TransactionalFileSystem Class Reference

Transactional librepcb::FileSystem implementation. More...

#include <transactionalfilesystem.h>

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Classes
struct	RestoreMode
	Convenience class providing standard implementations for librepcb::TransactionalFileSystem::RestoreCallback. More...

Public Types
typedef std::function< bool(const FilePath &dir)>	RestoreCallback
	Callback type used to determine whether a backup should be restored or not. More...

Public Member Functions
	TransactionalFileSystem ()=delete
	TransactionalFileSystem (const FilePath &filepath, bool writable=false, RestoreCallback restoreCallback=RestoreCallback(), QObject *parent=nullptr)
	TransactionalFileSystem (const TransactionalFileSystem &other)=delete
virtual	~TransactionalFileSystem () noexcept
const FilePath &	getPath () const noexcept
bool	isWritable () const noexcept
bool	isRestoredFromAutosave () const noexcept
virtual FilePath	getAbsPath (const QString &path="") const noexcept override
virtual QStringList	getDirs (const QString &path="") const noexcept override
virtual QStringList	getFiles (const QString &path="") const noexcept override
virtual bool	fileExists (const QString &path) const noexcept override
virtual QByteArray	read (const QString &path) const override
virtual void	write (const QString &path, const QByteArray &content) override
virtual void	removeFile (const QString &path) override
virtual void	removeDirRecursively (const QString &path="") override
void	loadFromZip (QByteArray content)
void	loadFromZip (const FilePath &fp)
QByteArray	exportToZip () const
void	exportToZip (const FilePath &fp) const
void	discardChanges () noexcept
QStringList	checkForModifications () const
void	autosave ()
void	save ()
Public Member Functions inherited from FileSystem
	FileSystem (QObject *parent=nullptr) noexcept
virtual	~FileSystem () noexcept

Static Public Member Functions
static std::shared_ptr< TransactionalFileSystem >	open (const FilePath &filepath, bool writable, RestoreCallback restoreCallback=&RestoreMode::no, QObject *parent=nullptr)
static std::shared_ptr< TransactionalFileSystem >	openRO (const FilePath &filepath, RestoreCallback restoreCallback=&RestoreMode::no, QObject *parent=nullptr)
static std::shared_ptr< TransactionalFileSystem >	openRW (const FilePath &filepath, RestoreCallback restoreCallback=&RestoreMode::no, QObject *parent=nullptr)
static QString	cleanPath (QString path) noexcept

Private Member Functions
bool	isRemoved (const QString &path) const noexcept
void	exportDirToZip (QuaZipFile &file, const FilePath &zipFp, const QString &dir) const
void	saveDiff (const QString &type) const
void	loadDiff (const FilePath &fp)
void	removeDiff (const QString &type)

Private Attributes
FilePath	mFilePath
bool	mIsWritable
DirectoryLock	mLock
bool	mRestoredFromAutosave
QHash< QString, QByteArray >	mModifiedFiles
QSet< QString >	mRemovedFiles
QSet< QString >	mRemovedDirs

Detailed Description

Transactional librepcb::FileSystem implementation.

This is an implementation of the librepcb::FileSystem interface with many features needed to create, open and save LibrePCB library elements and projects in a very safe way to always guarantee consistency of all files.

It handles following things:

• Supports read-only access to the file system to guarantee absolutely nothing is written to the disk.
• In R/W mode, it locks the accessed directory to avoid parallel usage (see Avoid opening a project multiple times (Directory Lock))
• Supports periodic saving to allow restoring the last autosave backup after an application crash (see Automatic Periodic Saving (autosave)).
• Holds all file modifications in memory and allows to write those in an atomic way to the disk (see Atomic Saving Procedure).
• Allows to export the whole file system to a ZIP file.

Member Typedef Documentation

RestoreCallback

typedef std::function<bool(const FilePath& dir)> RestoreCallback

Callback type used to determine whether a backup should be restored or not.

Parameters

dir	The directory to be restored.

Return values

true	Restore backup.
false	Do not restore backup.

Exceptions

librepcb::Exception

to abort opening the directory.

