casa  5.7.0-16
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
Public Member Functions | Static Public Member Functions | Private Member Functions | Static Private Member Functions | Private Attributes | List of all members
casacore::PagedArray< T > Class Template Reference

A Lattice that is read from or written to disk. More...

#include <PagedArray.h>

Inheritance diagram for casacore::PagedArray< T >:
casacore::Lattice< T > casacore::LatticeBase

Public Member Functions

 PagedArray ()
 The default constructor creates a PagedArray that is useless for just about everything, except that it can be assigned to with the assignment operator. More...
 
 PagedArray (const TiledShape &shape, const String &filename)
 Construct a new PagedArray with the specified shape. More...
 
 PagedArray (const TiledShape &shape)
 Construct a new PagedArray with the specified shape. More...
 
 PagedArray (const TiledShape &shape, Table &file)
 Construct a new PagedArray, with the specified shape, in the default row and column of the supplied Table. More...
 
 PagedArray (const TiledShape &shape, Table &file, const String &columnName, uInt rowNum)
 Construct a new PagedArray, with the specified shape, in the specified row and column of the supplied Table. More...
 
 PagedArray (const String &filename)
 Reconstruct from a pre-existing PagedArray in the default row and column of the supplied Table with the supplied filename. More...
 
 PagedArray (Table &file)
 Reconstruct from a pre-existing PagedArray in the default row and column of the supplied Table. More...
 
 PagedArray (Table &file, const String &columnName, uInt rowNum)
 Reconstruct from a pre-existing PagedArray in the specified row and column of the supplied Table. More...
 
 PagedArray (const PagedArray< T > &other)
 The copy constructor which uses reference semantics. More...
 
 ~PagedArray ()
 The destructor flushes the PagedArrays contents to disk. More...
 
PagedArray< T > & operator= (const PagedArray< T > &other)
 The assignment operator with reference semantics. More...
 
virtual Lattice< T > * clone () const
 Make a copy of the object (reference semantics). More...
 
virtual Bool isPersistent () const
 A PagedArray is always persistent. More...
 
virtual Bool isPaged () const
 A PagedArray is always paged to disk. More...
 
virtual Bool isWritable () const
 Is the PagedArray writable? More...
 
virtual IPosition shape () const
 Returns the shape of the PagedArray. More...
 
virtual String name (Bool stripPath=False) const
 Return the current Table name. More...
 
void resize (const TiledShape &newShape)
 Functions to resize the PagedArray. More...
 
const StringtableName () const
 Returns the current table name (ie. More...
 
Tabletable ()
 Return the current table object. More...
 
const Tabletable () const
 
const StringcolumnName () const
 Returns the current Table column name of this PagedArray. More...
 
const ROTiledStManAccessoraccessor () const
 Returns an accessor to the tiled storage manager. More...
 
uInt rowNumber () const
 Returns the current row number of this PagedArray. More...
 
IPosition tileShape () const
 Returns the current tile shape for this PagedArray. More...
 
virtual uInt advisedMaxPixels () const
 Returns the maximum recommended number of pixels for a cursor. More...
 
virtual void setMaximumCacheSize (uInt howManyPixels)
 Set the maximum allowed cache size for all Arrays in this column of the Table. More...
 
virtual uInt maximumCacheSize () const
 Return the maximum allowed cache size (in pixels) for all Arrays in this column of the Table. More...
 
virtual void setCacheSizeInTiles (uInt howManyTiles)
 Set the actual cache size for this Array to be big enough for the indicated number of tiles. More...
 
virtual void setCacheSizeFromPath (const IPosition &sliceShape, const IPosition &windowStart, const IPosition &windowLength, const IPosition &axisPath)
 Set the actual cache size for this Array to "fit" the indicated path. More...
 
virtual void clearCache ()
 Clears and frees up the tile cache. More...
 
virtual void showCacheStatistics (ostream &os) const
 Generate a report on how the cache is doing. More...
 
virtual T getAt (const IPosition &where) const
 Return the value of the single element located at the argument IPosition. More...
 
virtual void putAt (const T &value, const IPosition &where)
 Put the value of a single element. More...
 
virtual Bool ok () const
 A function which checks for internal consistency. More...
 
virtual LatticeIterInterface< T > * makeIter (const LatticeNavigator &navigator, Bool useRef) const
 This function is used by the LatticeIterator class to generate an iterator of the correct type for a specified Lattice. More...
 
