| # Gaudi Framework, version v23r1 |

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# Gaudi::RootDataConnection Class Reference

Concrete implementation of the IDataConnection interface to access ROOT files. More...

`#include <GaudiRootCnv/RootDataConnection.h>`

Inheritance diagram for Gaudi::RootDataConnection:
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Collaboration diagram for Gaudi::RootDataConnection:
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List of all members.

## Classes
class | ContainerSection
| Internal helper class, which described a TBranch section in a ROOT file. More...
class | Tool
| Helper class to facilitate an abstraction layer for reading POOL style files with this package. More...
## Public Types
typedef std::vector< std::string > | StringVec
| Type definition for string maps.
typedef std::vector< std::pair < std::string, std::string > > | ParamMap
| Type definition for the parameter map.
typedef std::map< std::string, TTree * > | Sections
| Definition of tree sections.
typedef std::vector < ContainerSection > | ContainerSections
| Definition of container sections to handle merged files.
typedef std::map< std::string, ContainerSections > | MergeSections
| Definition of database section to handle merged files.
typedef std::vector< RootRef > | LinkSections
| Link sections definition.
typedef std::set< const IInterface * > | Clients
| Client set.
## Public Member Functions
MsgStream & | msgSvc () const
| Allow access to printer service.
Tool * | makeTool ()
| Create file access tool to encapsulate POOL compatibiliy.
| RootDataConnection (const IInterface *own, const std::string &nam, RootConnectionSetup *setup)
| Standard constructor.
virtual | ~RootDataConnection ()
| Standard destructor.
TFile * | file () const
| Direct access to TFile structure.
virtual bool | isConnected () const
| Check if connected to data source.
bool | isWritable () const
| Is the file writable?
Tool * | tool () const
| Access tool.
const MergeSections & | mergeSections () const
| Access merged data section inventory.
const StringVec & | mergeFIDs () const
| Access merged FIDs.
void | addClient (const IInterface *client)
| Add new client to this data source.
size_t | removeClient (const IInterface *client)
| Remove client from this data source.
bool | lookupClient (const IInterface *client) const
| Lookup client for this data source.
std::pair< const RootRef *, const ContainerSection * > | getMergeSection (const std::string &container, int entry) const
| Access link section for single container and entry.
void | enableStatistics (const std::string &section)
| Enable TTreePerStats.
void | saveStatistics (const std::string &statisticsFile)
| Save TTree access statistics if required.
int | loadObj (const std::string &section, const std::string &cnt, unsigned long entry, DataObject *&pObj)
| Load object.
int | loadRefs (const std::string &section, const std::string &cnt, unsigned long entry, RootObjectRefs &refs)
| Load references object.
std::pair< int, unsigned long > | saveObj (const std::string &section, const std::string &cnt, TClass *cl, DataObject *pObj, bool fill_missing=false)
| Save object of a given class to section and container.
std::pair< int, unsigned long > | save (const std::string &section, const std::string &cnt, TClass *cl, void *pObj, bool fill_missing=false)
| Save object of a given class to section and container.
virtual StatusCode | connectRead ()
| Open data stream in read mode.
virtual StatusCode | connectWrite (IoType typ)
| Open data stream in write mode.
virtual StatusCode | disconnect ()
| Release data stream and release implementation dependent resources.
virtual StatusCode | read (void *const, size_t)
| Read root byte buffer from input stream.
virtual StatusCode | write (const void *, int)
| Write root byte buffer to output stream.
virtual long long int | seek (long long int, int)
| Seek on the file described by ioDesc. Arguments as in seek()
TTree * | getSection (const std::string &sect, bool create=false)
| Access TTree section from section name. The section is created if required.
TBranch * | getBranch (const std::string &section, const std::string &branch_name)
| Access data branch by name: Get existing branch in read only mode.
TBranch * | getBranch (const std::string &section, const std::string &branch_name, TClass *cl, void *ptr)
| Access data branch by name: Get existing branch in write mode.
void | makeRef (IRegistry *pA, RootRef &ref)
| Create reference object from registry entry.
void | makeRef (const std::string &name, long clid, int tech, const std::string &db, const std::string &cnt, int entry, RootRef &ref)
| Create reference object from values.
int | makeLink (const std::string &p)
| Convert path string to path index.
const std::string & | getDb (int which) const
| Access database/file name from saved index.
const std::string & | getCont (int which) const
| Access container name from saved index.
const std::string & | getLink (int which) const
| Access link name from saved index.
## Public Attributes
class Gaudi::RootDataConnection::Tool * | m_tool
## Protected Member Functions
const std::string & | empty () const
| Empty string reference.
StatusCode | saveRefs ()
| Internal helper to save/update reference tables.
## Protected Attributes
RootConnectionSetup * | m_setup
| Reference to the setup structure.
TTreePerfStats * | m_statistics
| I/O read statistics from TTree.
TFile * | m_file
| Reference to ROOT file.
TTree * | m_refs
| Pointer to the reference tree.
Sections | m_sections
| Tree sections in TFile.
StringVec | m_dbs
| Map containing external database file names (fids)
StringVec | m_conts
| Map containing external container names.
StringVec | m_links
| Map containing internal links names.
StringVec | m_mergeFIDs
| Map containing merge FIDs.
ParamMap | m_params
| Parameter map for file parameters.
MergeSections | m_mergeSects
| Database section map for merged files.
LinkSections | m_linkSects
| Database link sections.
Clients | m_clients
| Client list.
std::string | m_empty
| Buffer for empty string reference.
## Friends
class | Tool

