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//# TableLocker.cc: Class to hold a (user) lock on a table
//# Copyright (C) 1998,2000,2005
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//# $Id$
#include <casacore/tables/Tables/TableLocker.h>
#include <casacore/tables/Tables/TableError.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
TableLocker::TableLocker (Table& table,
FileLocker::LockType type,
uInt nattempts)
: itsTable (table),
itsHadLock (table.hasLock(type))
{
if (!itsHadLock) {
if (type == FileLocker::Read && !table.lockOptions().readLocking()) {
// Read lock not needed if NoReadLocking.
itsHadLock = True;
} else {
// Acquire the lock.
if (! itsTable.lock (type, nattempts)) {
String str = "write";
if (type == FileLocker::Read) {
str = "read";
}
throw (TableError ("No " + str + " lock could be acquired on table " +
itsTable.tableName()));
}
}
}
}
TableLocker::~TableLocker()
{
if (!itsHadLock) {
itsTable.unlock();
}
}
} //# NAMESPACE CASACORE - END
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