virtual Bool doGetSlice (Array< T > &buffer, const Slicer &section)
 Do the actual getting of an array of values. More...
 
virtual void doPutSlice (const Array< T > &sourceBuffer, const IPosition &where, const IPosition &stride)
 Do the actual getting of an array of values. More...
 
virtual IPosition doNiceCursorShape (uInt maxPixels) const
 Get the best cursor shape. More...
 
virtual Bool lock (FileLocker::LockType, uInt nattempts)
 Handle the (un)locking. More...
 
virtual void unlock ()
 
virtual Bool hasLock (FileLocker::LockType) const
 
virtual void resync ()
 Resynchronize the PagedArray object with the lattice file. More...
 
virtual void flush ()
 Flush the data (but do not unlock). More...
 
virtual void tempClose ()
 Temporarily close the lattice. More...
 
virtual void reopen ()
 Explicitly reopen the temporarily closed lattice. More...
 
- Public Member Functions inherited from casacore::Lattice< T >
virtual ~Lattice ()
 a virtual destructor is needed so that it will use the actual destructor in the derived class More...
 
virtual DataType dataType () const
 Get the data type of the lattice. More...
 
operator() (const IPosition &where) const
 Return the value of the single element located at the argument IPosition. More...
 
Bool get (COWPtr< Array< T > > &buffer, Bool removeDegenerateAxes=False) const
 Functions which extract an Array of values from a Lattice. More...
 
Bool getSlice (COWPtr< Array< T > > &buffer, const Slicer &section, Bool removeDegenerateAxes=False) const
 
Bool getSlice (COWPtr< Array< T > > &buffer, const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False) const
 
Bool getSlice (COWPtr< Array< T > > &buffer, const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False) const
 
Bool get (Array< T > &buffer, Bool removeDegenerateAxes=False)
 
Bool getSlice (Array< T > &buffer, const Slicer &section, Bool removeDegenerateAxes=False)
 
Bool getSlice (Array< T > &buffer, const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False)
 
Bool getSlice (Array< T > &buffer, const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False)
 
Array< T > get (Bool removeDegenerateAxes=False) const
 
Array< T > getSlice (const Slicer &section, Bool removeDegenerateAxes=False) const
 
Array< T > getSlice (const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False) const
 
Array< T > getSlice (const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False) const
 
void putSlice (const Array< T > &sourceBuffer, const IPosition &where, const IPosition &stride)
 A function which places an Array of values within this instance of the Lattice at the location specified by the IPosition "where", incrementing by "stride". More...
 
void putSlice (const Array< T > &sourceBuffer, const IPosition &where)
 
void put (const Array< T > &sourceBuffer)
 
virtual void set (const T &value)
 Set all elements in the Lattice to the given value. More...
 
virtual void apply (T(*function)(T))
 Replace every element, x, of the Lattice with the result of f(x). More...
 
virtual void apply (T(*function)(const T &))
 
virtual void apply (const Functional< T, T > &function)
 
void operator+= (const Lattice< T > &other)
 Add, subtract, multiple, or divide by another Lattice. More...
 
void operator-= (const Lattice< T > &other)
 
void operator*= (const Lattice< T > &other)
 
void operator/= (const Lattice< T > &other)
 
virtual void copyData (const Lattice< T > &from)
 Copy the data from the given lattice to this one. More...
 
virtual void copyDataTo (Lattice< T > &to) const
 Copy the data from this lattice to the given lattice. More...
 
- Public Member Functions inherited from casacore::LatticeBase
virtual ~LatticeBase ()
 A virtual destructor is needed so that it will use the actual destructor in the derived class. More...
 
virtual String imageType () const
 Get the image type (returns name of derived class). More...
 
virtual Bool canReferenceArray () const
 Can the lattice data be referenced as an array section? That is the case for an ArrayLattice or a Temp/SubLattice using it. More...
 
virtual void save (const String &fileName) const
 Save the image in an AipsIO file with the given name. More...
 
virtual uInt ndim () const
 Return the number of axes in this Lattice. More...
 
virtual size_t nelements () const
 Return the total number of elements in this Lattice. More...
 
size_t size () const
 
Bool conform (const LatticeBase &other) const
 Return a value of "True" if this instance of Lattice and 'other' have the same shape, otherwise returns a value of "False". More...
 
virtual LELCoordinates lelCoordinates () const
 Return the coordinates of the lattice. More...
 