## Detailed Description

Concrete implementation of the IDataConnection interface to access ROOT files.

Author:
  M.Frank

Version:
  1.0

Date:
  20/12/2009

Definition at line 95 of file RootDataConnection.h.

## Member Typedef Documentation

typedef std::set<const IInterface*> Gaudi::RootDataConnection::Clients

Client set.

Definition at line 136 of file RootDataConnection.h.

typedef std::vector<ContainerSection> Gaudi::RootDataConnection::ContainerSections

Definition of container sections to handle merged files.

Definition at line 130 of file RootDataConnection.h.

typedef std::vector<RootRef> Gaudi::RootDataConnection::LinkSections

Link sections definition.

Definition at line 134 of file RootDataConnection.h.

typedef std::map<std::string,ContainerSections> Gaudi::RootDataConnection::MergeSections

Definition of database section to handle merged files.

Definition at line 132 of file RootDataConnection.h.

typedef std::vector<std::pair<std::string,std::string> > Gaudi::RootDataConnection::ParamMap

Type definition for the parameter map.

Definition at line 126 of file RootDataConnection.h.

typedef std::map<std::string,TTree*> Gaudi::RootDataConnection::Sections

Definition of tree sections.

Definition at line 128 of file RootDataConnection.h.

typedef std::vector<std::string> Gaudi::RootDataConnection::StringVec

Type definition for string maps.

Definition at line 124 of file RootDataConnection.h.

## Constructor & Destructor Documentation

Gaudi::RootDataConnection::RootDataConnection | ( | const IInterface * | own,
|  | const std::string & | nam,
|  | RootConnectionSetup * | setup
| ) |  |

Standard constructor.

RootDataConnection::~RootDataConnection | ( | ) | `[virtual]`

Standard destructor.

Definition at line 163 of file RootDataConnection.cpp.

                                              {
      m_setup->release();
      releasePtr(m_tool);
    }

## Member Function Documentation

void RootDataConnection::addClient | ( | const IInterface * | client ) |

Add new client to this data source.

Definition at line 169 of file RootDataConnection.cpp.

                                                               {
      m_clients.insert(client);
    }

StatusCode RootDataConnection::connectRead | ( | ) | `[virtual]`

Open data stream in read mode.

Implements Gaudi::IDataConnection.

Definition at line 224 of file RootDataConnection.cpp.

