A TMemFile is like a normal TFile except that it reads and writes only from memory.

Definition at line 19 of file TMemFile.h.

Classes
struct	TMemBlock

Public Types
using	ExternalDataPtr_t = std::shared_ptr< const std::vector< char > >

Public Types inherited from TFile
enum	{ kStartBigFile = 2000000000 }

enum	EAsyncOpenStatus { kAOSNotAsync = -1, kAOSFailure = 0, kAOSInProgress = 1, kAOSSuccess = 2 }
	Asynchronous open request status. More...

enum	ECacheAction { kDisconnect = 0, kDoNotDisconnect = 1 }
	TTreeCache flushing semantics. More...

enum	EFileType { kDefault = 0, kLocal = 1, kNet = 2, kWeb = 3, kFile = 4, kMerge = 5 }
	File type. More...

enum	EOpenTimeOut { kInstantTimeout = 0, kEternalTimeout = 999999999 }
	Open timeout constants. More...

enum	ERelativeTo { kBeg = 0, kCur = 1, kEnd = 2 }

enum	EStatusBits { kRecovered = BIT(10), kHasReferences = BIT(11), kDevNull = BIT(12), kWriteError = BIT(14), kBinaryFile = BIT(15), kRedirected = BIT(16) }
	TFile status bits. BIT(13) is taken up by TObject. More...

Public Types inherited from TDirectoryFile
enum	{ kCloseDirectory = BIT(7) }

Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kInconsistent = 0x08000000, kBitMask = 0x00ffffff }

enum	{ kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }

enum	EDeprecatedStatusBits { kObjInCanvas = BIT(3) }

enum	EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }

Public Member Functions
	TMemFile (const char name, Option_t option="", const char *ftitle="", Int_t compress=1)
	Usual Constructor. See the TFile constructor for details. More...

	TMemFile (const char name, char buffer, Long64_t size, Option_t option="", const char ftitle="", Int_t compress=1)
	Usual Constructor. See the TFile constructor for details. Copy data from buffer. More...

	TMemFile (const char *name, ExternalDataPtr_t data)
	Constructor to create a TMemFile re-using external storage. More...

	TMemFile (const TMemFile &orig)
	Copying the content of the TMemFile into another TMemFile. More...

virtual	~TMemFile ()
	Close and clean-up file. More...

virtual Long64_t	CopyTo (void *to, Long64_t maxsize) const
	Copy the binary representation of the TMemFile into the memory area starting at 'to' and of length at most 'maxsize' returns the number of bytes actually copied. More...

virtual void	CopyTo (TBuffer &tobuf) const
	Copy the binary representation of the TMemFile into the TBuffer tobuf. More...

virtual Long64_t	GetSize () const
	Return the current size of the memory file. More...

virtual void	Print (Option_t *option="") const
	Print all objects in the file. More...

void	ResetAfterMerge (TFileMergeInfo *)
	Wipe all the data from the permanent buffer but keep, the in-memory object alive. More...

void	ResetErrno () const
	Simply calls TSystem::ResetErrno(). More...

Public Member Functions inherited from TFile
	TFile ()
	File default Constructor. More...

	TFile (const char fname, Option_t option="", const char *ftitle="", Int_t compress=1)
	Opens or creates a local ROOT file. More...

virtual	~TFile ()
	File destructor. More...

virtual void	Close (Option_t *option="")
	Close a file. More...

virtual void	Copy (TObject &) const
	Copy this to obj. More...

virtual Bool_t	Cp (const char *dst, Bool_t progressbar=kTRUE, UInt_t buffersize=1000000)
	Allows to copy this file to the dst URL. More...

virtual TKey *	CreateKey (TDirectory mother, const TObject obj, const char *name, Int_t bufsize)
	Creates key for object and converts data to buffer. More...

virtual TKey *	CreateKey (TDirectory mother, const void obj, const TClass cl, const char name, Int_t bufsize)
	Creates key for object and converts data to buffer. More...

virtual void	Delete (const char *namecycle="")
	Delete object namecycle. More...

virtual void	Draw (Option_t *option="")
	Fill Graphics Structure and Paint. More...

virtual void	DrawMap (const char keys="", Option_t *option="")
	Draw map of objects in this file. More...

virtual void	FillBuffer (char *&buffer)
	Encode file output buffer. More...

virtual void	Flush ()
	Synchronize a file's in-memory and on-disk states. More...

TArchiveFile *	GetArchive () const

Long64_t	GetArchiveOffset () const

Int_t	GetBestBuffer () const
	Return the best buffer size of objects on this file. More...

virtual Long64_t	GetBytesRead () const

virtual Long64_t	GetBytesReadExtra () const

virtual Int_t	GetBytesToPrefetch () const
	Max number of bytes to prefetch. More...

virtual Long64_t	GetBytesWritten () const
	Return the total number of bytes written so far to the file. More...

TFileCacheRead *	GetCacheRead (const TObject *tree=0) const
	Return a pointer to the current read cache. More...

TFileCacheWrite *	GetCacheWrite () const
	Return a pointer to the current write cache. More...

TArrayC *	GetClassIndex () const

Int_t	GetCompressionAlgorithm () const

Float_t	GetCompressionFactor ()
	Return the file compression factor. More...

Int_t	GetCompressionLevel () const

Int_t	GetCompressionSettings () const

virtual Long64_t	GetEND () const

virtual const TUrl *	GetEndpointUrl () const

virtual Int_t	GetErrno () const
	Method returning errno. Is overriden in TRFIOFile. More...