IPosition niceCursorShape (uInt maxPixels) const
 Returns a recommended cursor shape for iterating through all the pixels in the Lattice. More...
 
IPosition niceCursorShape () const
 

Static Public Member Functions

static String defaultColumn ()
 Returns the default TableColumn name for a PagedArray. More...
 
static uInt defaultRow ()
 Returns the default row number for a PagedArray. More...
 

Private Member Functions

void setTableType ()
 Set the data in the TableInfo file. More...
 
void makeArray (const TiledShape &shape)
 make the ArrayColumn More...
 
void makeTable (const String &filename, Table::TableOption option)
 Make a Table to hold this PagedArray. More...
 
ArrayColumn< T > & getRWArray ()
 Get the writable ArrayColumn object. More...
 
void doReopen () const
 Do the reopen of the table (if not open already). More...
 
void tempReopen () const
 

Static Private Member Functions

static String defaultComment ()
 The default comment for PagedArray Colums. More...
 

Private Attributes

Table itsTable
 
String itsColumnName
 
uInt itsRowNumber
 
Bool itsIsClosed
 
Bool itsMarkDelete
 
String itsTableName
 
Bool itsWritable
 
TableLock itsLockOpt
 
ArrayColumn< T > itsArray
 
ROTiledStManAccessor itsAccessor
 

Additional Inherited Members

- Protected Member Functions inherited from casacore::Lattice< T >
 Lattice ()
 Define default constructor to satisfy compiler. More...
 
virtual void handleMath (const Lattice< T > &from, int oper)
 Handle the Math operators (+=, -=, *=, /=). More...
 
virtual void handleMathTo (Lattice< T > &to, int oper) const
 
 Lattice (const Lattice< T > &)
 Copy constructor and assignment can only be used by derived classes. More...
 
Lattice< T > & operator= (const Lattice< T > &)
 
template<>
void handleMathTo (Lattice< Bool > &, int) const
 
- Protected Member Functions inherited from casacore::LatticeBase
 LatticeBase ()
 Define default constructor to be used by derived classes. More...
 
 LatticeBase (const LatticeBase &)
 Copy constructor and assignment can only be used by derived classes. More...
 
LatticeBaseoperator= (const LatticeBase &)
 
void throwBoolMath () const
 Throw an exception for arithmetic on a Bool Lattice. More...
 

Detailed Description

template<class T>
class casacore::PagedArray< T >

A Lattice that is read from or written to disk.

Intended use:

Public interface

Review Status

Reviewed By:
Peter Barnes
Date Reviewed:
1999/10/30
Test programs:
tPagedArray
Demo programs:
dPagedArray

Prerequisite

Etymology

"Demand paging" is a technique used to implement virtual memory in computer operating systems. In this scheme, code or data are read from disk to memory only as needed by a process, and are read in fixed-sized chunks called "pages". PagedArrays are somewhat the same – though without the automatic features found in virtual memory demand paging. However PagedArrays do allow the user to access chunks of the disk in a flexible way, that can match the requirements of many algorithms.

Synopsis

At the time of writing, typical scientific computers provide sufficient memory for storing and manipulating 2-dimensional astronomical images, which have average size of around 8 MBytes. Astronomy is increasingly using three or higher dimensional arrays, which can be larger by one or two orders of magnitude. PagedArrays provide a convenient way of accessing these large arrays without requiring all the data to be read into real or virtual memory.

When you construct a PagedArray you do not read any data into memory. Instead a disk file (ie. a Table) is created, in a place you specify, to hold the data. This means you need to have enough disk space to hold the array. Constructing a PagedArray is equivalent to opening a file.

Because the data is stored on disk it can be saved after the program, function, or task that created the PagedArray has finished. This saved array can then be read again at a later stage.

So there are two reasons for using a PagedArray:

  1. To provide for arrays that are too large for the computer's memory.
  2. To provide a way of saving arrays to disk for later access.

To access the data in a PagedArray you can either:

  1. Use a LatticeIterator
  2. Use the getSlice and putSlice member functions
  3. Use the parenthesis operator or getAt and putAt functions

These access methods are given in order of preference. Some examples of these access methods are in the documentation for the Lattice class as well as below.

In nearly all cases you access the PagedArray by reading a "slice" of the PagedArray into a Casacore Array. Because the slice is stored in memory it is important that the slice you read is not too big compared to the physical memory on your computer. Otherwise your computer will page excessively and performance will be poor.

