FileCatalog Class Reference

This class provides an interface to the file (metadata) catalog. More...

#include <FileCatalog.h>

Collaboration diagram for FileCatalog:

Public Member Functions
virtual bool	registerFile (const std::string &fileName, FileMetaData &metaData, const std::string &oldLFN="")
	Register a file in the (local) file catalog. More...
virtual bool	getMetaData (std::string &fileName, FileMetaData &metaData)
	Get the metadata of a file with given (logical) file name. More...
virtual std::string	getPhysicalFileName (const std::string &lfn)
	Get the physical file name for the LFN. More...

Static Public Member Functions
static FileCatalog &	Instance ()
	Static method to get a reference to the FileCatalog instance. More...

Private Types
typedef std::map< std::string, std::pair< std::string, FileMetaData > >	FileMap
	Map with file catalog content.

Private Member Functions
	FileCatalog ()
	Constructor: locate local database file.
bool	readCatalog (FileMap &fileMap)
	Read the file catalog from the local file. More...
bool	writeCatalog (const FileMap &fileMap)
	Write the file catalog to the local file. More...

Private Attributes
std::string	m_fileName
	Name of the file catalog file.

Detailed Description

This class provides an interface to the file (metadata) catalog.

Definition at line 34 of file FileCatalog.h.

Member Function Documentation

getMetaData()

bool getMetaData ( std::string &  fileName, FileMetaData &  metaData  )

virtual

Get the metadata of a file with given (logical) file name.

Parameters

fileName	The (logical) name of the file. Will be set to the physical file name.
metaData	The meta data information of the file.

Returns

True if the file was found in the catalog.

Definition at line 144 of file FileCatalog.cc.

{
  metaData = FileMetaData();
  if (m_fileName.empty()) return false;
  if (!fs::exists(m_fileName)) return false;
 
  // get lock for read access to file catalog
  FileSystem::Lock lock(m_fileName, true);
  if (!lock.lock()) {
    B2ERROR("Locking of file catalog " << m_fileName << " failed.");
    return false;
  }
 
  // read the file catalog
  FileMap fileMap;
  if (!readCatalog(fileMap)) {
    B2ERROR("Failed to read file catalog " << m_fileName);
    return false;
  }
 
  // find the entry with given LFN
  auto iEntry = fileMap.find(fileName);
  if (iEntry != fileMap.end()) {
    metaData = iEntry->second.second;
    if (!iEntry->second.first.empty()) fileName = iEntry->second.first;
    return true;
  }
  for (const auto& entry : fileMap) {
    if (fileName.compare(entry.second.first) == 0) {
      metaData = entry.second.second;
      return true;
    }
  }
 
  return false;
}

getPhysicalFileName()

std::string getPhysicalFileName ( const std::string &  lfn )

virtual

Get the physical file name for the LFN.

Parameters

lfn	The logical file name.

Returns

the physical file name or an empty string if the lfn is not in the catalog.

Definition at line 182 of file FileCatalog.cc.

Instance()

FileCatalog & Instance ( )

static

Static method to get a reference to the FileCatalog instance.

Returns

A reference to an instance of this class.

Definition at line 25 of file FileCatalog.cc.

readCatalog()

bool readCatalog ( FileCatalog::FileMap &  fileMap )

private

Read the file catalog from the local file.

Parameters

fileMap

The map of file catalog entries.

Returns

True if the catalog was read successfully.

Definition at line 56 of file FileCatalog.cc.

registerFile()

bool registerFile ( const std::string &  fileName, FileMetaData &  metaData, const std::string &  oldLFN = ""  )

virtual

Register a file in the (local) file catalog.

Parameters

fileName	The name of the file to be registered.
metaData	The meta data information of the file to be registered. Will be updated.
oldLFN	If not empty, update the file catalog: only register the file if the oldLFN is found in the catalog and if so, also remove any file with the old LFN from the catalog.

Returns

True if the registration succeeded.

Definition at line 92 of file FileCatalog.cc.

writeCatalog()

bool writeCatalog ( const FileMap &  fileMap )

private

Write the file catalog to the local file.

Parameters

fileMap

The map of file catalog entries.

Returns

True if the catalog was written successfully.

Definition at line 79 of file FileCatalog.cc.

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

• framework/core/include/FileCatalog.h
• framework/core/src/FileCatalog.cc