Int_t	GetFd () const

TList *	GetListOfFree () const

TObjArray *	GetListOfProcessIDs () const

virtual Int_t	GetNbytesFree () const

virtual Int_t	GetNbytesInfo () const

virtual TString	GetNewUrl ()

virtual Int_t	GetNfree () const

virtual Int_t	GetNProcessIDs () const

Option_t *	GetOption () const

virtual Int_t	GetReadCalls () const

Int_t	GetRecordHeader (char *buf, Long64_t first, Int_t maxbytes, Int_t &nbytes, Int_t &objlen, Int_t &keylen)
	Read the logical record header starting at a certain postion. More...

Long64_t	GetRelOffset () const

virtual Long64_t	GetSeekFree () const

virtual Long64_t	GetSeekInfo () const

const TList *	GetStreamerInfoCache ()
	Returns the cached list of StreamerInfos used in this file. More...

virtual TList *	GetStreamerInfoList () final
	Read the list of TStreamerInfo objects written to this file. More...

Int_t	GetVersion () const

virtual void	IncrementProcessIDs ()

virtual Bool_t	IsArchive () const

Bool_t	IsBinary () const

virtual Bool_t	IsOpen () const
	Returns kTRUE in case file is open and kFALSE if file is not open. More...

Bool_t	IsRaw () const

virtual void	ls (Option_t *option="") const
	List file contents. More...

virtual void	MakeFree (Long64_t first, Long64_t last)
	Mark unused bytes on the file. More...

virtual void	MakeProject (const char dirname, const char classes="", Option_t option="new")
	Generate source code necessary to access the objects stored in the file. More...

virtual void	Map (Option_t *opt)
	List the contents of a file sequentially. More...

virtual void	Map ()

virtual Bool_t	Matches (const char *name)
	Return kTRUE if 'url' matches the coordinates of this file. More...

virtual Bool_t	MustFlush () const

virtual void	Paint (Option_t *option="")
	Paint all objects in the file. More...

virtual Bool_t	ReadBuffer (char *buf, Int_t len)
	Read a buffer from the file. More...

virtual Bool_t	ReadBuffer (char *buf, Long64_t pos, Int_t len)
	Read a buffer from the file at the offset 'pos' in the file. More...

virtual Bool_t	ReadBufferAsync (Long64_t offs, Int_t len)

virtual Bool_t	ReadBuffers (char buf, Long64_t pos, Int_t *len, Int_t nbuf)
	Read the nbuf blocks described in arrays pos and len. More...

virtual void	ReadFree ()
	Read the FREE linked list. More...

virtual TProcessID *	ReadProcessID (UShort_t pidf)
	The TProcessID with number pidf is read from this file. More...

virtual void	ReadStreamerInfo ()
	Read the list of StreamerInfo from this file. More...

virtual Int_t	Recover ()
	Attempt to recover file if not correctly closed. More...

virtual Int_t	ReOpen (Option_t *mode)
	Reopen a file with a different access mode. More...

virtual void	Seek (Long64_t offset, ERelativeTo pos=kBeg)
	Seek to a specific position in the file. Pos it either kBeg, kCur or kEnd. More...

virtual void	SetCacheRead (TFileCacheRead cache, TObject tree=0, ECacheAction action=kDisconnect)
	Set a pointer to the read cache. More...

virtual void	SetCacheWrite (TFileCacheWrite *cache)
	Set a pointer to the write cache. More...

virtual void	SetCompressionAlgorithm (Int_t algorithm=0)
	See comments for function SetCompressionSettings. More...

virtual void	SetCompressionLevel (Int_t level=1)
	See comments for function SetCompressionSettings. More...

virtual void	SetCompressionSettings (Int_t settings=1)
	Used to specify the compression level and algorithm. More...

virtual void	SetEND (Long64_t last)

virtual void	SetOffset (Long64_t offset, ERelativeTo pos=kBeg)
	Set position from where to start reading. More...

virtual void	SetOption (Option_t *option=">")

virtual void	SetReadCalls (Int_t readcalls=0)

virtual void	ShowStreamerInfo ()
	Show the StreamerInfo of all classes written to this file. More...

virtual Int_t	Sizeof () const
	Return the size in bytes of the file header. More...

void	SumBuffer (Int_t bufsize)
	Increment statistics for buffer sizes of objects in this file. More...

virtual Int_t	Write (const char *name=0, Int_t opt=0, Int_t bufsiz=0)
	Write memory objects to this file. More...

virtual Int_t	Write (const char *name=0, Int_t opt=0, Int_t bufsiz=0) const
	One can not save a const TDirectory object. More...

virtual Bool_t	WriteBuffer (const char *buf, Int_t len)
	Write a buffer to the file. More...

virtual void	WriteFree ()
	Write FREE linked list on the file. More...

virtual void	WriteHeader ()
	Write File Header. More...

virtual UShort_t	WriteProcessID (TProcessID *pid)
	Check if the ProcessID pidd is already in the file, if not, add it and return the index number in the local file list. More...

virtual void	WriteStreamerInfo ()
	Write the list of TStreamerInfo as a single object in this file The class Streamer description for all classes written to this file is saved. More...

Public Member Functions inherited from TDirectoryFile
	TDirectoryFile ()
	Default Constructor. More...

