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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 "chunk.h"
#include "request.h"
namespace mongo {
class BatchItemRef;
/**
* Legacy interface for processing client read/write/cmd requests.
*/
class Strategy {
public:
static void queryOp(Request& r);
static void getMore(Request& r);
static void writeOp(int op , Request& r);
struct CommandResult {
ShardId shardTargetId;
ConnectionString target;
BSONObj result;
};
/**
* Executes a command against a particular database, and targets the command based on a
* collection in that database.
*
* This version should be used by internal commands when possible.
*
* TODO: Replace these methods and all other methods of command dispatch with a more general
* command op framework.
*/
static void commandOp(const std::string& db,
const BSONObj& command,
int options,
const std::string& versionedNS,
const BSONObj& targetingQuery,
std::vector<CommandResult>* results);
/**
* Executes a write command against a particular database, and targets the command based on
* a write operation.
*
* Does *not* retry or retarget if the metadata is stale.
*
* Similar to commandOp() above, but the targeting rules are different for writes than for
* reads.
*/
static Status commandOpWrite(const std::string& db,
const BSONObj& command,
BatchItemRef targetingBatchItem,
std::vector<CommandResult>* results);
/**
* Some commands can only be run in a sharded configuration against a namespace that has
* not been sharded. Use this method to execute such commands.
*
* Does *not* retry or retarget if the metadata is stale.
*
* On success, fills in 'shardResult' with output from the namespace's primary shard. This
* output may itself indicate an error status on the shard.
*/
static Status commandOpUnsharded(const std::string& db,
const BSONObj& command,
int options,
const std::string& versionedNS,
CommandResult* shardResult);
/**
* Executes a command represented in the Request on the sharded cluster.
*
* DEPRECATED: should not be used by new code.
*/
static void clientCommandOp( Request& r );
protected:
static bool handleSpecialNamespaces( Request& r , QueryMessage& q );
};
}
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