                                                {
      m_file = TFile::Open(m_pfn.c_str());
      if ( m_file && !m_file->IsZombie() )   {
        StatusCode sc = StatusCode::FAILURE;
        msgSvc() << MSG::DEBUG << "Opened file " << m_pfn << " in mode READ. [" << m_fid << "]" << endmsg << MSG::DEBUG;
        if ( msgSvc().isActive() ) m_file->ls();
        msgSvc() << MSG::VERBOSE;
        if ( msgSvc().isActive() ) m_file->Print();
        if ( makeTool() ) sc = m_tool->readRefs();
        if ( sc.isSuccess() ) {
          bool need_fid = m_fid == m_pfn;
          string fid = m_fid;
          m_mergeFIDs.clear();
          for(size_t i=0, n=m_params.size(); i<n; ++i) {
            if ( m_params[i].first == "FID" )  {
              m_mergeFIDs.push_back(m_params[i].second);
              if ( m_params[i].second != m_fid )    {
                msgSvc() << MSG::DEBUG << "Check FID param:" << m_params[i].second << endmsg;
                //if ( m_fid == m_pfn ) {
                m_fid = m_params[i].second;
                //}
              }
            }
          }
          if ( !need_fid && fid != m_fid ) {
            msgSvc() << MSG::ERROR << "FID mismatch:" << fid << "(Catalog) != " << m_fid << "(file)" << endmsg
              << "for PFN:" << m_pfn << endmsg;
            return StatusCode::FAILURE;
          }
          msgSvc() << MSG::DEBUG << "Using FID " << m_fid << " from params table...." << endmsg
            << "for PFN:" << m_pfn << endmsg;
          return sc;
        }
      }
      else if ( m_file ) {
        deletePtr(m_file);
      }
      return StatusCode::FAILURE;
    }

StatusCode RootDataConnection::connectWrite | ( | IoType | typ ) | `[virtual]`

Open data stream in write mode.

Implements Gaudi::IDataConnection.

Definition at line 265 of file RootDataConnection.cpp.

                                                           {
      int compress = RootConnectionSetup::compression();
      msgSvc() << MSG::DEBUG;
      switch(typ)  {
      case CREATE:
        resetAge();
        m_file = TFile::Open(m_pfn.c_str(),"CREATE","Root event data",compress);
        m_refs = new TTree("Refs","Root reference data");
        msgSvc() << "Opened file " << m_pfn << " in mode CREATE. [" << m_fid << "]" << endmsg;
        m_params.push_back(make_pair("PFN",m_pfn));
        if ( m_fid != m_pfn ) {
          m_params.push_back(make_pair("FID",m_fid));
        }
        makeTool();
        break;
      case RECREATE:
        resetAge();
        m_file = TFile::Open(m_pfn.c_str(),"RECREATE","Root event data",compress);
        msgSvc() << "Opened file " << m_pfn << " in mode RECREATE. [" << m_fid << "]" << endmsg;
        m_refs = new TTree("Refs","Root reference data");
        m_params.push_back(make_pair("PFN",m_pfn));
        if ( m_fid != m_pfn ) {
          m_params.push_back(make_pair("FID",m_fid));
        }
        makeTool();
        break;
      case UPDATE:
        resetAge();
        m_file = TFile::Open(m_pfn.c_str(),"UPDATE","Root event data",compress);
        msgSvc() << "Opened file " << m_pfn << " in mode UPDATE. [" << m_fid << "]" << endmsg;
        if ( m_file && !m_file->IsZombie() )  {
          if ( makeTool() ) return m_tool->readRefs();
          TDirectory::TContext ctxt(m_file);
          m_refs = new TTree("Refs","Root reference data");
          makeTool();
          return StatusCode::SUCCESS;
        }
        break;
      default:
        m_refs = 0;
        m_file = 0;
        return StatusCode::FAILURE;
      }
      return 0==m_file ? StatusCode::FAILURE : StatusCode::SUCCESS;
    }

StatusCode RootDataConnection::disconnect | ( | ) | `[virtual]`

Release data stream and release implementation dependent resources.

Implements Gaudi::IDataConnection.

Definition at line 312 of file RootDataConnection.cpp.