	TDirectoryFile (const char name, const char title, Option_t option="", TDirectory motherDir=0)
	Create a new TDirectoryFile. More...

virtual	~TDirectoryFile ()
	Destructor. More...

void	Add (TObject *obj, Bool_t replace=kFALSE)

virtual void	Append (TObject *obj, Bool_t replace=kFALSE)
	Append object to this directory. More...

Int_t	AppendKey (TKey *key)
	Insert key in the linked list of keys of this directory. More...

virtual void	Browse (TBrowser *b)
	Browse the content of the directory. More...

void	Build (TFile motherFile=0, TDirectory motherDir=0)
	Initialise directory to defaults. More...

virtual Bool_t	cd (const char *path=0)
	Change current directory to "this" directory. More...

virtual TObject *	CloneObject (const TObject *obj, Bool_t autoadd=kTRUE)
	Make a clone of an object using the Streamer facility. More...

virtual TKey *	FindKey (const char *keyname) const
	Find key with name keyname in the current directory. More...

virtual TKey *	FindKeyAny (const char *keyname) const
	Find key with name keyname in the current directory or its subdirectories. More...

virtual TObject *	FindObjectAny (const char *name) const
	Find object by name in the list of memory objects of the current directory or its sub-directories. More...

virtual TObject *	FindObjectAnyFile (const char *name) const
	Scan the memory lists of all files for an object with name. More...

virtual TObject *	Get (const char *namecycle)
	Return pointer to object identified by namecycle. More...

virtual Int_t	GetBufferSize () const
	Return the buffer size to create new TKeys. More...

const TDatime &	GetCreationDate () const

virtual TDirectory *	GetDirectory (const char apath, Bool_t printError=false, const char funcname="GetDirectory")
	Find a directory named "apath". More...

virtual TFile *	GetFile () const

virtual TKey *	GetKey (const char *name, Short_t cycle=9999) const
	Return pointer to key with name,cycle. More...

virtual TList *	GetListOfKeys () const

const TDatime &	GetModificationDate () const

virtual Int_t	GetNbytesKeys () const

virtual Int_t	GetNkeys () const

template<class T >
void	GetObject (const char namecycle, T &ptr)

virtual void *	GetObjectChecked (const char namecycle, const char classname)
	See documentation of TDirectoryFile::GetObjectCheck(const char namecycle, const TClass cl) More...

virtual void *	GetObjectChecked (const char namecycle, const TClass cl)
	Return pointer to object identified by namecycle if and only if the actual object is a type suitable to be stored as a pointer to a "expectedClass" If expectedClass is null, no check is performed. More...

virtual void *	GetObjectUnchecked (const char *namecycle)
	Return pointer to object identified by namecycle. More...

virtual Long64_t	GetSeekDir () const

virtual Long64_t	GetSeekKeys () const

virtual Long64_t	GetSeekParent () const

Bool_t	IsModified () const

Bool_t	IsWritable () const

virtual TDirectory *	mkdir (const char name, const char title="")
	Create a sub-directory "a" or a hierarchy of sub-directories "a/b/c/...". More...

virtual TFile *	OpenFile (const char name, Option_t option="", const char *ftitle="", Int_t compress=1, Int_t netopt=0)
	Interface to TFile::Open. More...

virtual void	Purge (Short_t nkeep=1)
	Purge lowest key cycles in a directory. More...

virtual void	ReadAll (Option_t *option="")
	Read objects from a ROOT file directory into memory. More...

virtual Int_t	ReadKeys (Bool_t forceRead=kTRUE)
	Read the linked list of keys. More...

virtual Int_t	ReadTObject (TObject obj, const char keyname)
	Read object with keyname from the current directory. More...

virtual void	rmdir (const char *name)
	Removes subdirectory from the directory. More...

virtual void	Save ()
	Save recursively all directory keys and headers. More...

virtual Int_t	SaveObjectAs (const TObject obj, const char filename="", Option_t *option="") const
	Save object in filename. More...

virtual void	SaveSelf (Bool_t force=kFALSE)
	Save Directory keys and header. More...

virtual void	SetBufferSize (Int_t bufsize)
	Set the default buffer size when creating new TKeys. More...

void	SetModified ()

void	SetSeekDir (Long64_t v)

virtual void	SetTRefAction (TObject ref, TObject parent)
	Find the action to be executed in the dictionary of the parent class and store the corresponding exec number into fBits. More...

void	SetWritable (Bool_t writable=kTRUE)
	Set the new value of fWritable recursively. More...

virtual void	WriteDirHeader ()
	Overwrite the Directory header record. More...

virtual void	WriteKeys ()
	Write Keys linked list on the file. More...

virtual Int_t	WriteObjectAny (const void obj, const char classname, const char name, Option_t option="", Int_t bufsize=0)
	Write object from pointer of class classname in this directory. More...

virtual Int_t	WriteObjectAny (const void obj, const TClass cl, const char name, Option_t option="", Int_t bufsize=0)
	Write object of class with dictionary cl in this directory. More...

virtual Int_t	WriteTObject (const TObject obj, const char name=0, Option_t *option="", Int_t bufsize=0)
	Write object obj to this directory. More...

Public Member Functions inherited from TDirectory
	TDirectory ()
	Directory default constructor. More...

