TDbiCascader::Lock Class Reference

Private Locker object used by TDbiCascader. More...

Collaboration diagram for TDbiCascader::Lock:

Public Member Functions
	Lock (TDbiStatement *stmtDB, const string &seqnoTable, const string &dataTable)
	~Lock ()
	Purpose: Dtor: Clear lock.
Bool_t	IsLocked () const
Private Member Functions
void	SetLock (Bool_t setting=kTRUE)
Private Attributes
TDbiStatement *	fStmt
string	fSeqnoTableName
string	fDataTableName
Bool_t	fLocked

Detailed Description

Private Locker object used by TDbiCascader.

Definition at line 133 of file TDbiCascader.hxx.

Constructor & Destructor Documentation

TDbiCascader::Lock::Lock	(	TDbiStatement *	stmtDB,
		const string &	seqnoTable,
		const string &	dataTable
	)

   
     Purpose:  Ctor: Create a lock on a table accessed via connection.
               (will be released by dtor)
     Arguments:
             stmtDB    in  TDbiStatement (given to Lock).

Definition at line 583 of file TDbiCascader.cxx.

References fStmt, SetLock(), and SK_DBI_Severe.

00583                                                                                                :
00584 fStmt(stmtDB),
00585 fSeqnoTableName(seqnoTable),
00586 fDataTableName(dataTable),
00587 fLocked(kFALSE)
00588 {
00589 
00590 
00591   if ( ! fStmt ) {
00592        SK_DBI_Severe( "Cannot obtain statment to set lock" << "  ");
00593     return;
00594   }
00595 
00596   this->SetLock(kTRUE);
00597 
00598 }
//.....................................................................

Here is the call graph for this function:

TDbiCascader::Lock::~Lock ( )

Purpose: Dtor: Clear lock.

Definition at line 601 of file TDbiCascader.cxx.

References fStmt, and SetLock().

00601                         {
00602 //
00603 //
00604 
00605 
00606   this->SetLock(kFALSE);
00607   delete fStmt;
00608   fStmt = 0;
00609 
00610 }

Here is the call graph for this function:

Member Function Documentation

Bool_t TDbiCascader::Lock::IsLocked ( ) const [inline]

Definition at line 139 of file TDbiCascader.hxx.

References fLocked.

Referenced by TDbiCascader::ReserveNextSeqNo().

00139 { return fLocked; }

Here is the caller graph for this function:

void TDbiCascader::Lock::SetLock ( Bool_t setting = kTRUE ) [private]

   
     Purpose:  Set or clear lock.
   
     Arguments:
       setting      in    Required setting of lock. [default kTRUE]
   
     Program Notes:-
     =============
   
     No-op if locked otherwise use the LOCK TABLES command.

Definition at line 626 of file TDbiCascader.cxx.

References TDbiStatement::ExecuteUpdate(), fDataTableName, fLocked, fSeqnoTableName, fStmt, TDbiStatement::GetExceptionLog(), TDbiExceptionLog::IsEmpty(), TDbiStatement::PrintExceptions(), and SK_DBI_Log.

Referenced by Lock(), and ~Lock().

00626                                               {
00627 
00628 
00629   if ( setting == fLocked || ! fStmt ) return;
00630 
00631   string sql;
00632 
00633   if ( setting ) {
00634     sql = "LOCK TABLES ";
00635     sql += fSeqnoTableName + " WRITE";
00636     if ( fDataTableName != "" ) sql += ", " + fDataTableName  + "VLD WRITE";
00637   }
00638   else {
00639     sql = "UNLOCK TABLES;";
00640   }
00641   SK_DBI_Log( "Lock requested: " << setting
00642                          << " issuing lock command: " << sql << "  ");
00643   fStmt->ExecuteUpdate(sql.c_str());
00644   if ( fStmt->GetExceptionLog().IsEmpty() ) fLocked = setting;
00645   fStmt->PrintExceptions();
00646 
00647 }