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// strategy.h
/*
* Copyright (C) 2010 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.
*/
#pragma once
#include "mongo/pch.h"
#include "chunk.h"
#include "request.h"
namespace mongo {
class Strategy {
public:
Strategy() {}
virtual ~Strategy() {}
virtual void queryOp( Request& r ) = 0;
virtual void getMore( Request& r ) = 0;
virtual void writeOp( int op , Request& r ) = 0;
void insert( const Shard& shard , const char * ns , const BSONObj& obj , int flags=0 , bool safe=false );
struct CommandResult {
Shard shardTarget;
ConnectionString target;
BSONObj result;
};
virtual void commandOp( const string& db,
const BSONObj& command,
int options,
const string& versionedNS,
const BSONObj& targetingQuery,
vector<CommandResult>* results )
{
// Only call this from sharded, for now.
// TODO: Refactor all this.
verify( false );
}
// These interfaces will merge soon, so make it easy to share logic
friend class ShardStrategy;
friend class SingleStrategy;
protected:
void doWrite( int op , Request& r , const Shard& shard , bool checkVersion = true );
void doIndexQuery( Request& r , const Shard& shard );
void broadcastWrite(int op, Request& r); // Sends to all shards in cluster. DOESN'T CHECK VERSION
void insert( const Shard& shard , const char * ns , const vector<BSONObj>& v , int flags=0 , bool safe=false );
void update( const Shard& shard , const char * ns , const BSONObj& query , const BSONObj& toupdate , int flags=0, bool safe=false );
};
extern Strategy * SINGLE;
extern Strategy * SHARDED;
}
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