To overcome this you may be tempted to access the PagedArray a pixel at a time. This will use little memory but the overhead of accessing a large data set by separately reading each pixel from disk will also lead to poor performance.

In general the best way to access the data in PagedArrays is to use a LatticeIterator with a cursor size that "fits" nicely into memory. Not only do the LaticeIterator classes provide a relatively simple way to read/write all the data but they optimally set up the cache that is associated with each PagedArray.

If the LatticeIterator classes do not access the data the way you want you can use the getSlice and putSlice member functions. These functions do not set up the cache for you and improved performance may be obtained by tweaking the cache using the setCacheSizeFromPath member frunction.

More Details

In order to utilise PagedArrays fully and understand many of the member functions and data access methods in this class, you need to be familiar with some of the concepts involved in the implementation of PagedArrays.

Each PagedArray is stored in one cell of a Table as an indirect Array (see the documentation for the Tables module for more information). This means that multiple PagedArrays can be stored in one Table. To specify which PagedArray you are referring to in a given Table you need to specify the cell using its column name and row number during construction. If a cell is not specified the default column name (as given by the defaultColumnName function) and row number (as given by the defaultRowNumber function) are used. This ability to store multiple PagedArrays's is used in the PagedImage class where the image is stored in one cell and a mask is optionally stored in a another column in the same row.

There are currently a number of limitations when storing multiple PagedArrays in the same Table.

Each PagedArray is stored on disk using the tiled cell storage manager (TiledCellStMan). This stores the data in tiles which are regular subsections of the PagedArray. For example a PagedArray of shape [1024,1024,4,128] may have a tile shape of [32,16,4,16]. The data in each tile is stored as a unit on the disk. This means that there is no preferred axis when accessing multi-dimensional data.
The tile shape can be specified when constructing a new PagedArray but not when reading an old one as it is intrinsic to the way the data is stored on disk. It is NOT recommended that you specify the tile shape unless you can control the lifetime of the PagedArray (this includes the time it spends on disk), or can guarantee the access pattern. For example if you know that a PagedArray of shape [512,512,4,32] will always be sliced plane by plane you may prefer to specify a tile shape of [512,64,1,1] rather than the default of [32,16,4,16].
Tiles can be cached by the tile storage manager so that it does not need to read the data from disk every time you are accessing the a pixel in a different tile. In order to cache the correct tiles you should tell the storage manager what section of the PagedArray you will be accessing. This is done using the setCacheSizeFromPath member function. Alternatively you can set the size of the cache using the setCacheSizeInTiles member function.
By default there is no limit on how much memory the tile cache can consume. This can be changed using the setMaximumCacheSize member function. The tiled storage manager always tries to cache enough tiles to ensure that each tile is read from disk only once, so setting the maximum cache size will trade off memory usage for disk I/O. Setting the cache size is illustrated in example 5 below.
The showCacheStatistics member function is provided to allow you to evaluate the performance of the tile cache.

Example

All the examples in this section are available in dPagedArray.cc

Example 1:

Create a PagedArray of Floats of shape [1024,1024,4,256] in a file called "myData_tmp.array" and initialize it to zero. This will create a directory on disk called "myData_tmp.array" that contains files that exceed 1024*1024*4*256*4 (= 4 GBytes) in size.

const IPosition arrayShape(4,1024,1024,4,256);
const String filename("myData_tmp.array");
PagedArray<Float> diskArray(arrayShape, filename);
cout << "Created a PagedArray of shape " << diskArray.shape()
<< " (" << diskArray.shape().product()/1024/1024*sizeof(Float)
<< " MBytes)" << endl
<< "in the table called " << diskArray.tableName() << endl;
diskArray.set(0.0f);
// Using the set function is an efficient way to initialize the PagedArray
// as it uses a PagedArrIter internally. Note that the set function is
// defined in the Lattice class that PagedArray is derived from.

Example 2:

Read the PagedArray produced in Example 1 and put a Gaussian profile into each spectral channel.

PagedArray<Float> diskArray("myData_tmp.array");
IPosition shape = diskArray.shape();
// Construct a Gaussian Profile to be 10 channels wide and centred on
// channel 16. Its height is 1.0.
Gaussian1D<Float> g(1.0f, 16.0f, 10.0f);
// Create a vector to cache a sampled version of this profile.
Vector<Float> profile(shape(3));
indgen(profile);
profile.apply(g);
// Now put this profile into every spectral channel in the paged array. This
// is best done using an iterator.
LatticeIterator<Float> iter(diskArray,
TiledLineStepper(shape, diskArray.tileShape(), 3));
for (iter.reset(); !iter.atEnd(); iter++) {
iter.woCursor() = profile;
}

Example 3:

Now multiply the I-polarization data by 10.0 in this PagedArray. The I-polarization data occupies 1 GByte of RAM which is too big to read into the memory of most computers. So an iterator is used to get suitable sized chunks.