	TDirectory (const char name, const char title, Option_t option="", TDirectory motherDir=0)
	Create a new Directory. More...

virtual	~TDirectory ()
	Destructor. More...

virtual void	Clear (Option_t *option="")
	Delete all objects from a Directory list. More...

virtual void	DeleteAll (Option_t *option="")
	Delete all objects from memory. More...

virtual TObject *	FindObject (const char *name) const
	Find object by name in the list of memory objects. More...

virtual TObject *	FindObject (const TObject *obj) const
	Find object in the list of memory objects. More...

virtual TList *	GetList () const

virtual TObject *	GetMother () const

virtual TDirectory *	GetMotherDir () const

template<class T >
void	GetObject (const char namecycle, T &ptr)

virtual const char *	GetPath () const
	Returns the full path of the directory. More...

virtual const char *	GetPathStatic () const
	Returns the full path of the directory. More...

TUUID	GetUUID () const

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...

virtual void	pwd () const
	Print the path of the directory. More...

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove object from a Directory. More...

virtual TObject *	Remove (TObject *)
	Remove an object from the in-memory list. More...

virtual void	SetMother (TObject *mother)

virtual void	SetName (const char *newname)
	Set the name for directory If the directory name is changed after the directory was written once, ROOT currently would NOT change the name of correspondent key in the mother directory. More...

template<class T >
Int_t	WriteObject (const T obj, const char name, Option_t *option="", Int_t bufsize=0)

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TString &name, const TString &title)

	TNamed (const TNamed &named)
	TNamed copy ctor. More...

virtual	~TNamed ()
	TNamed destructor. More...

virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility. More...

virtual Int_t	Compare (const TObject *obj) const
	Compare two TNamed objects. More...

virtual const char *	GetName () const
	Returns name of object. More...

virtual const char *	GetTitle () const
	Returns title of object. More...

virtual ULong_t	Hash () const
	Return hash value for this object. More...

virtual Bool_t	IsSortable () const

TNamed &	operator= (const TNamed &rhs)
	TNamed assignment operator. More...

virtual void	SetNameTitle (const char name, const char title)
	Set all the TNamed parameters (name and title). More...

virtual void	SetTitle (const char *title="")
	Set the title of the TNamed. More...

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor. More...

	TObject (const TObject &object)
	TObject copy ctor. More...

virtual	~TObject ()
	TObject destructor. More...

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad. More...

ULong_t	CheckedHash ()
	Checked and record whether for this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object. More...

virtual const char *	ClassName () const
	Returns name of class to which the object belongs. More...

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object. More...

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs. More...

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad for instance with: `gROOT->SetSelectedPad(gPad)`. More...

virtual void	Dump () const
	Dump contents of object on stdout. More...

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message. More...

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py). More...

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message. More...

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object. More...

virtual const char *	GetIconName () const
	Returns mime type name of object. More...

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py). More...

virtual UInt_t	GetUniqueID () const
	Return the unique object id. More...

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out. More...

Bool_t	HasInconsistentHash () const
	Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e. More...

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message. More...

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname". More...

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl. More...

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas. More...

void	InvertBit (UInt_t f)

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory). More...

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete. More...

void	operator delete (void *ptr)
	Operator delete. More...

void	operator delete[] (void *ptr)
	Operator delete []. More...

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator. More...

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list. More...

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory. More...

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename. More...

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out". More...

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f. More...

void	SetBit (UInt_t f)

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object. More...

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id. More...

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message. More...

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message. More...

Private Types
enum	EMode { EMode::kCreate, EMode::kRecreate, EMode::kUpdate, EMode::kRead }

Private Member Functions
Long64_t	MemRead (Int_t fd, void *buf, Long64_t len) const

bool	NeedsExistingFile (EMode mode) const

bool	NeedsToWrite (EMode mode) const

TMemFile &	operator= (const TMemFile &)

EMode	ParseOption (Option_t *option)
	Parse option strings and set fOption. More...

void	ResetObjects (TDirectoryFile , TFileMergeInfo ) const
	Wipe all the data from the permanent buffer but keep, the in-memory object alive. More...

Int_t	SysClose (Int_t fd)
	Close the mem file. More...

Int_t	SysOpen (const char *pathname, Int_t flags, UInt_t mode)
	Open a file in 'MemFile'. More...

Int_t	SysRead (Int_t fd, void *buf, Int_t len)
	Read specified number of bytes from current offset into the buffer. More...

Int_t	SysReadImpl (Int_t fd, void *buf, Long64_t len)
	Read specified number of bytes from current offset into the buffer. More...

Long64_t	SysSeek (Int_t fd, Long64_t offset, Int_t whence)
	Seek to a specified position in the file. More...

Int_t	SysStat (Int_t fd, Long_t id, Long64_t size, Long_t flags, Long_t modtime)
	Perform a stat on the HDFS file; see TFile::SysStat(). More...

Int_t	SysSync (Int_t fd)
	Sync remaining data to disk. More...

Int_t	SysWrite (Int_t fd, const void *buf, Int_t len)
	Write a buffer into the file. More...

Int_t	SysWriteImpl (Int_t fd, const void *buf, Long64_t len)
	Write a buffer into the file. More...

Private Attributes
TMemBlock	fBlockList
	Collection of memory blocks of size fgDefaultBlockSize. More...

Long64_t	fBlockOffset
	Seek offset within the block. More...

TMemBlock *	fBlockSeek
	Pointer to the block we seeked to. More...

const ExternalDataPtr_t	fExternalData
	shared file data / content More...

Long64_t	fSize
	Total file size (sum of the size of the chunks) More...

Long64_t	fSysOffset
	Seek offset in file. More...

