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Reference Guide
TGFALFile.h
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1// @(#)root/gfal:$Id$
2// Author: Fons Rademakers 8/12/2005
3
4/*************************************************************************
5 * Copyright (C) 1995-2005, Rene Brun and Fons Rademakers. *
6 * All rights reserved. *
7 * *
8 * For the licensing terms see $ROOTSYS/LICENSE. *
9 * For the list of contributors see $ROOTSYS/README/CREDITS. *
10 *************************************************************************/
11
12#ifndef ROOT_TGFALFile
13#define ROOT_TGFALFile
14
15#include "TFile.h"
16#include "TSystem.h"
17
18
19class TGFALFile : public TFile {
20
21private:
22 Bool_t fStatCached; ///<! (transient) is file status cached?
23 struct stat64 fStatBuffer; ///<! (transient) Cached file status buffer (for performance)
24
26
27 // Interface to basic system I/O routines
28 Int_t SysOpen(const char *pathname, Int_t flags, UInt_t mode);
30 Int_t SysRead(Int_t fd, void *buf, Int_t len);
31 Int_t SysWrite(Int_t fd, const void *buf, Int_t len);
32 Long64_t SysSeek(Int_t fd, Long64_t offset, Int_t whence);
33 Int_t SysStat(Int_t fd, Long_t *id, Long64_t *size, Long_t *flags, Long_t *modtime);
34 Int_t SysSync(Int_t) { /* no fsync for GFAL */ return 0; }
35
36public:
37 TGFALFile(const char *url, Option_t *option="",
38 const char *ftitle="", Int_t compress = ROOT::RCompressionSetting::EDefaults::kUseGeneralPurpose);
39 ~TGFALFile();
40
41 Bool_t ReadBuffer(char *buf, Int_t len);
42 Bool_t ReadBuffer(char *buf, Long64_t pos, Int_t len);
43 Bool_t WriteBuffer(const char *buf, Int_t len);
44
45 ClassDef(TGFALFile,1) //A ROOT file that reads/writes via a GFAL
46};
47
48
49class TGFALSystem : public TSystem {
50
51private:
52 void *fDirp; // directory handler
53
54 void *GetDirPtr() const { return fDirp; }
55
56public:
58 virtual ~TGFALSystem() { }
59
60 Int_t MakeDirectory(const char *name);
61 void *OpenDirectory(const char *name);
62 void FreeDirectory(void *dirp);
63 const char *GetDirEntry(void *dirp);
64 Int_t GetPathInfo(const char *path, FileStat_t &buf);
65 Bool_t AccessPathName(const char *path, EAccessMode mode);
66
67 ClassDef(TGFALSystem,0) // Directory handler for GFAL
68};
69
70#endif
int Int_t
Definition: RtypesCore.h:41
unsigned int UInt_t
Definition: RtypesCore.h:42
const Bool_t kFALSE
Definition: RtypesCore.h:88
long Long_t
Definition: RtypesCore.h:50
bool Bool_t
Definition: RtypesCore.h:59
long long Long64_t
Definition: RtypesCore.h:69
const char Option_t
Definition: RtypesCore.h:62
#define ClassDef(name, id)
Definition: Rtypes.h:324
EAccessMode
Definition: TSystem.h:44
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition: TFile.h:48
Read and write data via the underlying Grid access mechanism.
Definition: TGFALFile.h:19
TGFALFile()
Definition: TGFALFile.h:25
Long64_t SysSeek(Int_t fd, Long64_t offset, Int_t whence)
Interface to system lseek.
Definition: TGFALFile.cxx:236
~TGFALFile()
GFAL file dtor. Close and flush directory structure.
Definition: TGFALFile.cxx:186
Int_t SysClose(Int_t fd)
Interface to system close. All arguments like in POSIX close.
Definition: TGFALFile.cxx:204
struct stat64 fStatBuffer
! (transient) Cached file status buffer (for performance)
Definition: TGFALFile.h:23
Int_t SysSync(Int_t)
Interface to system fsync. All arguments like in POSIX fsync().
Definition: TGFALFile.h:34
Int_t SysWrite(Int_t fd, const void *buf, Int_t len)
Interface to system write. All arguments like in POSIX write.
Definition: TGFALFile.cxx:224
Int_t SysStat(Int_t fd, Long_t *id, Long64_t *size, Long_t *flags, Long_t *modtime)
Interface to TSystem:GetPathInfo().
Definition: TGFALFile.cxx:247
Bool_t WriteBuffer(const char *buf, Int_t len)
Write specified byte range to remote file via GFAL.
Definition: TGFALFile.cxx:320
Int_t SysRead(Int_t fd, void *buf, Int_t len)
Interface to system read. All arguments like in POSIX read.
Definition: TGFALFile.cxx:214
Bool_t ReadBuffer(char *buf, Int_t len)
Read specified byte range from remote file via GFAL.
Definition: TGFALFile.cxx:287
Int_t SysOpen(const char *pathname, Int_t flags, UInt_t mode)
Interface to system open. All arguments like in POSIX open.
Definition: TGFALFile.cxx:194
Bool_t fStatCached
! (transient) is file status cached?
Definition: TGFALFile.h:22
Directory handler for GFAL.
Definition: TGFALFile.h:49
virtual ~TGFALSystem()
Definition: TGFALFile.h:58
void * OpenDirectory(const char *name)
Open a directory via GFAL.
Definition: TGFALFile.cxx:368
const char * GetDirEntry(void *dirp)
Get directory entry via GFAL. Returns 0 in case no more entries.
Definition: TGFALFile.cxx:409
Int_t GetPathInfo(const char *path, FileStat_t &buf)
Get info about a file.
Definition: TGFALFile.cxx:433
Bool_t AccessPathName(const char *path, EAccessMode mode)
Returns FALSE if one can access a file using the specified access mode.
Definition: TGFALFile.cxx:460
TGFALSystem()
Create helper class that allows directory access via GFAL.
Definition: TGFALFile.cxx:344
void * GetDirPtr() const
Definition: TGFALFile.h:54
void * fDirp
Definition: TGFALFile.h:52
void FreeDirectory(void *dirp)
Free directory via GFAL.
Definition: TGFALFile.cxx:393
Int_t MakeDirectory(const char *name)
Make a directory via GFAL.
Definition: TGFALFile.cxx:355
Abstract base class defining a generic interface to the underlying Operating System.
Definition: TSystem.h:248
@ kUseGeneralPurpose
Use the recommended general-purpose setting; moderate read / write speed and compression ratio.
Definition: Compression.h:53