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// wiredtiger_size_storer.h
/**
* Copyright (C) 2014 MongoDB 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.
*/
#pragma once
#include <map>
#include <string>
#include <wiredtiger.h>
#include "mongo/base/string_data.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_session_cache.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
class WiredTigerRecordStore;
class WiredTigerSession;
class WiredTigerSizeStorer {
public:
WiredTigerSizeStorer(WT_CONNECTION* conn, const std::string& storageUri);
~WiredTigerSizeStorer();
void onCreate(WiredTigerRecordStore* rs, long long nr, long long ds);
void onDestroy(WiredTigerRecordStore* rs);
void storeToCache(StringData uri, long long numRecords, long long dataSize);
void loadFromCache(StringData uri, long long* numRecords, long long* dataSize) const;
/**
* Loads from the underlying table.
*/
void fillCache();
/**
* Writes all changes to the underlying table.
*/
void syncCache(bool syncToDisk);
private:
void _checkMagic() const;
struct Entry {
Entry() : numRecords(0), dataSize(0), dirty(false), rs(NULL) {}
long long numRecords;
long long dataSize;
bool dirty;
WiredTigerRecordStore* rs; // not owned
};
int _magic;
// Guards _cursor. Acquire *before* _entriesMutex.
mutable stdx::mutex _cursorMutex;
const WiredTigerSession _session;
WT_CURSOR* _cursor; // pointer is const after constructor
typedef std::map<std::string, Entry> Map;
Map _entries;
mutable stdx::mutex _entriesMutex;
};
}
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