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//# TableLock.cc: Class to hold table lock options
//# Copyright (C) 1997,2000,2001,2002
//# 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/TableLock.h>
#include <casacore/tables/Tables/TableError.h>
#include <casacore/casa/System/AipsrcValue.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
TableLock::TableLock (LockOption option)
: itsOption (option),
itsReadLocking (True),
itsMaxWait (0),
itsInterval (5),
itsIsDefaultLocking (False),
itsIsDefaultInterval (True)
{
init();
}
TableLock::TableLock (LockOption option, double inspectionInterval,
uInt maxWait)
: itsOption (option),
itsReadLocking (True),
itsMaxWait (maxWait),
itsInterval (inspectionInterval),
itsIsDefaultLocking (False),
itsIsDefaultInterval (False)
{
init();
}
TableLock::TableLock (const TableLock& that)
: itsOption (that.itsOption),
itsReadLocking (that.itsReadLocking),
itsMaxWait (that.itsMaxWait),
itsInterval (that.itsInterval),
itsIsDefaultLocking (that.itsIsDefaultLocking),
itsIsDefaultInterval (that.itsIsDefaultInterval)
{}
TableLock& TableLock::operator= (const TableLock& that)
{
if (this != &that) {
itsOption = that.itsOption;
itsReadLocking = that.itsReadLocking;
itsMaxWait = that.itsMaxWait;
itsInterval = that.itsInterval;
itsIsDefaultLocking = that.itsIsDefaultLocking;
itsIsDefaultInterval = that.itsIsDefaultInterval;
}
return *this;
}
void TableLock::init()
{
#ifdef AIPS_TABLE_NOLOCKING
itsOption = NoLocking;
#else
Bool opt;
AipsrcValue<Bool>::find (opt, "table.nolocking", False);
if (opt) {
itsOption = NoLocking;
} else {
if (itsOption == DefaultLocking) {
itsOption = AutoLocking;
itsIsDefaultLocking = True;
} else if (itsOption == AutoNoReadLocking) {
itsOption = AutoLocking;
itsReadLocking = False;
} else if (itsOption == UserNoReadLocking) {
itsOption = UserLocking;
itsReadLocking = False;
}
}
#endif
if (itsOption == NoLocking) {
itsReadLocking = False;
}
}
void TableLock::merge (const TableLock& that)
{
if (! that.itsIsDefaultLocking) {
if (itsIsDefaultLocking || that.itsOption <= itsOption) {
itsOption = that.itsOption;
itsMaxWait = that.itsMaxWait;
itsIsDefaultLocking = that.itsIsDefaultLocking;
}
if (itsIsDefaultLocking) {
itsReadLocking = that.itsReadLocking;
} else if (that.itsReadLocking) {
itsReadLocking = True;
}
if (! that.itsIsDefaultInterval) {
if (itsIsDefaultInterval || itsInterval > that.itsInterval) {
itsInterval = that.itsInterval;
}
}
}
}
Bool TableLock::lockingDisabled()
{
#ifdef AIPS_TABLE_NOLOCKING
return True;
#else
Bool opt;
AipsrcValue<Bool>::find (opt, "table.nolocking", False);
return opt;
#endif
}
} //# NAMESPACE CASACORE - END
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