                                                 {
      if ( m_file ) {
        if ( !m_file->IsZombie() )   {
          if ( m_file->IsWritable() ) {
            msgSvc() << MSG::DEBUG;
            TDirectory::TContext ctxt(m_file);
            if ( m_refs ) {
              m_tool->saveRefs().ignore();
              m_refs->Write();
            }
            for(Sections::iterator i=m_sections.begin(); i!= m_sections.end();++i) {
              if ( (*i).second ) {
                (*i).second->Write();
                msgSvc() << "Disconnect section " << (*i).first << " " << (*i).second->GetName() << endmsg;
              }
            }
            m_sections.clear();
          }
          msgSvc() << MSG::DEBUG;
          if ( msgSvc().isActive() ) m_file->ls();
          msgSvc() << MSG::VERBOSE;
          if ( msgSvc().isActive() ) m_file->Print();
          m_file->Close();
        }
        msgSvc() << MSG::DEBUG << "Disconnected file " << m_pfn << " " << m_file->GetName() << endmsg;
        deletePtr(m_file);
        releasePtr(m_tool);
      }
      return StatusCode::SUCCESS;
    }

CSTR RootDataConnection::empty | ( | void | ) | const`[protected]`

Empty string reference.

Definition at line 451 of file RootDataConnection.cpp.

                                         {
      return s_empty;
    }

void Gaudi::RootDataConnection::enableStatistics | ( | const std::string & | section ) |

Enable TTreePerStats.

TFile* Gaudi::RootDataConnection::file | ( | ) | const`[inline]`

Direct access to TFile structure.

Definition at line 241 of file RootDataConnection.h.

    {  return m_file;                              }

TBranch* Gaudi::RootDataConnection::getBranch | ( | const std::string & | section,
|  | const std::string & | branch_name
| ) |  | `[inline]`

Access data branch by name: Get existing branch in read only mode.

Definition at line 299 of file RootDataConnection.h.

        { return m_tool->getBranch(section,branch_name); }

TBranch* Gaudi::RootDataConnection::getBranch | ( | const std::string & | section,
|  | const std::string & | branch_name,
|  | TClass * | cl,
|  | void * | ptr
| ) |  |

Access data branch by name: Get existing branch in write mode.

const std::string& Gaudi::RootDataConnection::getCont | ( | int | which ) | const`[inline]`

Access container name from saved index.

Definition at line 316 of file RootDataConnection.h.

          { return (which>=0)&&(size_t(which)<m_conts.size()) ? *(m_conts.begin()+which) : empty();    }

CSTR RootDataConnection::getDb | ( | int | which ) | const

Access database/file name from saved index.

Definition at line 442 of file RootDataConnection.cpp.

                                                  {
      if ( (which>=0) && (size_t(which)<m_dbs.size()) )  {
        if ( *(m_dbs.begin()+which) == s_local ) return m_fid;
        return *(m_dbs.begin()+which);
      }
      return s_empty;
    }

const std::string& Gaudi::RootDataConnection::getLink | ( | int | which ) | const`[inline]`

Access link name from saved index.

Definition at line 320 of file RootDataConnection.h.

          { return (which>=0)&&(size_t(which)<m_links.size()) ? *(m_links.begin()+which) : empty();    }

pair< const RootRef *, const RootDataConnection::ContainerSection * > RootDataConnection::getMergeSection | ( | const std::string & | container,
|  | int | entry
| ) |  | const

Access link section for single container and entry.

Definition at line 540 of file RootDataConnection.cpp.

                                                                                {
      //size_t idx = cont.find('/',1);
      //string container = cont[0]=='/' ? cont.substr(1,idx==string::npos?idx:idx-1) : cont;
      MergeSections::const_iterator i=m_mergeSects.find(container);
      if ( i != m_mergeSects.end() ) {
        size_t cnt = 0;
        const ContainerSections& s = (*i).second;
        for(ContainerSections::const_iterator j=s.begin(); j != s.end(); ++j,++cnt) {
          const ContainerSection& c = *j;
          if ( entry >= c.start && entry < (c.start+c.length) ) {
            if ( m_linkSects.size() > cnt ) {
              if ( msgSvc().isActive() ) {
                msgSvc() << MSG::VERBOSE << "MergeSection for:" << container
                  << "  [" << entry << "]" << endmsg
                  << "FID:" << m_fid << " -> PFN:" << m_pfn << endmsg;
              }
              return make_pair(&(m_linkSects[cnt]), &c);
            }
          }
        }
      }
      msgSvc() << MSG::DEBUG << "Return INVALID MergeSection for:" << container
        << "  [" << entry << "]" << endmsg
        << "FID:" << m_fid << " -> PFN:" << m_pfn << endmsg;
      return make_pair((const RootRef*)0,(const ContainerSection*)0);
    }

TTree* Gaudi::RootDataConnection::getSection | ( | const std::string & | sect,
|  | bool | create = `false`
| ) |  |

Access TTree section from section name. The section is created if required.

virtual bool Gaudi::RootDataConnection::isConnected | ( | ) | const`[inline, virtual]`

Check if connected to data source.