Table t("myData_tmp.array", Table::Update);
PagedArray<Float> da(t);
const IPosition latticeShape = da.shape();
const nx = latticeShape(0);
const ny = latticeShape(1);
const npol = latticeShape(2);
const nchan = latticeShape(3);
IPosition cursorShape = da.niceCursorShape();
cursorShape(2) = 1;
LatticeStepper step(latticeShape, cursorShape);
step.subSection(IPosition(4,0), IPosition(4,nx-1,ny-1,0,nchan-1));
LatticeIterator<Float> iter(da, step);
for (iter.reset(); !iter.atEnd(); iter++) {
iter.rwCursor() *= 10.0f;
}

Example 4:

Use a direct call to getSlice to access a small central region of the V-polarization in spectral channel 0 only. The region is small enough to not warrant constructing iterators and setting up LatticeNavigators. In this example the call to the getSlice function is unnecessary but is done for illustration purposes anyway.

SetupNewTable maskSetup("mask_tmp.array", TableDesc(), Table::New);
Table maskTable(maskSetup);
PagedArray<Bool> maskArray(IPosition(4,1024,1024,4,256), maskTable);
maskArray.set(False);
COWPtr<Array<Bool> > maskPtr;
maskArray.getSlice(maskPtr, IPosition(4,240,240,3,0),
IPosition(4,32,32,1,1), IPosition(4,1));
maskPtr.rwRef() = True;
maskArray.putSlice(*maskPtr, IPosition(4,240,240,3,1));

Example 5:

In this example the data in the PagedArray will be accessed a row at a time while setting the cache size to different values. The comments illustrate the results when running on an Ultra 1/140 with 64MBytes of memory.

PagedArray<Float> pa(IPosition(4,128,128,4,32));
const IPosition latticeShape = pa.shape();
cout << "The tile shape is:" << pa.tileShape() << endl;
// The tile shape is:[32, 16, 4, 16]
// Setup to access the PagedArray a row at a time
const IPosition sliceShape(4,latticeShape(0), 1, 1, 1);
const IPosition stride(4,1);
Array<Float> row(sliceShape);
IPosition start(4, 0);
// Set the cache size to enough pixels for one tile only. This uses
// 128kBytes of cache memory and takes 125 secs.
pa.setCacheSizeInTiles (1);
Timer clock;
for (start(3) = 0; start(3) < latticeShape(3); start(3)++) {
for (start(2) = 0; start(2) < latticeShape(2); start(2)++) {
for (start(1) = 0; start(1) < latticeShape(1); start(1)++) {
pa.getSlice(row, start, sliceShape, stride);
}
}
}
clock.show();
pa.showCacheStatistics(cout);
pa.clearCache();
// Set the cache size to enough pixels for one row of tiles (ie. 4).
// This uses 512 kBytes of cache memory and takes 10 secs.
pa.setCacheSizeInTiles (4);
clock.mark();
for (start(3) = 0; start(3) < latticeShape(3); start(3)++) {
for (start(2) = 0; start(2) < latticeShape(2); start(2)++) {
for (start(1) = 0; start(1) < latticeShape(1); start(1)++) {
pa.getSlice(row, start, sliceShape, stride);
}
}
}
clock.show();
pa.showCacheStatistics(cout);
pa.clearCache();
// Set the cache size to enough pixels for one plane of tiles
// (ie. 4*8). This uses 4 MBytes of cache memory and takes 2 secs.
pa.setCacheSizeInTiles (4*8);
clock.mark();
for (start(3) = 0; start(3) < latticeShape(3); start(3)++) {
for (start(2) = 0; start(2) < latticeShape(2); start(2)++) {
for (start(1) = 0; start(1) < latticeShape(1); start(1)++) {
pa.getSlice(row, start, sliceShape, stride);
}
}
}
clock.show();
pa.showCacheStatistics(cout);
pa.clearCache();

Motivation

Arrays of data are sometimes much too large to hold in random access memory. PagedArrays, especially in combination with LatticeIterator, provide convenient access to such large data sets.