Static Private Attributes
static Long64_t	fgDefaultBlockSize = 210241024

Additional Inherited Members
Static Public Member Functions inherited from TFile
static TFileOpenHandle *	AsyncOpen (const char name, Option_t option="", const char *ftitle="", Int_t compress=1, Int_t netopt=0)
	Submit an asynchronous open request. More...

static Bool_t	Cp (const char src, const char dst, Bool_t progressbar=kTRUE, UInt_t buffersize=1000000)
	Allows to copy file from src to dst URL. More...

static TFile *&	CurrentFile ()
	Return the current ROOT file if any. More...

static EAsyncOpenStatus	GetAsyncOpenStatus (const char *name)
	Get status of the async open request related to 'name'. More...

static EAsyncOpenStatus	GetAsyncOpenStatus (TFileOpenHandle *handle)
	Get status of the async open request related to 'handle'. More...

static const char *	GetCacheFileDir ()
	Get the directory where to locally stage/cache remote files. More...

static const TUrl *	GetEndpointUrl (const char *name)
	Get final URL for file being opened asynchronously. More...

static Long64_t	GetFileBytesRead ()
	Static function returning the total number of bytes read from all files. More...

static Long64_t	GetFileBytesWritten ()
	Static function returning the total number of bytes written to all files. More...

static Long64_t	GetFileCounter ()

static Int_t	GetFileReadCalls ()
	Static function returning the total number of read calls from all files. More...

static Bool_t	GetOnlyStaged ()
	Returns staged only flag. More...

static UInt_t	GetOpenTimeout ()
	Returns open timeout (in ms). More...

static Int_t	GetReadaheadSize ()
	Static function returning the readahead buffer size. More...

static Bool_t	GetReadStreamerInfo ()
	If the streamerinfos are to be read at file opening. More...

static EFileType	GetType (const char name, Option_t option="", TString *prefix=0)
	Resolve the file type as a function of the protocol field in 'name'. More...

static void	IncrementFileCounter ()

static TFile *	Open (const char name, Option_t option="", const char *ftitle="", Int_t compress=1, Int_t netopt=0)
	Create / open a file. More...

static TFile *	Open (TFileOpenHandle *handle)
	Waits for the completion of an asynchronous open request. More...

static Bool_t	SetCacheFileDir (ROOT::Internal::TStringView cacheDir, Bool_t operateDisconnected=kTRUE, Bool_t forceCacheread=kFALSE)

static Bool_t	SetCacheFileDir (std::string_view cacheDir, Bool_t operateDisconnected=kTRUE, Bool_t forceCacheread=kFALSE)
	Sets the directory where to locally stage/cache remote files. More...

static void	SetFileBytesRead (Long64_t bytes=0)

static void	SetFileBytesWritten (Long64_t bytes=0)

static void	SetFileReadCalls (Int_t readcalls=0)

static Bool_t	SetOnlyStaged (Bool_t onlystaged)
	Sets only staged flag. More...

static UInt_t	SetOpenTimeout (UInt_t timeout)
	Sets open timeout time (in ms). Returns previous timeout value. More...

static void	SetReadaheadSize (Int_t bufsize=256000)

static void	SetReadStreamerInfo (Bool_t readinfo=kTRUE)
	Specify if the streamerinfos must be read at file opening. More...

static Bool_t	ShrinkCacheFileDir (Long64_t shrinkSize, Long_t cleanupInteval=0)
	Try to shrink the cache to the desired size. More...

Static Public Member Functions inherited from TDirectory
static void	AddDirectory (Bool_t add=kTRUE)
	Sets the flag controlling the automatic add objects like histograms, TGraph2D, etc in memory. More...

static Bool_t	AddDirectoryStatus ()
	Static function: see TDirectory::AddDirectory for more comments. More...

static Bool_t	Cd (const char *path)
	Change current directory to "path". More...

static TDirectory *&	CurrentDirectory ()
	Return the current directory for the current thread. More...

static void	DecodeNameCycle (const char namecycle, char name, Short_t &cycle, const size_t namesize=0)
	Decode a namecycle "aap;2" into name "aap" and cycle "2". More...

static void	EncodeNameCycle (char buffer, const char name, Short_t cycle)
	Encode the name and cycle into buffer like: "aap;2". More...

Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...

static Bool_t	GetObjectStat ()
	Get status of object stat flag. More...

static void	SetDtorOnly (void *obj)
	Set destructor only flag. More...

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable. More...

Protected Member Functions inherited from TFile
virtual Long64_t	DirCreateEntry (TDirectory *)

virtual Int_t	DirReadKeys (TDirectory *)

virtual void	DirWriteHeader (TDirectory *)

virtual void	DirWriteKeys (TDirectory *)

Bool_t	FlushWriteCache ()
	Flush the write cache if active. More...

virtual EAsyncOpenStatus	GetAsyncOpenStatus ()

virtual InfoListRet	GetStreamerInfoListImpl (bool lookupSICache)
	See documentation of GetStreamerInfoList for more details. More...

virtual void	Init (Bool_t create)
	Initialize a TFile object. More...

Int_t	MakeProjectParMake (const char packname, const char filename)
	Create makefile at 'filemake' for PAR package 'pack'. More...

Int_t	MakeProjectParProofInf (const char packname, const char proofinfdir)
	Create BUILD.sh and SETUP.C under 'proofinf' for PAR package 'pack'. More...

Int_t	ReadBufferViaCache (char *buf, Int_t len)
	Read buffer via cache. More...

Int_t	WriteBufferViaCache (const char *buf, Int_t len)
	Write buffer via cache. More...

