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// collection_info_cache.cpp
/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/structure/collection_info_cache.h"
#include "mongo/db/d_concurrency.h"
#include "mongo/db/namespace_details.h"
#include "mongo/db/namespace_details-inl.h"
#include "mongo/db/structure/collection.h"
#include "mongo/util/debug_util.h"
#include "mongo/db/storage/index_details.h" // XXX
#include "mongo/db/pdfile.h" // XXX
namespace mongo {
CollectionInfoCache::CollectionInfoCache( Collection* collection )
: _collection( collection ),
_keysComputed( false ),
_qcCacheMutex( "_qcCacheMutex" ),
_qcWriteCount( 0 ) {}
void CollectionInfoCache::reset() {
Lock::assertWriteLocked( _collection->ns().ns() );
clearQueryCache();
_keysComputed = false;
}
void CollectionInfoCache::computeIndexKeys() {
DEV Lock::assertWriteLocked( _collection->ns().ns() );
_indexedPaths.clear();
NamespaceDetails::IndexIterator i = _collection->details()->ii( true );
while( i.more() ) {
BSONObj key = i.next().keyPattern();
BSONObjIterator j( key );
while ( j.more() ) {
BSONElement e = j.next();
_indexedPaths.addPath( e.fieldName() );
}
}
_keysComputed = true;
}
void CollectionInfoCache::notifyOfWriteOp() {
scoped_lock lk( _qcCacheMutex );
if ( _qcCache.empty() )
return;
if ( ++_qcWriteCount >= 100 )
_clearQueryCache_inlock();
}
void CollectionInfoCache::clearQueryCache() {
scoped_lock lk( _qcCacheMutex );
_clearQueryCache_inlock();
}
void CollectionInfoCache::_clearQueryCache_inlock() {
_qcCache.clear();
_qcWriteCount = 0;
}
CachedQueryPlan CollectionInfoCache::cachedQueryPlanForPattern( const QueryPattern &pattern ) {
scoped_lock lk( _qcCacheMutex );
return _qcCache[ pattern ];
}
void CollectionInfoCache::registerCachedQueryPlanForPattern( const QueryPattern &pattern,
const CachedQueryPlan &cachedQueryPlan ) {
scoped_lock lk( _qcCacheMutex );
_qcCache[ pattern ] = cachedQueryPlan;
}
}
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