Template Type Argument Requirements (T)

To Do

Definition at line 373 of file PagedArray.h.

Constructor & Destructor Documentation

template<class T>
casacore::PagedArray< T >::PagedArray ( )

The default constructor creates a PagedArray that is useless for just about everything, except that it can be assigned to with the assignment operator.

template<class T>
casacore::PagedArray< T >::PagedArray ( const TiledShape shape,
const String filename 
)

Construct a new PagedArray with the specified shape.

A new Table with the specified filename is constructed to hold the array. The Table will remain on disk after the PagedArray goes out of scope or is deleted.

template<class T>
casacore::PagedArray< T >::PagedArray ( const TiledShape shape)
explicit

Construct a new PagedArray with the specified shape.

A scratch Table is created in the current working directory to hold the array. This Table will be deleted automatically when the PagedArray goes out of scope or is deleted.

template<class T>
casacore::PagedArray< T >::PagedArray ( const TiledShape shape,
Table file 
)

Construct a new PagedArray, with the specified shape, in the default row and column of the supplied Table.

template<class T>
casacore::PagedArray< T >::PagedArray ( const TiledShape shape,
Table file,
const String columnName,
uInt  rowNum 
)

Construct a new PagedArray, with the specified shape, in the specified row and column of the supplied Table.

template<class T>
casacore::PagedArray< T >::PagedArray ( const String filename)
explicit

Reconstruct from a pre-existing PagedArray in the default row and column of the supplied Table with the supplied filename.

template<class T>
casacore::PagedArray< T >::PagedArray ( Table file)
explicit

Reconstruct from a pre-existing PagedArray in the default row and column of the supplied Table.

template<class T>
casacore::PagedArray< T >::PagedArray ( Table file,
const String columnName,
uInt  rowNum 
)

Reconstruct from a pre-existing PagedArray in the specified row and column of the supplied Table.

template<class T>
casacore::PagedArray< T >::PagedArray ( const PagedArray< T > &  other)

The copy constructor which uses reference semantics.

Copying by value doesn't make sense, because it would require the creation of a temporary (but possibly huge) file on disk.

template<class T>
casacore::PagedArray< T >::~PagedArray ( )

The destructor flushes the PagedArrays contents to disk.

Member Function Documentation

template<class T >
const ROTiledStManAccessor & casacore::PagedArray< T >::accessor ( ) const
inline

Returns an accessor to the tiled storage manager.

Definition at line 645 of file PagedArray.h.

template<class T>
virtual uInt casacore::PagedArray< T >::advisedMaxPixels ( ) const
virtual

Returns the maximum recommended number of pixels for a cursor.

This is the number of pixels in a tile.

Reimplemented from casacore::Lattice< T >.

template<class T>
virtual void casacore::PagedArray< T >::clearCache ( )
virtual

Clears and frees up the tile cache.

The maximum allowed cache size is unchanged from when setMaximumCacheSize was last called.

Reimplemented from casacore::LatticeBase.

template<class T>
virtual Lattice<T>* casacore::PagedArray< T >::clone ( ) const
virtual

Make a copy of the object (reference semantics).

Implements casacore::Lattice< T >.

template<class T >
const String & casacore::PagedArray< T >::columnName ( ) const
inline

Returns the current Table column name of this PagedArray.

Definition at line 633 of file PagedArray.h.

template<class T >
String casacore::PagedArray< T >::defaultColumn ( )
inlinestatic

Returns the default TableColumn name for a PagedArray.

Definition at line 639 of file PagedArray.h.

template<class T>
static String casacore::PagedArray< T >::defaultComment ( )
staticprivate

The default comment for PagedArray Colums.

template<class T >
uInt casacore::PagedArray< T >::defaultRow ( )
inlinestatic

Returns the default row number for a PagedArray.

Definition at line 657 of file PagedArray.h.

template<class T>
virtual Bool casacore::PagedArray< T >::doGetSlice ( Array< T > &  buffer,
const Slicer section 
)
virtual

Do the actual getting of an array of values.

Implements casacore::Lattice< T >.

template<class T>
virtual IPosition casacore::PagedArray< T >::doNiceCursorShape ( uInt  maxPixels) const
virtual

Get the best cursor shape.

Reimplemented from casacore::LatticeBase.

template<class T>
virtual void casacore::PagedArray< T >::doPutSlice ( const Array< T > &  sourceBuffer,
const IPosition where,
const IPosition stride 
)
virtual

Do the actual getting of an array of values.

