ) [private, virtual]

Delete a column.

The default implementation throws a "not possible" exception.

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::SSMBase, casa::ISMBase, and casa::MSMBase.

virtual void casa::DataManager::removeRow ( uInt rownr ) [private, virtual]

Delete a row from all columns.

The default implementation throws a "not possible" exception.

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::SSMBase, casa::ISMBase, casa::MSMBase, and casa::VirtualColumnEngine.

virtual void casa::DataManager::reopenRW ( ) [virtual]

Reopen the data manager for read/write access.

By default it is assumed that a reopen for read/write does not have to do anything.

Reimplemented in casa::ForwardColumnEngine, casa::StManAipsIO, casa::ForwardColumnIndexedRowEngine, casa::SSMBase, casa::TiledStMan, casa::ISMBase, casa::CompressComplex, and casa::CompressFloat.

virtual void casa::DataManager::resync ( uInt nrrow ) [private, pure virtual]

Resync the data by rereading cached data from the file.

This is called when a lock is acquired on the file and it appears that data in this data manager has been changed by another process.

Implemented in casa::StManAipsIO, casa::SSMBase, casa::TiledStMan, casa::ISMBase, casa::VirtualColumnEngine, and casa::MSMBase.

virtual uInt casa::DataManager::resync1 ( uInt nrrow ) [private, virtual]

Resync as above.

The data manager can return the number of rows it thinks there are. This is particularly useful for data managers like LofarStMan whose data are written outside the table system, thus for which no rows have been added.
By default it calls resync and returns nrrow.

uInt casa::DataManager::sequenceNr ( ) const [inline]

Get the (unique) sequence nr of this data manager.

Definition at line 280 of file DataManager.h.

References seqnr_p.

Referenced by casa::RODataManAccessor::dataManagerSeqNr().

void casa::DataManager::setClone ( DataManager * clone ) const [inline]

Set the pointer to the clone.

Definition at line 506 of file DataManager.h.

References clone(), and clone_p.

void casa::DataManager::setEndian ( Bool bigEndian ) [inline, protected]

Tell the data manager if big or little endian format is needed.

Definition at line 375 of file DataManager.h.