Protected Member Functions inherited from TDirectoryFile
virtual void	CleanTargets ()
	Clean the pointers to this object (gDirectory, TContext, etc.) More...

void	Init (TClass *cl=0)
	Initialize the key associated with this directory (and the related data members. More...

Protected Member Functions inherited from TDirectory
	TDirectory (const TDirectory &directory)
	Copy constructor. More...

Bool_t	cd1 (const char *path)
	flag to add histograms, graphs,etc to the directory More...

void	FillFullPath (TString &buf) const
	Recursive method to fill full path for directory. More...

void	operator= (const TDirectory &)

void	RegisterContext (TContext *ctxt)
	Register a TContext pointing to this TDirectory object. More...

void	UnregisterContext (TContext *ctxt)
	UnRegister a TContext pointing to this TDirectory object. More...

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

void	MakeZombie ()

Static Protected Member Functions inherited from TDirectory
static Bool_t	Cd1 (const char *path)
	Change current directory to "path". More...

Protected Attributes inherited from TFile
TArchiveFile *	fArchive
	!Archive file from which we read this file More...

Long64_t	fArchiveOffset
	!Offset at which file starts in archive More...

TFileOpenHandle *	fAsyncHandle
	!For proper automatic cleanup More...

EAsyncOpenStatus	fAsyncOpenStatus
	!Status of an asynchronous open request More...

Long64_t	fBEGIN
	First used byte in file. More...

Long64_t	fBytesRead
	Number of bytes read from this file. More...

Long64_t	fBytesReadExtra
	Number of extra bytes (overhead) read by the readahead buffer. More...

Long64_t	fBytesWrite
	Number of bytes written to this file. More...

TFileCacheRead *	fCacheRead
	!Pointer to the read cache (if any) More...

TMap *	fCacheReadMap
	!Pointer to the read cache (if any) More...

TFileCacheWrite *	fCacheWrite
	!Pointer to the write cache (if any) More...

TArrayC *	fClassIndex
	!Index of TStreamerInfo classes written to this file More...

Int_t	fCompress
	Compression level and algorithm. More...

Int_t	fD
	File descriptor. More...

Long64_t	fEND
	Last used byte in file. More...

TList *	fFree
	Free segments linked list table. More...

TList *	fInfoCache
	!Cached list of the streamer infos in this file More...

Bool_t	fInitDone: 1
	!True if the file has been initialized More...

Bool_t	fIsArchive: 1
	!True if this is a pure archive file More...

Bool_t	fIsPcmFile: 1
	!True if the file is a ROOT pcm file. More...

Bool_t	fIsRootFile: 1
	!True is this is a ROOT file, raw file otherwise More...

Bool_t	fMustFlush: 1
	!True if the file buffers must be flushed More...

Int_t	fNbytesFree
	Number of bytes for free segments structure. More...

Int_t	fNbytesInfo
	Number of bytes for StreamerInfo record. More...

Bool_t	fNoAnchorInName: 1
	!True if we don't want to force the anchor to be appended to the file name More...

Int_t	fNProcessIDs
	Number of TProcessID written to this file. More...

Long64_t	fOffset
	!Seek offset cache More...

TList *	fOpenPhases
	!Time info about open phases More...

TString	fOption
	File options. More...

TObjArray *	fProcessIDs
	!Array of pointers to TProcessIDs More...

Int_t	fReadCalls
	Number of read calls ( not counting the cache calls ) More...

TString	fRealName
	Effective real file name (not original url) More...

Long64_t	fSeekFree
	Location on disk of free segments structure. More...

Long64_t	fSeekInfo
	Location on disk of StreamerInfo record. More...

Double_t	fSum2Buffer
	Sum of squares of buffer sizes of objects written so far. More...

Double_t	fSumBuffer
	Sum of buffer sizes of objects written so far. More...

Char_t	fUnits
	Number of bytes for file pointers. More...

TUrl	fUrl
	!URL of file More...

Int_t	fVersion
	File format version. More...

std::mutex	fWriteMutex
	!Lock for writing baskets / keys into the file. More...

Int_t	fWritten
	Number of objects written so far. More...

Protected Attributes inherited from TDirectoryFile
Int_t	fBufferSize
	Default buffer size to create new TKeys. More...

TDatime	fDatimeC
	Date and time when directory is created. More...

TDatime	fDatimeM
	Date and time of last modification. More...

TFile *	fFile
	Pointer to current file in memory. More...

TList *	fKeys
	Pointer to keys list in memory. More...

Bool_t	fModified
	True if directory has been modified. More...

Int_t	fNbytesKeys
	Number of bytes for the keys. More...

Int_t	fNbytesName
	Number of bytes in TNamed at creation time. More...

Long64_t	fSeekDir
	Location of directory on file. More...

Long64_t	fSeekKeys
	Location of Keys record on file. More...

Long64_t	fSeekParent
	Location of parent directory on file. More...

Bool_t	fWritable
	True if directory is writable. More...

Protected Attributes inherited from TDirectory
TContext *	fContext
	Buffer for GetPath() function. More...

std::atomic< size_t >	fContextPeg
	Pointer to a list of TContext object pointing to this TDirectory. More...

TList *	fList

TObject *	fMother

TString	fPathBuffer

std::atomic_flag	fSpinLock
	Counter delaying the TDirectory destructor from finishing. More...