Implements casacore::Lattice< T >.

template<class T >
void casacore::PagedArray< T >::doReopen ( ) const
private

Do the reopen of the table (if not open already).

Definition at line 663 of file PagedArray.h.

template<class T>
virtual void casacore::PagedArray< T >::flush ( )
virtual

Flush the data (but do not unlock).

Reimplemented from casacore::LatticeBase.

template<class T>
virtual T casacore::PagedArray< T >::getAt ( const IPosition where) const
virtual

Return the value of the single element located at the argument IPosition.

Note that Lattice::operator() can also be used.

Reimplemented from casacore::Lattice< T >.

template<class T >
ArrayColumn< T > & casacore::PagedArray< T >::getRWArray ( )
inlineprivate

Get the writable ArrayColumn object.

It reopens the table for write if needed.

Definition at line 607 of file PagedArray.h.

References casacore::True.

template<class T>
virtual Bool casacore::PagedArray< T >::hasLock ( FileLocker::LockType  ) const
virtual

Reimplemented from casacore::LatticeBase.

template<class T>
virtual Bool casacore::PagedArray< T >::isPaged ( ) const
virtual

A PagedArray is always paged to disk.

Reimplemented from casacore::LatticeBase.

template<class T>
virtual Bool casacore::PagedArray< T >::isPersistent ( ) const
virtual

A PagedArray is always persistent.

Reimplemented from casacore::LatticeBase.

template<class T>
virtual Bool casacore::PagedArray< T >::isWritable ( ) const
virtual

Is the PagedArray writable?

Reimplemented from casacore::LatticeBase.

template<class T>
virtual Bool casacore::PagedArray< T >::lock ( FileLocker::LockType  ,
uInt  nattempts 
)
virtual

Handle the (un)locking.

Reimplemented from casacore::LatticeBase.

template<class T>
void casacore::PagedArray< T >::makeArray ( const TiledShape shape)
private

make the ArrayColumn

template<class T>
virtual LatticeIterInterface<T>* casacore::PagedArray< T >::makeIter ( const LatticeNavigator navigator,
Bool  useRef 
) const
virtual

This function is used by the LatticeIterator class to generate an iterator of the correct type for a specified Lattice.

Not recommended for general use.

Reimplemented from casacore::Lattice< T >.

template<class T>
void casacore::PagedArray< T >::makeTable ( const String filename,
Table::TableOption  option 
)
private

Make a Table to hold this PagedArray.

template<class T>
virtual uInt casacore::PagedArray< T >::maximumCacheSize ( ) const
virtual

Return the maximum allowed cache size (in pixels) for all Arrays in this column of the Table.

The actual cache size may be smaller. A value of zero means that no maximum is currently defined.

Reimplemented from casacore::LatticeBase.

template<class T>
virtual String casacore::PagedArray< T >::name ( Bool  stripPath = False) const
virtual

Return the current Table name.

By default this includes the full path. The path preceeding the file name can be stripped off on request.

Reimplemented from casacore::LatticeBase.

template<class T>
virtual Bool casacore::PagedArray< T >::ok ( ) const
virtual

A function which checks for internal consistency.

Returns False if something nasty has happened to the PagedArray. In that case it also throws an exception.

Reimplemented from casacore::LatticeBase.

template<class T>
PagedArray<T>& casacore::PagedArray< T >::operator= ( const PagedArray< T > &  other)

The assignment operator with reference semantics.

As with the copy constructor assigning by value does not make sense.

template<class T>
virtual void casacore::PagedArray< T >::putAt ( const T &  value,
const IPosition where 
)
virtual

Put the value of a single element.

Reimplemented from casacore::Lattice< T >.

template<class T>
virtual void casacore::PagedArray< T >::reopen ( )
virtual

Explicitly reopen the temporarily closed lattice.

Reimplemented from casacore::LatticeBase.

template<class T>
void casacore::PagedArray< T >::resize ( const TiledShape newShape)

Functions to resize the PagedArray.

The old contents are lost. Usage of this function is NOT currently recommended (see the More Details section above).

template<class T>
virtual void casacore::PagedArray< T >::resync ( )
virtual

Resynchronize the PagedArray object with the lattice file.

This function is only useful if no read-locking is used, ie. if the table lock option is UserNoReadLocking or AutoNoReadLocking. In that cases the table system does not acquire a read-lock, thus does not synchronize itself automatically.