Implements Gaudi::IDataConnection.

Definition at line 243 of file RootDataConnection.h.

    {  return m_file != 0;                         }

bool Gaudi::RootDataConnection::isWritable | ( | ) | const`[inline]`

Is the file writable?

Definition at line 245 of file RootDataConnection.h.

    {  return m_file != 0 && m_file->IsWritable(); }

int Gaudi::RootDataConnection::loadObj | ( | const std::string & | section,
|  | const std::string & | cnt,
|  | unsigned long | entry,
|  | DataObject *& | pObj
| ) |  |

Load object.

int Gaudi::RootDataConnection::loadRefs | ( | const std::string & | section,
|  | const std::string & | cnt,
|  | unsigned long | entry,
|  | RootObjectRefs & | refs
| ) |  | `[inline]`

Load references object.

Definition at line 273 of file RootDataConnection.h.

        { return m_tool->loadRefs(section,cnt,entry,refs); }

bool RootDataConnection::lookupClient | ( | const IInterface * | client ) | const

Lookup client for this data source.

Definition at line 181 of file RootDataConnection.cpp.

                                                                          {
      Clients::const_iterator i=m_clients.find(client);
      return i != m_clients.end();
    }

int Gaudi::RootDataConnection::makeLink | ( | const std::string & | p ) |

Convert path string to path index.

void RootDataConnection::makeRef | ( | IRegistry * | pA,
|  | RootRef & | ref
| ) |  |

Create reference object from registry entry.

Definition at line 568 of file RootDataConnection.cpp.

                                                                {
      IOpaqueAddress* pA = pR->address();
      makeRef(pR->name(),pA->clID(),pA->svcType(),pA->par()[0],pA->par()[1],-1,ref);
    }

void Gaudi::RootDataConnection::makeRef | ( | const std::string & | name,
|  | long | clid,
|  | int | tech,
|  | const std::string & | db,
|  | const std::string & | cnt,
|  | int | entry,
|  | RootRef & | ref
| ) |  |

Create reference object from values.

RootDataConnection::Tool * RootDataConnection::makeTool | ( | ) |

Create file access tool to encapsulate POOL compatibiliy.

Definition at line 211 of file RootDataConnection.cpp.

                                                           {
      releasePtr(m_tool);
      if ( !m_refs ) m_refs = (TTree*)m_file->Get("Refs");
      if ( m_refs )
        m_tool = new RootTool(this);
    #ifdef __POOL_COMPATIBILITY
      else if ( m_file->Get("##Links") != 0 )
        m_tool = new PoolTool(this);
    #endif
      return m_tool;
    }

const StringVec& Gaudi::RootDataConnection::mergeFIDs | ( | ) | const`[inline]`

Access merged FIDs.

Definition at line 251 of file RootDataConnection.h.

    {  return m_mergeFIDs;                         }

const MergeSections& Gaudi::RootDataConnection::mergeSections | ( | ) | const`[inline]`

Access merged data section inventory.

Definition at line 249 of file RootDataConnection.h.

    {  return m_mergeSects;                        }

MsgStream& Gaudi::RootDataConnection::msgSvc | ( | ) | const`[inline]`

Allow access to printer service.

Definition at line 139 of file RootDataConnection.h.

    {  return m_setup->msgSvc(); }

virtual StatusCode Gaudi::RootDataConnection::read | ( | void * | const,
|  | size_t |
| ) |  | `[inline, virtual]`

Read root byte buffer from input stream.

Implements Gaudi::IDataConnection.

Definition at line 289 of file RootDataConnection.h.

    { return StatusCode::FAILURE; }

size_t RootDataConnection::removeClient | ( | const IInterface * | client ) |

Remove client from this data source.

Definition at line 174 of file RootDataConnection.cpp.

