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//# TableCache.cc: Cache of open tables
//# Copyright (C) 1994,1995,1997,1999
//# 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/TableCache.h>
#include <casacore/tables/Tables/Table.h>
#include <casacore/tables/Tables/PlainTable.h>
#include <casacore/tables/Tables/TableLock.h>
#include <casacore/tables/Tables/TableError.h>
#include <casacore/casa/Arrays/Vector.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
TableCache::TableCache()
{}
TableCache::~TableCache()
{}
PlainTable* TableCache::operator() (const String& tableName) const
{
std::lock_guard<std::mutex> sc(itsMutex);
return getTable (tableName);
}
PlainTable* TableCache::getTable (const String& tableName) const
{
std::map<String,void*>::const_iterator iter = tableMap_p.find (tableName);
if (iter == tableMap_p.end()) {
return 0;
}
return static_cast<PlainTable*>(iter->second);
}
void TableCache::define (const String& tableName, PlainTable* tab)
{
std::lock_guard<std::mutex> sc(itsMutex);
tableMap_p.insert (std::make_pair(tableName, tab));
}
void TableCache::remove (const String& tableName)
{
// For static Table objects it is possible that the cache is
// deleted before the Table.
// Therefore do not delete if the map is already empty
// (otherwise an exception is thrown).
std::lock_guard<std::mutex> sc(itsMutex);
if (tableMap_p.size() > 0) {
try {
tableMap_p.erase (tableName);
} catch (std::exception&) {
// Something strange has happened.
// Throwing an exception causes an immediate crash (probably by
// Table destructors).
// So write a message on stderr;
std::cerr << "Cannot remove table " << tableName
<< " from the table cache; suggest restarting" << std::endl;
}
}
}
void TableCache::rename (const String& newName, const String& oldName)
{
std::lock_guard<std::mutex> sc(itsMutex);
if (tableMap_p.find (oldName) != tableMap_p.end()) {
void* ptr = tableMap_p.at(oldName);
tableMap_p.erase (oldName);
tableMap_p.insert (std::make_pair(newName, ptr));
}
}
uInt TableCache::nAutoLocks()
{
std::lock_guard<std::mutex> sc(itsMutex);
uInt n=0;
for (const auto& x : tableMap_p) {
PlainTable& table = *static_cast<PlainTable*>(x.second);
if (table.lockOptions().option() == TableLock::AutoLocking) {
//# Having a read lock is enough.
if (table.hasLock (FileLocker::Read)) {
n++;
}
}
}
return n;
}
void TableCache::relinquishAutoLocks (Bool all)
{
std::lock_guard<std::mutex> sc(itsMutex);
for (const auto& x : tableMap_p) {
PlainTable& table = *static_cast<PlainTable*>(x.second);
if (table.lockOptions().option() == TableLock::AutoLocking) {
//# Having a read lock is enough.
if (table.hasLock (FileLocker::Read)) {
if (all) {
table.unlock();
}else{
table.autoReleaseLock (True);
}
}
}
}
}
Vector<String> TableCache::getTableNames() const
{
std::lock_guard<std::mutex> sc(itsMutex);
uInt ntab = tableMap_p.size();
Vector<String> names(ntab);
ntab = 0;
for (const auto& x : tableMap_p) {
PlainTable& table = *static_cast<PlainTable*>(x.second);
names[ntab++] = table.tableName();
}
return names;
}
Vector<String> TableCache::getLockedTables (FileLocker::LockType lockType,
int lockOption)
{
std::lock_guard<std::mutex> sc(itsMutex);
vector<String> names;
for (const auto& x : tableMap_p) {
PlainTable& table = *static_cast<PlainTable*>(x.second);
if (lockOption < 0 || table.lockOptions().option() == lockOption) {
if (table.hasLock (lockType)) {
names.push_back (table.tableName());
}
}
}
return Vector<String>(names);
}
void TableCache::flushTable (const String& name,
Bool fsync, Bool recursive)
{
std::lock_guard<std::mutex> sc(itsMutex);
PlainTable* tab = getTable(name);
if (tab) {
tab->flush (fsync, recursive);
}
}
PlainTable* TableCache::lookCache (const String& name, int tableOption,
const TableLock& lockOptions)
{
//# Exit if table is not in cache yet.
PlainTable* btp = this->operator()(name);
if (btp == 0) {
return btp;
}
//# Check if option matches. It does if equal.
//# Otherwise it does if option in cached table is "more".
//# Note that class PlainTable already throws an exception if
//# a new table is created with the same name as an open table.
int cachedTableOption = btp->tableOption();
if ((tableOption == cachedTableOption)
|| ((cachedTableOption == Table::New
|| cachedTableOption == Table::NewNoReplace
|| cachedTableOption == Table::Update)
&& (tableOption == Table::Update
|| tableOption == Table::Old))) {
btp->mergeLock (lockOptions);
return btp;
}
if (cachedTableOption == Table::Old && tableOption == Table::Update) {
btp->mergeLock (lockOptions);
btp->reopenRW();
return btp;
}
throw (TableInvOper ("Table " + name +
" cannot be opened/created (already in cache)"));
}
} //# NAMESPACE CASACORE - END
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