Reimplemented from casacore::LatticeBase.

template<class T >
uInt casacore::PagedArray< T >::rowNumber ( ) const
inline

Returns the current row number of this PagedArray.

Definition at line 651 of file PagedArray.h.

template<class T>
virtual void casacore::PagedArray< T >::setCacheSizeFromPath ( const IPosition sliceShape,
const IPosition windowStart,
const IPosition windowLength,
const IPosition axisPath 
)
virtual

Set the actual cache size for this Array to "fit" the indicated path.

This cache is not shared with PagedArrays in other rows and is always less than the maximum value. The sliceShape is the cursor or slice that you will be requiring (with each call to {get,put}Slice). The windowStart and windowLength delimit the range of pixels that will ultimatly be accessed. The AxisPath is described in the documentation for the LatticeStepper class.

Reimplemented from casacore::LatticeBase.

template<class T>
virtual void casacore::PagedArray< T >::setCacheSizeInTiles ( uInt  howManyTiles)
virtual

Set the actual cache size for this Array to be big enough for the indicated number of tiles.

This cache is not shared with PagedArrays in other rows and is always clipped to be less than the maximum value set using the setMaximumCacheSize member function. Tiles are cached using a first in first out algorithm.

Reimplemented from casacore::LatticeBase.

template<class T>
virtual void casacore::PagedArray< T >::setMaximumCacheSize ( uInt  howManyPixels)
virtual

Set the maximum allowed cache size for all Arrays in this column of the Table.

The actual value used may be smaller. A value of zero means that there is no maximum.

Reimplemented from casacore::LatticeBase.

template<class T>
void casacore::PagedArray< T >::setTableType ( )
private

Set the data in the TableInfo file.

template<class T>
virtual IPosition casacore::PagedArray< T >::shape ( ) const
virtual

Returns the shape of the PagedArray.

Implements casacore::LatticeBase.

template<class T>
virtual void casacore::PagedArray< T >::showCacheStatistics ( ostream &  os) const
virtual

Generate a report on how the cache is doing.

This is reset every time clearCache is called.

Reimplemented from casacore::LatticeBase.

template<class T >
Table & casacore::PagedArray< T >::table ( )
inline

Return the current table object.

Definition at line 620 of file PagedArray.h.

template<class T >
const Table & casacore::PagedArray< T >::table ( ) const
inline

Definition at line 626 of file PagedArray.h.

template<class T>
const String& casacore::PagedArray< T >::tableName ( ) const

Returns the current table name (ie.

filename) of this PagedArray.

template<class T>
virtual void casacore::PagedArray< T >::tempClose ( )
virtual

Temporarily close the lattice.

It will be reopened automatically on the next access.

Reimplemented from casacore::LatticeBase.

template<class T>
void casacore::PagedArray< T >::tempReopen ( ) const
private
template<class T>
IPosition casacore::PagedArray< T >::tileShape ( ) const

Returns the current tile shape for this PagedArray.

template<class T>
virtual void casacore::PagedArray< T >::unlock ( )
virtual

Reimplemented from casacore::LatticeBase.

Member Data Documentation

template<class T>
ROTiledStManAccessor casacore::PagedArray< T >::itsAccessor
mutableprivate

Definition at line 602 of file PagedArray.h.

template<class T>
ArrayColumn<T> casacore::PagedArray< T >::itsArray
mutableprivate

Definition at line 601 of file PagedArray.h.

template<class T>
String casacore::PagedArray< T >::itsColumnName
private

Definition at line 594 of file PagedArray.h.

template<class T>
Bool casacore::PagedArray< T >::itsIsClosed
mutableprivate

Definition at line 596 of file PagedArray.h.

template<class T>
TableLock casacore::PagedArray< T >::itsLockOpt
private

Definition at line 600 of file PagedArray.h.

template<class T>
Bool casacore::PagedArray< T >::itsMarkDelete
mutableprivate

Definition at line 597 of file PagedArray.h.

template<class T>
uInt casacore::PagedArray< T >::itsRowNumber
private

Definition at line 595 of file PagedArray.h.

template<class T>
Table casacore::PagedArray< T >::itsTable
mutableprivate

Definition at line 593 of file PagedArray.h.

template<class T>
String casacore::PagedArray< T >::itsTableName
private

Definition at line 598 of file PagedArray.h.

template<class T>
Bool casacore::PagedArray< T >::itsWritable
private

Definition at line 599 of file PagedArray.h.


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