TUUID	fUUID

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Static Protected Attributes inherited from TFile
static TList *	fgAsyncOpenRequests = 0

static std::atomic< Long64_t >	fgBytesRead {0}
	Number of bytes read by all TFile objects. More...

static std::atomic< Long64_t >	fgBytesWrite {0}
	Number of bytes written by all TFile objects. More...

static TString	fgCacheFileDir
	Directory where to locally stage files. More...

static Bool_t	fgCacheFileDisconnected = kTRUE
	Indicates, we trust in the files in the cache dir without stat on the cached file. More...

static Bool_t	fgCacheFileForce = kFALSE
	Indicates, to force all READ to CACHEREAD. More...

static std::atomic< Long64_t >	fgFileCounter {0}
	Counter for all opened files. More...

static Bool_t	fgOnlyStaged = 0
	Before the file is opened, it is checked, that the file is staged, if not, the open fails. More...

static UInt_t	fgOpenTimeout = TFile::kEternalTimeout
	Timeout for open operations in ms - 0 corresponds to blocking i/o. More...

static Int_t	fgReadaheadSize = 256000
	Readahead buffer size. More...

static std::atomic< Int_t >	fgReadCalls {0}
	Number of bytes read from all TFile objects. More...

static Bool_t	fgReadInfo = kTRUE
	if true (default) ReadStreamerInfo is called when opening a file More...

static ROOT::TRWSpinLock	fgRwLock
	!Read-write lock to protect global PID list More...

static ROOT::Internal::RConcurrentHashColl	fgTsSIHashes
	!TS Set of hashes built from read streamer infos More...

Static Protected Attributes inherited from TDirectory
static Bool_t	fgAddDirectory = kTRUE
	MSVC doesn't support = ATOMIC_FLAG_INIT;. More...

#include <TMemFile.h>

Inheritance diagram for TMemFile:

[legend]

Member Typedef Documentation

◆ ExternalDataPtr_t

using TMemFile::ExternalDataPtr_t = std::shared_ptr<const std::vector<char> >

Definition at line 21 of file TMemFile.h.

Member Enumeration Documentation

◆ EMode

enum TMemFile::EMode

strongprivate

Enumerator
kCreate
kRecreate
kUpdate
kRead

Definition at line 65 of file TMemFile.h.

Constructor & Destructor Documentation

◆ TMemFile() [1/4]

TMemFile::TMemFile	(	const char *	name,
		Option_t *	option = `""`,
		const char *	ftitle = `""`,
		Int_t	compress = `1`
	)

Usual Constructor. See the TFile constructor for details.

Definition at line 142 of file TMemFile.cxx.

◆ TMemFile() [2/4]

TMemFile::TMemFile	(	const char *	name,
		char *	buffer,
		Long64_t	size,
		Option_t *	option = `""`,
		const char *	ftitle = `""`,
		Int_t	compress = `1`
	)

Usual Constructor. See the TFile constructor for details. Copy data from buffer.

Definition at line 149 of file TMemFile.cxx.

◆ TMemFile() [3/4]

TMemFile::TMemFile	(	const char *	name,
		ExternalDataPtr_t	data
	)

Constructor to create a TMemFile re-using external storage.

Definition at line 119 of file TMemFile.cxx.

◆ TMemFile() [4/4]

TMemFile::TMemFile ( const TMemFile & orig )

Copying the content of the TMemFile into another TMemFile.

Definition at line 192 of file TMemFile.cxx.

◆ ~TMemFile()

TMemFile::~TMemFile ( )

virtual

Close and clean-up file.

Definition at line 214 of file TMemFile.cxx.

Member Function Documentation

◆ CopyTo() [1/2]

Long64_t TMemFile::CopyTo	(	void *	to,
		Long64_t	maxsize
	)		const

virtual

Copy the binary representation of the TMemFile into the memory area starting at 'to' and of length at most 'maxsize' returns the number of bytes actually copied.

Definition at line 233 of file TMemFile.cxx.

◆ CopyTo() [2/2]

void TMemFile::CopyTo ( TBuffer & tobuf ) const

virtual

Copy the binary representation of the TMemFile into the TBuffer tobuf.

Definition at line 256 of file TMemFile.cxx.

◆ GetSize()

Long64_t TMemFile::GetSize ( ) const

virtual

Return the current size of the memory file.

Reimplemented from TFile.

Definition at line 268 of file TMemFile.cxx.

◆ MemRead()

Long64_t TMemFile::MemRead	(	Int_t	fd,
		void *	buf,
		Long64_t	len
	)		const

private

◆ NeedsExistingFile()

bool TMemFile::NeedsExistingFile ( EMode mode ) const

inlineprivate

Definition at line 73 of file TMemFile.h.

◆ NeedsToWrite()

bool TMemFile::NeedsToWrite ( EMode mode ) const

inlineprivate

Definition at line 72 of file TMemFile.h.

◆ operator=()

TMemFile& TMemFile::operator= ( const TMemFile & )

private

◆ ParseOption()

TMemFile::EMode TMemFile::ParseOption ( Option_t * option )

private

Parse option strings and set fOption.

Definition at line 96 of file TMemFile.cxx.

◆ Print()

void TMemFile::Print ( Option_t * option = "" ) const

virtual

Print all objects in the file.

Reimplemented from TFile.

Definition at line 276 of file TMemFile.cxx.

◆ ResetAfterMerge()

void TMemFile::ResetAfterMerge ( TFileMergeInfo * info )

virtual

Wipe all the data from the permanent buffer but keep, the in-memory object alive.

Reimplemented from TDirectoryFile.

Definition at line 298 of file TMemFile.cxx.

