KMemFile Class Reference

#include <kmemfile.h>

Inheritance diagram for KMemFile:

Public Member Functions
	KMemFile (const QString &filename, QObject *parent=0)
virtual	~KMemFile ()
virtual void	close ()
virtual bool	isSequential () const
virtual bool	open (OpenMode mode)
virtual bool	seek (qint64 pos)
virtual qint64	size () const

Static Public Member Functions
static void	fileContentsChanged (const QString &filename)

Protected Member Functions
virtual qint64	readData (char *data, qint64 maxSize)
virtual qint64	writeData (const char *data, qint64 maxSize)

Detailed Description

Simple QIODevice for QSharedMemory to keep ksycoca cache in memory only once The first call to open() loads the file into a shm segment. Every subsequent call only attaches to this segment. When the file content changed, you have to execute KMemFile::fileContentsChanged() to update the internal structures. The next call to open() creates a new shm segment. The old one is automatically destroyed when the last process closed KMemFile.

Definition at line 39 of file kmemfile.h.

Constructor & Destructor Documentation

KMemFile::KMemFile ( const QString &  filename, QObject *  parent = 0  )

explicit

ctor

Parameters

filename	the file to load into memory
parent	our parent

Definition at line 118 of file kmemfile.cpp.

KMemFile::~KMemFile ( )

virtual

dtor

Definition at line 124 of file kmemfile.cpp.

Member Function Documentation

void KMemFile::close ( )

virtual

closes the KMemFile

Reimplemented from superclass.

Definition at line 130 of file kmemfile.cpp.

void KMemFile::fileContentsChanged ( const QString &  filename )

static

This static function updates the internal information about the file loaded into shared memory.

The next time the file is opened, the file is reread from the file system.

Definition at line 238 of file kmemfile.cpp.

bool KMemFile::isSequential ( ) const

virtual

As KMemFile is a random access device, it returns false.

Reimplemented from superclass.

Definition at line 138 of file kmemfile.cpp.

bool KMemFile::open ( OpenMode  mode )

virtual

Reimplemented from superclass.

Parameters

mode	only QIODevice::ReadOnly is accepted

Definition at line 143 of file kmemfile.cpp.

qint64 KMemFile::readData ( char *  data, qint64  maxSize  )

protectedvirtual

Reimplemented from superclass.

Definition at line 220 of file kmemfile.cpp.

bool KMemFile::seek ( qint64  pos )

virtual

Sets the current read/write position to pos.

Reimplemented from superclass.

Parameters

pos	the new read/write position

Definition at line 204 of file kmemfile.cpp.

qint64 KMemFile::size ( ) const

virtual

Returns the size of the file.

Reimplemented from superclass.

Definition at line 215 of file kmemfile.cpp.

qint64 KMemFile::writeData ( const char *  data, qint64  maxSize  )

protectedvirtual

Reimplemented from superclass.

Definition at line 233 of file kmemfile.cpp.

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

• kmemfile.h
• kmemfile.cpp