                                                                    {
      Clients::iterator i=m_clients.find(client);
      if ( i != m_clients.end() ) m_clients.erase(i);
      return m_clients.size();
    }

std::pair<int,unsigned long> Gaudi::RootDataConnection::save | ( | const std::string & | section,
|  | const std::string & | cnt,
|  | TClass * | cl,
|  | void * | pObj,
|  | bool | fill_missing = `false`
| ) |  |

Save object of a given class to section and container.

std::pair<int,unsigned long> Gaudi::RootDataConnection::saveObj | ( | const std::string & | section,
|  | const std::string & | cnt,
|  | TClass * | cl,
|  | DataObject * | pObj,
|  | bool | fill_missing = `false`
| ) |  |

Save object of a given class to section and container.

StatusCode Gaudi::RootDataConnection::saveRefs | ( | ) | `[protected]`

Internal helper to save/update reference tables.

void Gaudi::RootDataConnection::saveStatistics | ( | const std::string & | statisticsFile ) |

Save TTree access statistics if required.

virtual long long int Gaudi::RootDataConnection::seek | ( | long long int | ,
|  | int |
| ) |  | `[inline, virtual]`

Seek on the file described by ioDesc. Arguments as in seek()

Implements Gaudi::IDataConnection.

Definition at line 293 of file RootDataConnection.h.

    { return -1; }

Tool* Gaudi::RootDataConnection::tool | ( | ) | const`[inline]`

Access tool.

Definition at line 247 of file RootDataConnection.h.

    {  return m_tool;                              }

virtual StatusCode Gaudi::RootDataConnection::write | ( | const void * | ,
|  | int |
| ) |  | `[inline, virtual]`

Write root byte buffer to output stream.

Implements Gaudi::IDataConnection.

Definition at line 291 of file RootDataConnection.h.

    { return StatusCode::FAILURE; }

## Friends And Related Function Documentation

friend class Tool`[friend]`

Definition at line 228 of file RootDataConnection.h.

## Member Data Documentation

Clients Gaudi::RootDataConnection::m_clients`[protected]`

Client list.

Definition at line 168 of file RootDataConnection.h.

StringVec Gaudi::RootDataConnection::m_conts`[protected]`

Map containing external container names.

Definition at line 156 of file RootDataConnection.h.

StringVec Gaudi::RootDataConnection::m_dbs`[protected]`

Map containing external database file names (fids)

Definition at line 154 of file RootDataConnection.h.

std::string Gaudi::RootDataConnection::m_empty`[protected]`

Buffer for empty string reference.

Definition at line 170 of file RootDataConnection.h.

TFile* Gaudi::RootDataConnection::m_file`[protected]`

Reference to ROOT file.

Definition at line 148 of file RootDataConnection.h.

StringVec Gaudi::RootDataConnection::m_links`[protected]`

Map containing internal links names.

Definition at line 158 of file RootDataConnection.h.

LinkSections Gaudi::RootDataConnection::m_linkSects`[protected]`

Database link sections.

Definition at line 166 of file RootDataConnection.h.

StringVec Gaudi::RootDataConnection::m_mergeFIDs`[protected]`

Map containing merge FIDs.

Definition at line 160 of file RootDataConnection.h.

MergeSections Gaudi::RootDataConnection::m_mergeSects`[protected]`

Database section map for merged files.

Definition at line 164 of file RootDataConnection.h.

ParamMap Gaudi::RootDataConnection::m_params`[protected]`

Parameter map for file parameters.

Definition at line 162 of file RootDataConnection.h.

TTree* Gaudi::RootDataConnection::m_refs`[protected]`

Pointer to the reference tree.

Definition at line 150 of file RootDataConnection.h.

Sections Gaudi::RootDataConnection::m_sections`[protected]`

Tree sections in TFile.

Definition at line 152 of file RootDataConnection.h.

RootConnectionSetup* Gaudi::RootDataConnection::m_setup`[protected]`

Reference to the setup structure.

Definition at line 144 of file RootDataConnection.h.

TTreePerfStats* Gaudi::RootDataConnection::m_statistics`[protected]`

I/O read statistics from TTree.

Definition at line 146 of file RootDataConnection.h.

class Gaudi::RootDataConnection::Tool * Gaudi::RootDataConnection::m_tool

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

- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v23r1/RootCnv/RootCnv/RootDataConnection.h
- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v23r1/RootCnv/src/RootDataConnection.cpp

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