◆ ResetErrno()

void TMemFile::ResetErrno ( ) const

virtual

Simply calls TSystem::ResetErrno().

Reimplemented from TFile.

Definition at line 666 of file TMemFile.cxx.

◆ ResetObjects()

void TMemFile::ResetObjects	(	TDirectoryFile *	directory,
		TFileMergeInfo *	info
	)		const

private

Wipe all the data from the permanent buffer but keep, the in-memory object alive.

Definition at line 365 of file TMemFile.cxx.

◆ SysClose()

Int_t TMemFile::SysClose ( Int_t fd )

privatevirtual

Close the mem file.

Reimplemented from TFile.

Definition at line 568 of file TMemFile.cxx.

◆ SysOpen()

Int_t TMemFile::SysOpen	(	const char *	pathname,
		Int_t	flags,
		UInt_t	mode
	)

privatevirtual

Open a file in 'MemFile'.

Reimplemented from TFile.

Definition at line 551 of file TMemFile.cxx.

◆ SysRead()

Int_t TMemFile::SysRead	(	Int_t	fd,
		void *	buf,
		Int_t	len
	)

privatevirtual

Read specified number of bytes from current offset into the buffer.

See documentation for TFile::SysRead().

Reimplemented from TFile.

Definition at line 466 of file TMemFile.cxx.

◆ SysReadImpl()

Int_t TMemFile::SysReadImpl	(	Int_t	fd,
		void *	buf,
		Long64_t	len
	)

private

Read specified number of bytes from current offset into the buffer.

See documentation for TFile::SysRead().

Definition at line 408 of file TMemFile.cxx.

◆ SysSeek()

Long64_t TMemFile::SysSeek	(	Int_t	fd,
		Long64_t	offset,
		Int_t	whence
	)

privatevirtual

Seek to a specified position in the file.

See TFile::SysSeek(). Note that TMemFile does not support seeks when the file is open for write.

Reimplemented from TFile.

Definition at line 475 of file TMemFile.cxx.

◆ SysStat()

Int_t TMemFile::SysStat	(	Int_t	fd,
		Long_t *	id,
		Long64_t *	size,
		Long_t *	flags,
		Long_t *	modtime
	)

privatevirtual

Perform a stat on the HDFS file; see TFile::SysStat().

Reimplemented from TFile.

Definition at line 648 of file TMemFile.cxx.

◆ SysSync()

Int_t TMemFile::SysSync ( Int_t fd )

privatevirtual

Sync remaining data to disk.

Nothing to do here.

Reimplemented from TFile.

Definition at line 658 of file TMemFile.cxx.

◆ SysWrite()

Int_t TMemFile::SysWrite	(	Int_t	fd,
		const void *	buf,
		Int_t	len
	)

privatevirtual

Write a buffer into the file.

Reimplemented from TFile.

Definition at line 640 of file TMemFile.cxx.

◆ SysWriteImpl()

Int_t TMemFile::SysWriteImpl	(	Int_t	fd,
		const void *	buf,
		Long64_t	len
	)

private

Write a buffer into the file.

Definition at line 576 of file TMemFile.cxx.

Member Data Documentation

◆ fBlockList

TMemBlock TMemFile::fBlockList

private

Collection of memory blocks of size fgDefaultBlockSize.

Definition at line 41 of file TMemFile.h.

◆ fBlockOffset

Long64_t TMemFile::fBlockOffset

private

Seek offset within the block.

Definition at line 46 of file TMemFile.h.

◆ fBlockSeek

TMemBlock* TMemFile::fBlockSeek

private

Pointer to the block we seeked to.

Definition at line 45 of file TMemFile.h.

◆ fExternalData

const ExternalDataPtr_t TMemFile::fExternalData

private

shared file data / content

Definition at line 42 of file TMemFile.h.

◆ fgDefaultBlockSize

Long64_t TMemFile::fgDefaultBlockSize = 2*1024*1024

staticprivate

Definition at line 48 of file TMemFile.h.

◆ fSize

Long64_t TMemFile::fSize

private

Total file size (sum of the size of the chunks)

Definition at line 43 of file TMemFile.h.

◆ fSysOffset

Long64_t TMemFile::fSysOffset

private

Seek offset in file.

Definition at line 44 of file TMemFile.h.

Libraries for TMemFile:

[legend]

Classes

Public Types

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Additional Inherited Members

Member Typedef Documentation

◆ ExternalDataPtr_t

Member Enumeration Documentation

◆ EMode

Constructor & Destructor Documentation

◆ TMemFile() [1/4]

◆ TMemFile() [2/4]

◆ TMemFile() [3/4]

◆ TMemFile() [4/4]

◆ ~TMemFile()

Member Function Documentation

◆ CopyTo() [1/2]

◆ CopyTo() [2/2]

◆ GetSize()

◆ MemRead()

◆ NeedsExistingFile()

◆ NeedsToWrite()

◆ operator=()

◆ ParseOption()

◆ Print()

◆ ResetAfterMerge()

◆ ResetErrno()

◆ ResetObjects()

◆ SysClose()

◆ SysOpen()

◆ SysRead()

◆ SysReadImpl()

◆ SysSeek()

◆ SysStat()

◆ SysSync()

◆ SysWrite()

◆ SysWriteImpl()

Member Data Documentation

◆ fBlockList

◆ fBlockOffset

◆ fBlockSeek

◆ fExternalData

◆ fgDefaultBlockSize

◆ fSize

◆ fSysOffset