Constructor & Destructor Documentation

TransactionalFileSystem() [1/3]

TransactionalFileSystem ( )

delete

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TransactionalFileSystem() [2/3]

TransactionalFileSystem	(	const FilePath &	filepath,
		bool	writable = false,
		RestoreCallback	restoreCallback = RestoreCallback(),
		QObject *	parent = nullptr
	)

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TransactionalFileSystem() [3/3]

TransactionalFileSystem ( const TransactionalFileSystem &  other )

delete

~TransactionalFileSystem()

~TransactionalFileSystem ( )

virtualnoexcept

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Member Function Documentation

getPath()

const FilePath& getPath ( ) const

inlinenoexcept

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isWritable()

bool isWritable ( ) const

inlinenoexcept

isRestoredFromAutosave()

bool isRestoredFromAutosave ( ) const

inlinenoexcept

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getAbsPath()

FilePath getAbsPath ( const QString &  path = "" ) const

overridevirtualnoexcept

Implements FileSystem.

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getDirs()

QStringList getDirs ( const QString &  path = "" ) const

overridevirtualnoexcept

Implements FileSystem.

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getFiles()

QStringList getFiles ( const QString &  path = "" ) const

overridevirtualnoexcept

Implements FileSystem.

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fileExists()

bool fileExists ( const QString &  path ) const

overridevirtualnoexcept

Implements FileSystem.

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read()

QByteArray read ( const QString &  path ) const

overridevirtual

Implements FileSystem.

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write()

void write ( const QString &  path, const QByteArray &  content  )

overridevirtual

Implements FileSystem.

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removeFile()

void removeFile ( const QString &  path )

overridevirtual

Implements FileSystem.

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removeDirRecursively()

void removeDirRecursively ( const QString &  path = "" )

overridevirtual

Implements FileSystem.

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loadFromZip() [1/2]

void loadFromZip

(

QByteArray

content

)

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loadFromZip() [2/2]

void loadFromZip

(

const FilePath &

fp

)

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exportToZip() [1/2]

QByteArray exportToZip

(

)

const

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exportToZip() [2/2]

void exportToZip

(

const FilePath &

fp

)

const

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discardChanges()

void discardChanges ( )

noexcept

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checkForModifications()

QStringList checkForModifications

(

)

const

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autosave()

void autosave

(

)

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save()

void save

(

)

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open()

static std::shared_ptr<TransactionalFileSystem> open ( const FilePath &  filepath, bool  writable, RestoreCallback  restoreCallback = &RestoreMode::no, QObject *  parent = nullptr  )

inlinestatic

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openRO()

static std::shared_ptr<TransactionalFileSystem> openRO ( const FilePath &  filepath, RestoreCallback  restoreCallback = &RestoreMode::no, QObject *  parent = nullptr  )

inlinestatic

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openRW()

static std::shared_ptr<TransactionalFileSystem> openRW ( const FilePath &  filepath, RestoreCallback  restoreCallback = &RestoreMode::no, QObject *  parent = nullptr  )

inlinestatic

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cleanPath()

QString cleanPath ( QString  path )

staticnoexcept

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isRemoved()

bool isRemoved ( const QString &  path ) const

privatenoexcept

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exportDirToZip()

void exportDirToZip ( QuaZipFile &  file, const FilePath &  zipFp, const QString &  dir  ) const

private

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saveDiff()

void saveDiff ( const QString &  type ) const

private

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loadDiff()

void loadDiff ( const FilePath &  fp )

private

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removeDiff()

void removeDiff ( const QString &  type )

private

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Member Data Documentation

mFilePath

FilePath mFilePath

private

mIsWritable

bool mIsWritable

private

mLock

DirectoryLock mLock

private

mRestoredFromAutosave

bool mRestoredFromAutosave

private

mModifiedFiles

QHash<QString, QByteArray> mModifiedFiles

private

mRemovedFiles

QSet<QString> mRemovedFiles

private

mRemovedDirs

QSet<QString> mRemovedDirs

private

---

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

• /__w/1/s/libs/librepcb/common/fileio/transactionalfilesystem.h
• /__w/1/s/libs/librepcb/common/fileio/transactionalfilesystem.cpp